42 results on '"Li, Fang-Li"'
Search Results
2. Holographic Einstein rings of a black hole with a global monopole
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Xiao-Xiong Zeng, Li-Fang Li, and Peng Xu
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Astrophysics ,QB460-466 ,Nuclear and particle physics. Atomic energy. Radioactivity ,QC770-798 - Abstract
Abstract The global monopole solutions which give rise to quite unusual physical phenomena have captured considerable attention. In this paper, we study the Einstein ring of the spherically symmetric AdS black hole solution with a global monopole based on the AdS/CFT correspondence. With the help of the given response function of the QFT on the boundary, we construct the holographic images of the black hole in the bulk. Our results exhibit the absolute amplitude of total response function $$|\langle \mathcal {O}\rangle |$$ | ⟨ O ⟩ | increases with the decrease of the monopole parameter b and the temperature T. And the frequency $$\omega $$ ω of the Gaussian source will also increase the absolute amplitude. These parameters also affects the Einstein ring. With the change of the observation position, this ring will change from the concentric stripe to a luminosity-deformed ring, or light points. And the monopole parameter has an effect on the brightness and the position of Einstein ring. All these results imply that the holographic images can be used as an effective tool to distinguish different types of black holes for fixed wave source and optical system. These theoretical proposal opens a door to gravitational phenomena on strongly correlated material. Therefore, the holographic Einstein ring is of great theoretical and experimental significance for our research. In theory, it provides us a new way to find a necessary condition for the existence of the dual black hole. And experimentally speaking, if we can realize suitable targets for observing AdS black holes successfully, we would be able to observe Einstein rings by tabletop experiments when we apply localized sources on such materials and measure their responses.
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- 2024
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3. Holographic Einstein rings of non-commutative black holes
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Xin-Yun Hu, Xiao-Xiong Zeng, Li-Fang Li, and Peng Xu
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Astrophysics ,QB460-466 ,Nuclear and particle physics. Atomic energy. Radioactivity ,QC770-798 - Abstract
Abstract With the help of AdS/CFT correspondence, we derive the desired response function of QFT on the boundary of the non-commutative black hole. Using the virtual optical system with a convex lens, we obtain the Einstein rings of the black hole from the response function. All the results show that the holographic ring always appears with the concentric stripe when the observer located at the north pole. With the change of the observation position, the ring changes into a luminosity-deformed ring, or bright spot. We also investigate the effect of the non-commutative parameter on the ring and find the ring radius becomes larger as the parameter increases. The effect of the temperature on the ring radius is also investigated, it is found that the higher the temperature, the smaller the ring radius. In addition, we also obtain the ingoing angle of the photon via geometric optics, as expected, this angle is consistent well with the angle of the Einstein ring obtained via holography.
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- 2024
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4. Holographic study on Einstein ring for a charged black hole in conformal gravity
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Xin-Yun Hu, Xiao-Xiong Zeng, Li-Fang Li, and Peng Xu
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AdS/CFT correspondence ,Holographic dual ,Holographic Einstein ring ,Physics ,QC1-999 - Abstract
Under the help of AdS/CFT correspondence, the Einstein ring of a charged black hole in conformal gravity has been studied. As an alternative to standard Einstein’s theory, the conformal gravity is both renormalizable and unitary. And such conformal theory can naturally solve some troublesome problems in physics, such as the quantum gravity problem, the dark matter problem and so on. Considering the conformal gravity has many advantages, therefore in this paper, we study Einstein ring and the effect of gravity-related parameters c0, temperature T and chemical potential u on such Einstein ring in the conformal gravity through the holographic method. Explicitly, imposing an oscillating Gauss source on one side of the AdS boundary which propagates in the bulk, the response functions are derived on the other side of the boundary. Given the proposed wave optics system, the Einstein rings are observed as expected. All these results reveal that when the observer locates at the north pole, there always exists the Einstein ring and surrounding concentric stripes. And such ring becomes into a luminosity-deformed ring or light spot while the observer departs away from the north pole. We also investigate the effect of temperature T, chemical potential u and gravity-related parameters c0 on the ring radius. We find the ring radius increases with the decrease of the temperature, increase of the chemical potential, and increase of the gravity-related parameters respectively. And more, in conformal gravity, because the charge does not appear in the metric but is given by the constraint relation, the chemical potential affects the radius of the ring differently compared with that in Einstein’s gravity. To check the results in the framework of holography, we investigate the ingoing angle of photon at the photon ring via geometric optics and find it is consistent with the angle of Einstein ring obtained via holography.
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- 2024
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5. A segmentation model to detect cevical lesions based on machine learning of colposcopic images
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Zhen Li, Chu-Mei Zeng, Yan-Gang Dong, Ying Cao, Li-Yao Yu, Hui-Ying Liu, Xun Tian, Rui Tian, Chao-Yue Zhong, Ting-Ting Zhao, Jia-Shuo Liu, Ye Chen, Li-Fang Li, Zhe-Ying Huang, Yu-Yan Wang, Zheng Hu, Jingjing Zhang, Jiu-Xing Liang, Ping Zhou, and Yi-Qin Lu
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HSIL ,Colposcopy ,Diagnosis ,Segmentation ,Artificial intelligence ,Science (General) ,Q1-390 ,Social sciences (General) ,H1-99 - Abstract
Background: Semantic segmentation is crucial in medical image diagnosis. Traditional deep convolutional neural networks excel in image classification and object detection but fall short in segmentation tasks. Enhancing the accuracy and efficiency of detecting high-level cervical lesions and invasive cancer poses a primary challenge in segmentation model development. Methods: Between 2018 and 2022, we retrospectively studied a total of 777 patients, comprising 339 patients with high-level cervical lesions and 313 patients with microinvasive or invasive cervical cancer. Overall, 1554 colposcopic images were put into the DeepLabv3+ model for learning. Accuracy, Precision, Specificity, and mIoU were employed to evaluate the performance of the model in the prediction of cervical high-level lesions and cancer. Results: Experiments showed that our segmentation model had better diagnosis efficiency than colposcopic experts and other artificial intelligence models, and reached Accuracy of 93.29 %, Precision of 87.2 %, Specificity of 90.1 %, and mIoU of 80.27 %, respectively. Conclution: The DeepLabv3+ model had good performance in the segmentation of cervical lesions in colposcopic post-acetic-acid images and can better assist colposcopists in improving the diagnosis.
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- 2023
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6. Efficacy of the feedback teaching method on the compliance of tumor patients in preventing falls
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Li-Fang Li, Xiao-Yan Zhao, Yue-Jie Chen, and Mei Ji
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Surgery ,RD1-811 - Published
- 2022
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7. Quantifying Event‐Specific Radial Diffusion Coefficients of Radiation Belt Electrons With the PPMLR‐MHD Simulation
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Li‐Fang Li, Weichao Tu, Lei Dai, Bin‐Bin Tang, Chi Wang, Mohammad Barani, Gang Zeng, Chao Wei, and J.L. Burch
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- 2020
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8. Holographic Van der Waals-like phase transition in the Gauss–Bonnet gravity
- Author
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Song He, Li-Fang Li, and Xiao-Xiong Zeng
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Nuclear and particle physics. Atomic energy. Radioactivity ,QC770-798 - Abstract
The Van der Waals-like phase transition is observed in temperature–thermal entropy plane in spherically symmetric charged Gauss–Bonnet–AdS black hole background. In terms of AdS/CFT, the non-local observables such as holographic entanglement entropy, Wilson loop, and two point correlation function of very heavy operators in the field theory dual to spherically symmetric charged Gauss–Bonnet–AdS black hole have been investigated. All of them exhibit the Van der Waals-like phase transition for a fixed charge parameter or Gauss–Bonnet parameter in such gravity background. Further, with choosing various values of charge or Gauss–Bonnet parameter, the equal area law and the critical exponent of the heat capacity are found to be consistent with phase structures in temperature–thermal entropy plane.
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- 2017
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9. Van der Waals phase transition in the framework of holography
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Xiao-Xiong Zeng and Li-Fang Li
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Physics ,QC1-999 - Abstract
Phase structure of the quintessence Reissner–Nordström–AdS black hole is probed by the nonlocal observables such as holographic entanglement entropy and two point correlation function. Our result shows that, as the case of the thermal entropy, both the observables exhibit the Van der Waals-like phase transition. To reinforce this conclusion, we further check the equal area law for the first order phase transition and critical exponent of the heat capacity for the second order phase transition. We also discuss the effect of the state parameter on the phase structure of the nonlocal observables.
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- 2017
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10. Phase transition of holographic entanglement entropy in massive gravity
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Xiao-Xiong Zeng, Hongbao Zhang, and Li-Fang Li
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Physics ,QC1-999 - Abstract
The phase structure of holographic entanglement entropy is studied in massive gravity for the quantum systems with finite and infinite volumes, which in the bulk is dual to calculating the minimal surface area for a black hole and black brane respectively. In the entanglement entropy–temperature plane, we find for both the black hole and black brane there is a Van der Waals-like phase transition as the case in thermal entropy–temperature plane. That is, there is a first order phase transition for the small charge and a second order phase transition at the critical charge. For the first order phase transition, the equal area law is checked and for the second order phase transition, the critical exponent of the heat capacity is obtained. All the results show that the phase structure of holographic entanglement entropy is the same as that of thermal entropy regardless of the volume of the spacetime on the boundary.
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- 2016
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11. LAMOST medium-resolution spectroscopic survey of binarity and exotic star (LAMOST-MRS-B): Observation strategy and target selection
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Jiao Li, Jiang-Dan Li, Yan-Jun Guo, Zhan-Wen Han, Xue-Fei Chen, Chao Liu, Hong-Wei Ge, Deng-Kai Jiang, Li-Fang Li, Bo Zhang, Jia-Ming Liu, Hao Tian, Hao-Tong Zhang, Hai-Long Yuan, Wen-Yuan Cui, Juan-Juan Ren, Jing-Hao Cai, and Jian-Rong Shi
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Astrophysics - Solar and Stellar Astrophysics ,General Physics and Astronomy ,FOS: Physical sciences ,Solar and Stellar Astrophysics (astro-ph.SR) - Abstract
LAMOST-MRS-B is one of the sub-surveys of LAMOST medium-resolution (R ∼ 7500) spectroscopic survey. It aims at studying the statistical properties (e.g., binary fraction, orbital period distribution, mass ratio distribution) of binary stars and exotic stars. We intend to observe about 30000 stars (10 mag ≤ G < 14.5 mag) with at least 10 visits in five years. We first planned to observe 25 plates around the galactic plane in 2018. Then the plates were reduced to 12 in 2019 because of the limitation of observation. At the same time, two new plates located at the high galactic latitude were added to explore binary properties influenced by the different environments. In this survey project, we set the identified exotic and low-metallicity stars with the highest observation priorities. For the rest of the selected stars, we gave the higher priority to the relatively brighter stars in order to obtain high quality spectra as many as possible. Spectra of 49129 stars have been obtained in LAMOST-MRS-B field and released in DR8, of which 28828 and 3375 stars have been visited more than twice and ten times with SNR ≥ 10, respectively. Most of the sources are B-, A-, and F-type stars with –0.6 < [Fe/H] < 0.4 dex. We also obtain 347 identified variable and exotic stars and about 250 stars with [Fe/H] < –1 dex. We measure radial velocities (RVs) by using 892233 spectra of the stars. The uncertainties of RV achieve about 1 km ⋅ s−1 and 10 km ⋅ s−1 for 95% of late- and early-type stars, respectively. The datasets presented in this paper are available at http://www.doi.org/10.57760/sciencedb.j00113.00035.
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- 2022
12. Entanglement entropy in a holographic p-wave superconductor model
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Li-Fang Li, Rong-Gen Cai, Li Li, and Chao Shen
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Nuclear and particle physics. Atomic energy. Radioactivity ,QC770-798 - Abstract
In a recent paper, arXiv:1309.4877, a holographic p-wave model has been proposed in an Einstein–Maxwell-complex vector field theory with a negative cosmological constant. The model exhibits rich phase structure depending on the mass and the charge of the vector field. We investigate the behavior of the entanglement entropy of dual field theory in this model. When the above two model parameters change, we observe the second order, first order and zeroth order phase transitions from the behavior of the entanglement entropy at some intermediate temperatures. These imply that the entanglement entropy can indicate not only the occurrence of the phase transition, but also the order of the phase transition. The entanglement entropy is indeed a good probe to phase transition. Furthermore, the “retrograde condensation” which is a sub-dominated phase is also reflected on the entanglement entropy.
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- 2015
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13. Holographic Phase Transition Probed by Nonlocal Observables
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Xiao-Xiong Zeng and Li-Fang Li
- Subjects
Physics ,QC1-999 - Abstract
From the viewpoint of holography, the phase structure of a 5-dimensional Reissner-Nordström-AdS black hole is probed by the two-point correlation function, Wilson loop, and entanglement entropy. As the case of thermal entropy, we find for all the probes that the black hole undergoes a Hawking-Page phase transition, a first-order phase transition, and a second-order phase transition successively before it reaches a stable phase. In addition, for these probes, we find that the equal area law for the first-order phase transition is valid always and the critical exponent of the heat capacity for the second-order phase transition coincides with that of the mean field theory regardless of the size of the boundary region.
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- 2016
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14. Kuwanon G protects HT22 cells from advanced glycation end product-induced damage
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Wen-Qian Zhang, Hua Zhou, Tingting Zhao, Wen-Jun Gan, Junling Gu, Youhua Xu, Heng-Li Guo, Li-Fang Li, Ding-Kun Gui, Li-Li Yu, Yong Xu, and Chenlin Gao
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Kuwanon G ,Cancer Research ,medicine.medical_specialty ,Population ,Superoxide dismutase ,chemistry.chemical_compound ,Immunology and Microbiology (miscellaneous) ,Glycation ,Internal medicine ,medicine ,education ,Protein kinase B ,PI3K/AKT/mTOR pathway ,chemistry.chemical_classification ,Reactive oxygen species ,education.field_of_study ,biology ,diabetes ,Chemistry ,Glutathione peroxidase ,advanced glycation end products ,General Medicine ,Articles ,encephalopathy ,acetylcholine ,Endocrinology ,biology.protein ,Advanced glycation end-product - Abstract
The incidence of diabetic encephalopathy is increasing as the population ages. Evidence suggests that formation and accumulation of advanced glycation end products (AGEs) plays a pivotal role in disease progression, but limited research has been carried out in this area. A previous study demonstrated that Kuwanon G (KWG) had significant anti-oxidative stress and anti-inflammatory properties. As AGEs are oxidative products and inflammation is involved in their generation it is hypothesized that KWG may have effects against AGE-induced neuronal damage. In the present study, mouse hippocampal neuronal cell line HT22 was used. KWG was shown to significantly inhibit AGE-induced cell apoptosis in comparison with a control treatment, as determined by both MTT and flow cytometry. Compared with the AGEs group, expression of pro-apoptotic protein Bax was reduced and expression of anti-apoptotic protein Bcl-2 was increased in the AGEs + KWG group. Both intracellular and extracellular levels of acetylcholine and choline acetyltransferase were significantly elevated after KWG administration in comparison with controls whilethe level of acetylcholinesterase decreased. These changes in protein expression were accompanied by increased levels of superoxide dismutase and glutathione peroxidase synthesis and reduced production of malondialdehyde and reactive oxygen species. Intracellular signaling pathway protein levels were determined by western blot and immunocytochemistry. KWG administration was found to prevent AGE-induced changes to the phosphorylation levels of Akt, IκB-α, glycogen synthase kinase 3 (GSK3)-α and β, p38 MAPK and NF-κB p65 suggesting a potential neuroprotective effect of KWG against AGE-induced damage was via the PI3K/Akt/GSK3αβ signaling pathway. The findings of the present study suggest that KWG may be a potential treatment for diabetic encephalopathy.
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- 2021
15. Thermodynamics in Loop Quantum Cosmology
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Li-Fang Li and Jian-Yang Zhu
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Physics ,QC1-999 - Abstract
Loop quantum cosmology (LQC) is very powerful to deal with the behavior of early universe. Moreover, the effective loop quantum cosmology gives a successful description of the universe in the semiclassical region. We consider the apparent horizon of the Friedmann-Robertson-Walker universe as a thermodynamical system and investigate the thermodynamics of LQC in the semiclassical region. The effective density and effective pressure in the modified Friedmann equation from LQC not only determine the evolution of the universe in LQC scenario but also are actually found to be the thermodynamic quantities. This result comes from the energy definition in cosmology (the Misner-Sharp gravitational energy) and is consistent with thermodynamic laws. We prove that within the framework of loop quantum cosmology, the elementary equation of equilibrium thermodynamics is still valid.
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- 2009
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16. Binary black hole mergers inf(R)theory
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Zhoujian Cao, Pablo Galaviz, and Li-Fang Li
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- 2013
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17. Effects of the health belief model following acute exacerbation of chronic obstructive pulmonary disease in a hospital in China
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Li-Fang Li, Mei Ji, Chen Yu, Chun-Mei Chen, Ai-Hong Wang, Ya-Hui Shen, and Jun Ye
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Pulmonary and Respiratory Medicine ,medicine.medical_specialty ,Acute exacerbation of chronic obstructive pulmonary disease ,Symptom management ,business.industry ,Multidimensional Fatigue Inventory ,After discharge ,medicine.disease ,03 medical and health sciences ,0302 clinical medicine ,030228 respiratory system ,Internal medicine ,medicine ,Health belief model ,Anxiety ,Original Article ,030212 general & internal medicine ,medicine.symptom ,business ,Anxiety scale - Abstract
BACKGROUND: This study aims to investigate the effects of education with health belief model (HBM) on anxiety and fatigue among patients with acute exacerbation of chronic obstructive pulmonary disease (AECOPD). METHODS: Patients with AECOPD admitted into Taizhou People’s Hospital, Jiangsu, China between December 2012 and October 2013 were randomly selected for the present study according to random number table. A total of 99 cases with anxiety were included. These patients were divided into two groups: experimental group educated by HBM (n=47), and control group educated by conventional method (n=52). The scores for anxiety and fatigue were evaluated using the self-rating anxiety scale (SAS) and multidimensional fatigue inventory (MFI-20). RESULTS: After educational intervention by HBM, patients achieved a significant decrease in anxiety and fatigue scores, when compared to patients in the control group, who were educated by the conventional method at the time of admission, discharge, and 6 weeks after discharge (P
- Published
- 2019
18. A photometric study of the high-mass-ratio contact binary AV Puppis
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Dengkai Jiang, Li-Fang Li, and Quan-Wang Han
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Physics ,010308 nuclear & particles physics ,FOS: Physical sciences ,Astronomy and Astrophysics ,Contact binary ,Astrophysics ,Mass ratio ,Light curve ,Orbital period ,01 natural sciences ,Astrophysics - Solar and Stellar Astrophysics ,Space and Planetary Science ,Mass transfer ,0103 physical sciences ,High mass ,010303 astronomy & astrophysics ,Solar and Stellar Astrophysics (astro-ph.SR) - Abstract
The multi-color photometric light curves for a contact binary AV Puppis (AV Pup) in $VR_cI_c$ bandpasses are presented, and they are analyzed by using of the 2013 version of the Wilson-Devinney (W-D) code. The solutions suggest that AV Pup is a peculiar A-subtype W UMa contact binary with a high mass ratio ($q=m_2/m_1= 0.896$) and a fill-out factor ($f=10\%$). Combining with our newly determined times of minimum with those collected from literatures, the orbital period changes of this system are investigated. The $O-C$ analysis shows that the orbital period of AV Pup is increasing at a rate of $\mathrm{d}P/\mathrm{d}t=4.83 \times 10^{-7} \ \mathrm{days \ yr^{-1}}$, which can be explained by mass transfer from the less massive component to the more massive one., 9 pages, 4 figures
- Published
- 2019
19. Van der Waals phase transition in the framework of holography
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Li-Fang Li and Xiao-Xiong Zeng
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Physics ,High Energy Physics - Theory ,Phase transition ,Nuclear and High Energy Physics ,010308 nuclear & particles physics ,Critical phenomena ,FOS: Physical sciences ,Quantum entanglement ,General Relativity and Quantum Cosmology (gr-qc) ,01 natural sciences ,General Relativity and Quantum Cosmology ,lcsh:QC1-999 ,symbols.namesake ,Correlation function ,High Energy Physics - Theory (hep-th) ,Quantum mechanics ,0103 physical sciences ,symbols ,van der Waals force ,010306 general physics ,Entropy (arrow of time) ,Critical exponent ,lcsh:Physics ,Quintessence - Abstract
Phase structure of the quintessence Reissner-Nordstr\"{o}m-AdS black hole is probed with the nonlocal observables such as holographic entanglement entropy and two point correlation function. Our result shows that, as the case of the thermal entropy, both the observables exhibit the similar Van der Waals-like phase transition. To reinforce the conclusion, we further check the equal area law for the first order phase transition and critical exponent of the heat capacity for the second order phase transition. We also discuss the effect of the state parameter on the phase structure of the nonlocal observables., Comment: 16 pages, 6 figures. arXiv admin note: text overlap with arXiv:1511.00383
- Published
- 2016
20. Phase structure of the Born–Infeld–anti-de Sitter black holes probed by non-local observables
- Author
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Xiao-Xiong Zeng, Li-Fang Li, and Xian-Ming Liu
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High Energy Physics - Theory ,Physics ,Phase transition ,Physics and Astronomy (miscellaneous) ,010308 nuclear & particles physics ,Critical phenomena ,FOS: Physical sciences ,General Relativity and Quantum Cosmology (gr-qc) ,01 natural sciences ,General Relativity and Quantum Cosmology ,Black hole ,symbols.namesake ,High Energy Physics - Theory (hep-th) ,Correlation function ,Quantum mechanics ,0103 physical sciences ,symbols ,Anti-de Sitter space ,van der Waals force ,010306 general physics ,Engineering (miscellaneous) ,Critical exponent ,Phase diagram - Abstract
With the non-local observables such as two point correlation function and holographic entanglement entropy, we probe the phase structure of the Born-Infeld-anti-de Sitter black holes. We find for the case $bQ>0.5$, the phase structure is similar to that of the Reissner-Nordstr��m-AdS black hole, namely the black hole undergoes a Hawking-Page phase transition, a first order phase transition, and a second order phase transition. While for the case $bQ, 20 pages, many figures. arXiv admin note: text overlap with arXiv:1512.08855
- Published
- 2016
21. Holographic Van der Waals-like phase transition in the Gauss-Bonnet gravity
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Xiao-Xiong Zeng, Song He, and Li-Fang Li
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Physics ,High Energy Physics - Theory ,Nuclear and High Energy Physics ,Phase transition ,Wilson loop ,010308 nuclear & particles physics ,Critical phenomena ,FOS: Physical sciences ,General Relativity and Quantum Cosmology (gr-qc) ,01 natural sciences ,General Relativity and Quantum Cosmology ,AdS/CFT correspondence ,symbols.namesake ,Correlation function ,High Energy Physics - Theory (hep-th) ,Gauss–Bonnet gravity ,Quantum mechanics ,0103 physical sciences ,symbols ,lcsh:QC770-798 ,lcsh:Nuclear and particle physics. Atomic energy. Radioactivity ,van der Waals force ,010306 general physics ,Critical exponent - Abstract
The Van der Waals-like phase transition is observed in temperature-thermal entropy plane in spherically symmetric charged Gauss-Bonnet-AdS black hole background. In terms of AdS/CFT, the non-local observables such as holographic entanglement entropy, Wilson loop, and two point correlation function of very heavy operators in the field theory dual to spherically symmetric charged Gauss-Bonnet-AdS black hole have been investigated. All of them exhibit the Van der Waals-like phase transition for a fixed charge parameter or Gauss-Bonnet parameter in such gravity background. Further, with choosing various values of charge or Gauss-Bonnet parameter, the equal area law and the critical exponent of the heat capacity are found to be consistent with phase structures in temperature-thermal entropy plane., Some statements about the analogy between the black hole phase transition in $T-S$ plane and Van der Waals-like phase transition in $P-V$ plane are added. This is the published version
- Published
- 2016
22. Introduction to Holographic Superconductor Models
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Li-Fang Li, Rong-Gen Cai, Run-Qiu Yang, and Li Li
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Superconductivity ,Strongly coupled ,Physics ,High Energy Physics - Theory ,010308 nuclear & particles physics ,General relativity ,Holography ,General Physics and Astronomy ,FOS: Physical sciences ,01 natural sciences ,law.invention ,Theoretical physics ,Dimension (vector space) ,High Energy Physics - Theory (hep-th) ,law ,Condensed Matter::Superconductivity ,0103 physical sciences ,Point (geometry) ,010306 general physics - Abstract
In the last years it has been shown that some properties of strongly coupled superconductors can be potentially described by classical general relativity living in one higher dimension, which is known as holographic superconductors. This paper gives a quick and introductory overview of some holographic superconductor models with s-wave, p-wave and d-wave orders in the literature from point of view of bottom-up, and summarizes some basic properties of these holographic models in various regimes. The competition and coexistence of these superconductivity orders are also studied in these superconductor models., 93 pages, 38 figures, 2 tables; v3: misprints corrected, published version. arXiv admin note: text overlap with arXiv:1309.5086, arXiv:1007.1981 by other authors
- Published
- 2015
23. Competition between s-wave order and d-wave order in holographic superconductors
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Rong-Gen Cai, Yong-Qiang Wang, Li Li, and Li-Fang Li
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Superconductivity ,Physics ,High Energy Physics - Theory ,Nuclear and High Energy Physics ,Condensed matter physics ,Holography ,FOS: Physical sciences ,law.invention ,Competition (economics) ,High Energy Physics - Theory (hep-th) ,law ,Phase (matter) ,S-wave ,Order (group theory) ,Phase diagram - Abstract
We study competition between s-wave order and d-wave order through two holographic superconductor models. We find that once the coexisting phase appears, it is always thermodynamically favored, and that the coexistence phase is narrow and one condensate tends to kill the other. The phase diagram is constructed for each model in terms of temperature and the ratio of charges of two orders. We further compare the behaviors of some thermodynamic quantities, and discuss the different aspects and identical ones between two models., Comment: 3 figures added, accepted by JHEP
- Published
- 2014
24. Towards complete phase diagrams of a holographic p-wave superconductor model
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Li-Fang Li, Li Li, Rong-Gen Cai, and Run-Qiu Yang
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Physics ,Superconductivity ,High Energy Physics - Theory ,Phase transition ,Nuclear and High Energy Physics ,Condensed Matter - Superconductivity ,Phase (waves) ,FOS: Physical sciences ,General Relativity and Quantum Cosmology (gr-qc) ,Cosmological constant ,General Relativity and Quantum Cosmology ,Superconductivity (cond-mat.supr-con) ,Black hole ,High Energy Physics - Theory (hep-th) ,Quantum mechanics ,Vector field ,Soliton ,Phase diagram - Abstract
We study in detail the phase structure of a holographic p-wave superconductor model in a five dimensional Einstein-Maxwell-complex vector field theory with a negative cosmological constant. To construct complete phase diagrams of the model, we consider both the soliton and black hole backgrounds. In both two cases, there exist second order, first order and zeroth order phase transitions, and the so-called "retrograde condensation" also happens. In particular, in the soliton case with the mass of the vector field being beyond a certain critical value, we find a series of phase transitions happen such as "insulator/superconductor/insulator/superconductor", as the chemical potential continuously increases. We construct complete phase diagrams in terms of temperature and chemical potential and find some new phase boundaries., 47 pages, 25 figures, added references, modified some figures
- Published
- 2014
25. Non-Gaussian features from the inverse volume corrections in loop quantum cosmology
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Li-Fang Li, Zong-Kuan Guo, Rong-Gen Cai, and Bin Hu
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Physics ,High Energy Physics - Theory ,Nuclear and High Energy Physics ,Cosmology and Nongalactic Astrophysics (astro-ph.CO) ,Primordial fluctuations ,Gaussian ,Scalar (mathematics) ,Cosmic microwave background ,FOS: Physical sciences ,General Relativity and Quantum Cosmology (gr-qc) ,Astrophysics::Cosmology and Extragalactic Astrophysics ,General Relativity and Quantum Cosmology ,symbols.namesake ,High Energy Physics - Theory (hep-th) ,Quantum mechanics ,symbols ,Statistical physics ,Bispectrum ,Quantum ,Black hole thermodynamics ,Loop quantum cosmology ,Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
In this paper we study the non-Gaussian features of the primordial fluctuations in loop quantum cosmology with the inverse volume corrections. The detailed analysis is performed in the single field slow-roll inflationary models. However, our results reflect the universal characteristics of bispectrum in loop quantum cosmology. The main corrections to the scalar bispectrum come from two aspects: one is the modifications to the standard Bunch-Davies vacuum, the other is the corrections to the background dependent variables, such as slow-roll parameters. Our calculations show that the loop quantum corrections make $f_{{\rm NL}}$ of the inflationary models increase 0.1%. Moreover, we find that two new shapes arise, namely $\mathcal F_{1}$ and $\mathcal F_{2}$. The former gives a unique loop quantum feature which is less correlated with the local, equilateral and single types, while the latter is highly correlated with the local one., Comment: matched to the published version. 30 pages, 4 figures
- Published
- 2011
26. Loop Quantum Cosmology: Effective Theory and Related Applications
- Author
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Kui Xiao, Li-Fang Li, and Jian-Yang Zhu
- Subjects
Physics ,Open quantum system ,Theoretical physics ,Quantum cosmology ,General relativity ,Quantum mechanics ,Quantum gravity ,Loop quantum gravity ,Canonical quantum gravity ,String theory ,Loop quantum cosmology - Abstract
The effort toward making quantum mechanics and general relativity compatible (quantum gravity) has lasted more than a century. The string theory and loop quantum gravity both stand out as strong candidates and currently they both make popular research subjects in quantum gravity. As we known, Loop quantum gravity (LQG)(Ashtekar & Lewandowski, 2004; Rovelli, 1998; 2004; Thiemann, 2007) is a background independent and non-perturbative canonical quantum gravity theory. LQG has made many breakthroughs in recent years: the establishment of the quantum Einstein equations Ashtekar & Tate (1994); Ashtekar et al. (1995a); Corichi & Zapata (1997); Lewandowshi & Thiemann (1999); Rovelli & Smolin (1994); Thiemann (1996; 1998a;b;c; 2001), the proof that the Riemannian operators have discrete eigenvalues Ashtekar et al. (1995b); Lewandowski (1997); Loll (1995a;b; 1997a;b); Rovilli & Smolin (1995); Thiemann (1998d;e),results concerning the entropy of the black hole horizon and cosmological horizon entropy with statistical mechanics Ashtekar et al. (1998; 1999; 2000; 2001; 2002; 2003a;b); Berreira et al. (1996); Rovelli (1996a;b); Smolin (1995), and so on. As an application of loop quantum gravity to cosmology, loop quantum cosmology (LQC) Bojowald (2005a; 2008); Date (2002) also presents itself as a possible path toward answers to the cosmological and astrophysical riddles. As a symmetry reduced model of LQG, LQC inherits the quantum schemes originated from LQG that dealt with the isotropic and homogeneous universe firstly and then extended to the inhomogeneous and anisotropic model Bojowald (2002a). It plays an important role in connecting the LQG theory and the measureable world. On one hand, it is used to test the full theory, which, in its own form, is extremely complex and difficult to directly apply.On the other hand, making connections to the real world sheds light on further improvement of the LQG theory. These reasons make LQC a promising and enlightening subject to study. In LQC, the collapsing and expanding phases are connected by the cyclic or oscillatorymodels Lidsey et al. (2004), and the universe is automatically born with a small scale factor at the fixed point near the Planck phase Bojowald (2005); Mulryne et al. (2005a). Unlike in the emergent universe model, this fixed point here is stable and allows the universe to start in an initial phase of oscillation. Then an inflationary phase is entered, which is the relevant regime for structure formation. In LQC, there aremany different inflationary scenarios Artymowski et al. (2009); Bojowald et al. (2004); Mulryne et al. (2005b); Zhang & Ling (2007), among which the one without inflation is the most attractive, mainly because it can explain the inflationary phase directly from LQG. But, unfortunately, it is difficult to study the structure formation. 16
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- 2011
27. Thermodynamics in Loop Quantum Cosmology
- Author
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Jian-Yang Zhu and Li-Fang Li
- Subjects
Physics ,Nuclear and High Energy Physics ,Article Subject ,Friedmann equations ,media_common.quotation_subject ,FOS: Physical sciences ,Thermodynamics ,Semiclassical physics ,General Relativity and Quantum Cosmology (gr-qc) ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Laws of thermodynamics ,General Relativity and Quantum Cosmology ,lcsh:QC1-999 ,Cosmology ,Universe ,Gravitational energy ,symbols.namesake ,Apparent horizon ,symbols ,lcsh:Physics ,Loop quantum cosmology ,media_common - Abstract
Loop quantum cosmology (LQC) is very powerful to deal with the behavior of early universe. And the effective loop quantum cosmology gives a successful description of the universe in the semiclassical region. We consider the apparent horizon of the Friedmann-Robertson-Walker universe as a thermodynamical system and investigate the thermodynamics of LQC in the semiclassical region. The effective density and effective pressure in the modified Friedmann equation from LQC not only determine the evolution of the universe in LQC scenario but are actually also found to be the thermodynamic quantities. This result comes from the energy definition in cosmology (the Misner-Sharp gravitational energy) and is consistent with thermodynamic laws. We prove that within the framework of loop quantum cosmology, the elementary equation of equilibrium thermodynamics is still valid., Comment: 4 pages
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- 2009
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28. Tachyon field in loop quantum cosmology: An example of traversable singularity
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Jian-Yang Zhu and Li-Fang Li
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Physics ,Nuclear and High Energy Physics ,Singularity theory ,Initial singularity ,FOS: Physical sciences ,Naked singularity ,General Relativity and Quantum Cosmology (gr-qc) ,General Relativity and Quantum Cosmology ,Theoretical physics ,Singularity ,Classical mechanics ,Quantum cosmology ,Gravitational singularity ,Big Bounce ,Ring singularity - Abstract
Loop quantum cosmology (LQC) predicts a nonsingular evolution of the universe through a bounce in the high energy region. But LQC has an ambiguity about the quantization scheme. Recently, the authors in [Phys. Rev. D 77, 124008 (2008)] proposed a new quantization scheme. Similar to others, this new quantization scheme also replaces the big bang singularity with the quantum bounce. More interestingly, it introduces a quantum singularity, which is traversable. We investigate this novel dynamics quantitatively with a tachyon scalar field, which gives us a concrete example. Our result shows that our universe can evolve through the quantum singularity regularly, which is different from the classical big bang singularity. So this singularity is only a week singularity., 7 pages, 3 figures. Accepted for publication in Physical Review D
- Published
- 2008
29. Clinical Value of Brainstem Auditory Evoked Potential in the Diagnosis of Vertebrobasilar Ischemia.
- Author
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Zhang, Xiao-Jing, Zhang, Li-Jun, Zhu, Jing, He, Min, Wang, Ze, Wang, Jun, Zhang, Min-Jian, Li, Fang-Li, Shen, Jian, Bai, Yu, and Cheng, Ji-Wei
- Subjects
BRAIN stem ,BLOOD circulation disorders ,AUDITORY evoked response ,ULTRASONIC imaging - Abstract
Objective: The objective of this study was to explore the clinical value of brainstem auditory evoked potential (BAEP) in the diagnosis of vertebrobasilar ischemia (VBI). Methods: The subjects were divided into the 2 following groups: an observation group of 300 VBI patients and a control group of 100 normal healthy volunteers. BAEP examination was carried out in both groups, and then the results were analyzed and compared. Results: BAEP abnormalities were observed in 59% (177 out of 300) of the patients in the observation group: brainstem type 64.4% (114 cases), inner-ear type 7.4% (13 cases), and mixed type 28.2% (50 cases). In the control group, abnormalities were observed in only 9% (9 cases): inner-ear type 66.7% (6 cases) and mixed type 33.3% (3 cases). There was a statistically significant difference between the 2 groups in their total abnormality rates (p < 0.05). After the neck twisting test, the BAEP abnormality rate of the observation group rose to 85% (255 cases) and was significantly different from that of normal BAEP (p < 0.05). Conclusion: BAEP is an easy but effective auxiliary means for the noninvasive examination of VBI with a high positive rate, thus providing objective evidence for the diagnosis of VBI that may be useful in future clinical application. © 2015 S. Karger AG, Basel [ABSTRACT FROM AUTHOR]
- Published
- 2015
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30. Existence of positive solutions for some boundary value problem with parameter.
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Li-Fang Li
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- 2011
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31. Vector condensate and AdS soliton instability induced by a magnetic field.
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Rong-Gen Cai, Li Li, Li-Fang Li, and You Wu
- Abstract
We continue to study the holographic p-wave superconductor model in the Einstein-Maxwell-complex vector field theory with a non-minimal coupling between the complex vector field and the Maxwell field. In this paper we work in the AdS soliton background which describes a conformal field theory in the confined phase and focus on the probe approximation. We find that an applied magnetic field can lead to the condensate of the vector field and the AdS soliton instability. As a result, a vortex lattice structure forms in the spatial directions perpendicular to the applied magnetic field. As a comparison, we also discuss the vector condensate in the Einstein-SU(2) Yang-Mills theory and find that in the setup of the present paper, the Einstein-Maxwell-complex vector field model is a generalization of the SU(2) model in the sense that the vector field has a general mass and gyromagnetic ratio. [ABSTRACT FROM AUTHOR]
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- 2014
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32. A holographic p-wave superconductor model.
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Rong-Gen Cai, Li Li, and Li-Fang Li
- Abstract
We study a holographic p-wave superconductor model in a four dimensional Einstein-Maxwell-complex vector field theory with a negative cosmological constant. The complex vector field is charged under the Maxwell field. We solve the full coupled equations of motion of the system and find black hole solutions with the vector hair. The vector hairy black hole solutions are dual to a thermal state with the U(1) symmetry as well as the spatial rotational symmetry broken spontaneously. Depending on two parameters, the mass and charge of the vector field, we find a rich phase structure: zeroth order, first order and second order phase transitions can happen in this model. We also find "retrograde condensation" in which the hairy black hole solution exists only for the temperatures above a critical value with the free energy much larger than the one of the black hole without the vector hair. We construct the phase diagram for this system in terms of the temperature and charge of the vector field. [ABSTRACT FROM AUTHOR]
- Published
- 2014
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33. Effect of the Initial Mass Function of Primaries on Binary Stellar Populations.
- Author
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Feng-Hui, Zhang, Zhan-Wen, Han, and Li-Fang, Li
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- 2005
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34. Gravitational Iensing effects on parameter estimation in gravitational wave detection with advanced detectors.
- Author
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Zhoujian Cao, Li-Fang Li, and Yan Wang
- Subjects
- *
GRAVITATIONAL wave detectors , *PARAMETER estimation , *ELECTROMAGNETIC fields , *ASTROPHYSICS research , *MARKOV chain Monte Carlo , *MILKY Way - Abstract
The gravitational Iensing effect is important to the detection of electromagnetic signals in astrophysics. The gravitational wave Iensing effect has also been found significant to gravitational wave detection in the past decade. Recent analysis shows that the Iensing events for advanced detectors could be quite plausible. The black holes in our Milky Way Galaxy may play the role of lens objects. These facts motivate us to study the Iensing effects on gravitational wave signals for advanced detectors. Taking advanced LIGO and Einstein Telescope for examples, we investigate the Iensing effects on the parameter extraction of gravitational wave signals. Using the Markov chain Monte Carlo simulation together with matched filtering methods, we find that the Iensing effect for a lens object with small mass is negligible. But when the mass of the lens object increases to larger than 1000MQ the Iensing effect becomes important. Using the template without Iensing corrections would result in loss of signal detections. In contrast if we consider templates with Iensing effects, the lensed signal may provide much information about the lens black hole. These facts may give us a new way to determine the parameters of the Iensing object. For example, this kind of signal may also help us estimate the mass and the distance of the supermassive black hole hosted at the center of our Galaxy. [ABSTRACT FROM AUTHOR]
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- 2014
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35. Evaluation of Distinct Blood Lymphocyte Populations in Human Immunodeficiency Virus Type 1-Infected Subjects in the Absence or Presence of Effective Therapy.
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Derdeyn, Cynthia A., Kilby, J. Michael, Miralles, G. Diego, Li-Fang Li, Sfakianos, Greg, Saag, Michael S., and Hockett, Richard D.
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HIV infections ,LYMPHOCYTES ,HIV-positive persons ,ANTIVIRAL agents - Abstract
Virus reservoirs can persist in human immunodeficiency virus type 1 (HIV-1)-infected subjects despite effective plasma virus suppression. To compare viral dynamics in the absence and presence of antiretroviral therapy, blood mononuclear cells from 19 subjects with high plasma RNA levels and 18 subjects following prolonged virus suppression were examined, by use of in situ hybridization, to detect virus RNA expression before and after in vitro T cell activation. This approach reveals circulating lymphocytes expressing HIV-1 RNA before activation and an increase in cells with detectable HIV-1 RNA transcription after in vitro activation. The frequencies of these 2 cell populations are strongly correlated with plasma virus load and appear to be stable once a new steady state is established during therapy. The frequency of viral RNA-positive cells is equivalent to the frequency of cells that produce infectious virus. Thus, in HIV-1-infected subjects there are distinct virus reservoirs comprising both latent and replication-active cells. [ABSTRACT FROM AUTHOR]
- Published
- 1999
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36. A photometric study of the high-mass-ratio contact binary AV Puppis.
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Quan-Wang Han, Li-Fang Li, and Deng-Kai Jiang
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- 2019
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37. Effect of Phantom Dark Energy on Holographic Thermalization.
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Xiao-Xiong Zeng, Xin-Yun Hu, and Li-Fang Li
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HOLOGRAPHY ,DARK energy ,BLACK holes ,CHEMICAL potential ,THERMAL analysis ,PLASMA gases - Abstract
Holographic thermalization for a black hole surrounded by phantom dark energy is probed. The result shows that the smaller the phantom dark energy parameter is, the easier the is plasma to thermalize as the chemical potential is fixed, the larger the chemical potential is, and the harder the plasma is to thermalize as the dark energy parameter is fixed. The thermalization velocity and thermalization acceleration are presented by fitting the thermalization curves. [ABSTRACT FROM AUTHOR]
- Published
- 2017
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38. Evolutionary Population Synthesis for Single Stellar Populations.
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Feng-Hui, Zhang, Zhan-Wen, Han, Li-Fang, Li, and Hurley, Jarrod R.
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- 2002
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39. Non-Gaussian features from the inverse volume corrections in loop quantum cosmology.
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Li-Fang Li, Rong-Gen Cai, Zong-Kuan Guo, and Bin Hu
- Subjects
- *
QUANTUM cosmology , *INFLATIONARY universe , *GAUSSIAN processes - Abstract
In this paper we study the non-Gaussian features of the primordial fluctuations in loop quantum cosmology with the inverse volume corrections. The detailed analysis is performed in the single field slow-roll inflationary models. However, our results reflect the universal characteristics of bispectrum in loop quantum cosmology. The main corrections to the scalar bispectrum come from two aspects: one is the modifications to the standard Bunch-Davies vacuum, and the other is the corrections to the background dependent variables, such as slow-roll parameters. Our calculations show that the loop quantum corrections make fNL of the inflationary models increase 0.1%. Moreover, we find that two new shapes of non-Gaussian signal arise, which we name F1 and F2. The former gives a unique loop quantum feature, which is less correlated with the local, equilateral, and single types, while the latter is highly correlated with the local one. [ABSTRACT FROM AUTHOR]
- Published
- 2012
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40. Holographic thermalization and gravitational collapse in a spacetime dominated by quintessence dark energy.
- Author
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Xiao-Xiong Zeng, De-You Chen, and Li-Fang Li
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- *
GRAVITATIONAL collapse , *DARK energy , *EQUATIONS of state , *ENERGY density , *HOLOGRAPHY - Abstract
In this paper, the thermalization has been studied holographically. Explicitly in the gravity side, we consider the gravitational collapse of a thin shell of dust in a spacetime dominated by quintessence dark energy. With the thermalization probes such as the normalized geodesic length and minimal area surface, we study the effect of the state parameter for the quintessence dark energy on the thermalization. Our results show that the smaller the state parameter of quintessence is, the harder the plasma to thermalize. We also investigate the thermalization velocity and thermalization acceleration. We hope our results here can shed light on the nature of the quintessence dark energy. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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41. Wilson line response of holographic superconductors in Gauss-Bonnet gravity.
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Rong-Gen Cai, Li Li, Li-Fang Li, Hai-Qing Zhang, and Yun-Long Zhang
- Subjects
- *
SUPERCONDUCTORS , *SOLITONS , *GRAVITATION , *GEOMETRIC connections , *NONLINEAR theories , *PHYSICAL sciences - Abstract
We study the Wilson line response in the holographic superconducting phase transitions in the Gauss- Bonnet gravity. In the black brane background case, the Little-Parks periodicity is independent of the Gauss-Bonnet parameter, while in the anti-de Sitter soliton case, there is no evidence for the Little-Parks periodicity. We further study the impact of the Gauss-Bonnet term on the holographic phase transitions quantitatively. For a given Wilson line, a bigger Gauss-Bonnet coefficient makes the phase transition easier for the black brane background while harder for the soliton background. For a given chemical potential, the response to the Wilson line is less sensitive for a bigger Gauss-Bonnet coefficient in the black brane case while the response is more sensitive in the soliton case. And more, a bigger Gauss- Bonnet coefficient makes the superconducting state more stable for both the black brane and the soliton backgrounds. [ABSTRACT FROM AUTHOR]
- Published
- 2013
- Full Text
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42. Mechanism of action of gypenosides on type 2 diabetes and non-alcoholic fatty liver disease in rats.
- Author
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He Q, Li JK, Li F, Li RG, Zhan GQ, Li G, Du WX, and Tan HB
- Subjects
- Alanine Transaminase blood, Animals, Aspartate Aminotransferases blood, Biomarkers blood, Blood Glucose drug effects, Blood Glucose metabolism, Cytochrome P-450 CYP1A1 genetics, Cytochrome P-450 CYP1A1 metabolism, Diabetes Mellitus, Type 2 blood, Diabetes Mellitus, Type 2 genetics, Disease Models, Animal, Dose-Response Relationship, Drug, Gene Expression Regulation, Gynostemma, Insulin blood, Lipids blood, Liver metabolism, Liver pathology, Male, NF-kappa B metabolism, Non-alcoholic Fatty Liver Disease blood, Non-alcoholic Fatty Liver Disease genetics, Non-alcoholic Fatty Liver Disease pathology, PPAR gamma genetics, PPAR gamma metabolism, Plant Extracts pharmacology, RNA, Messenger metabolism, Rats, Sprague-Dawley, Time Factors, Tumor Necrosis Factor-alpha metabolism, Diabetes Mellitus, Type 2 drug therapy, Liver drug effects, Non-alcoholic Fatty Liver Disease drug therapy
- Abstract
Aim: To explore the mechanism of action of gypenosides (GPs) on type 2 diabetes mellitus and non-alcoholic fatty liver disease (T2DM-NAFLD) in rats., Methods: Sixty rats were randomly divided into a healthy group, an untreated disease model group and GP-treatment groups. The study involved the evaluation of biochemical parameters, including serum aspartate transaminase (AST), alanine transferase (ALT), blood glucose (BG), triglycerides (TG) and total cholesterol (TC). Additionally, the protective effect of the treatments were confirmed histopathologically and the expression of TNF-α and NF-κB in the rat liver was analyzed using immunohistochemistry. The expression of proliferator-activated receptor gamma (PPARγ) and cytochrome P450 (CYP450) 1A1 mRNA was determined by quantitative RT-PCR., Results: GP treatments at oral doses of 200, 400, and 800 mg/kg per day significantly decreased the levels of serum AST and ALT (P<0.05, P<0.01), especially at the dose of 800 mg/kg per day. To a similar extent, GP at 800 mg/kg per day reduced the levels of BG (4.19±0.47, P<0.01), TG (80.08±10.05, P<0.01), TC (134.38±16.39, P<0.01) and serum insulin (42.01±5.04, P<0.01). The expression of TNF-α and NF-κB measured by immunohistochemistry was significantly reduced by GPs in a dose-dependent manner, and the expression of PPARγ and CYP4501A1 mRNA, as measured using quantitative real-time PCR, were significantly down-regulated by GPs. Moreover, GPs decreased the infiltration of liver fats and reversed the histopathological changes in a dose-dependent manner., Conclusion: This study suggests that GPs have a protective effect against T2DM-NAFLD by down-regulating the expression of TNF-α and NF-κB proteins, and PPARγ and CYP4501A1 mRNAs.
- Published
- 2015
- Full Text
- View/download PDF
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