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3. Essentiality landscape of metabolic networks

Author

Kim, P., Han, K., Lee, D. -S., and Kahng, B.

Subjects
Quantitative Biology - Molecular Networks, Quantitative Biology - Quantitative Methods
Abstract

Local perturbations of individual metabolic reactions may result in different levels of lethality, depending on their roles in metabolism and the size of subsequent cascades induced by their failure. Moreover, essentiality of individual metabolic reactions may show large variations within and across species. Here we quantify their essentialities in hundreds of species by computing the growth rate after removal of individual and pairs of reactions by flux balance analysis. We find that about 10% of reactions are essential, i.e., growth stops without them, and most of the remaining reactions are redundant in the metabolic network of each species. This large-scale and cross-species study allows us to determine ad hoc ages of each reaction and species. We find that when a reaction is older and contained in younger species, the reaction is more likely to be essential. Such correlations of essentiality with the ages of reactions and species may be attributable to the evolution of cellular metabolism, in which alternative pathways are recruited to ensure the stability of important reactions to various degrees across species.

Published
2018
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4. Recent advances of percolation theory in complex networks

Author

Lee, Deokjae, Cho, Y. S., Goh, K. -I., Lee, D. -S., and Kahng, B.

Subjects
Physics - Physics and Society, Condensed Matter - Statistical Mechanics
Abstract

During the past two decades, percolation has long served as a basic paradigm for network resilience, community formation and so on in complex systems. While the percolation transition is known as one of the most robust continuous transitions, the percolation transitions occurring in complex systems are often of different types such as discontinuous, hybrid, and infinite-order phase transitions. Thus, percolation has received considerable attention in network science community. Here we present a very brief review of percolation theory recently developed, which includes those types of phase transitions, critical phenomena, and finite-size scaling theory. Moreover, we discuss potential applications of theoretical results and several open questions including universal behaviors., Comment: arXiv admin note: text overlap with arXiv:1611.03588

Published
2018
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5. Relevance of the minimum degree to dynamic fluctuation in strongly heterogeneous networks

Author

Yoo, H. -H. and Lee, D. -S.

Subjects
Physics - Physics and Society, Condensed Matter - Statistical Mechanics
Abstract

The fluctuation of dynamic variables in complex networks is known to depend on the dimension and the heterogeneity of the substrate networks. Previous studies, however, have reported inconsistent results for the scaling behavior of fluctuation in strongly heterogeneous networks. To understand the origin of this conflict, we study the dynamic fluctuation on scale-free networks with a common small degree exponent but different mean degrees and minimum degrees constructed by using the configuration model and the static model. It turns out that the global fluctuation of dynamic variables diverges algebraically and logarithmically with the system size when the minimum degree is one and two, respectively. Such different global fluctuations are traced back to different, linear and sub-linear, growth of local fluctuation at individual nodes with their degrees, implying a crucial role of degree-one nodes in controlling correlation between distinct hubs., Comment: 7 pages, 5 figures

Published
2018
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6. Urn model for products' shares in international trade

Author

Barbier, Matthieu and Lee, D. -S.

Subjects
Quantitative Finance - Trading and Market Microstructure, Condensed Matter - Statistical Mechanics, Physics - Physics and Society
Abstract

International trade fluxes evolve as countries revise their portfolios of trade products towards economic development. Accordingly products' shares in international trade vary with time, reflecting the transfer of capital between distinct industrial sectors. Here we analyze the share of hundreds of product categories in world trade for four decades and find a scaling law obeyed by the annual variation of product share, which informs us of how capital flows and interacts over the product space. A model of stochastic transfer of capital between products based on the observed scaling relation is proposed and shown to reproduce exactly the empirical share distribution. The model allows analytic solutions as well as numerical simulations, which predict a pseudo-condensation of capital onto few product categories and when it will occur. At the individual level, our model finds certain products unpredictable, the excess or deficient growth of which with respect to the model prediction is shown to be correlated with the nature of goods., Comment: 9 pages, 5 figures

Published
2017
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8. External Modulation and Switching of Acoustic Phonons: Comparative Roles of Potential Distributions

Author

Jeong, H., Jho, Y. D., Rhim, S. H., Yee, K. J., Shim, J. P., Lee, D. S., Ju, J. W., Baek, J. H., and Stanton, C. J.

Subjects
Condensed Matter - Materials Science
Abstract

Acoustic phonons can be coherently generated by ultrafast displacive screening of potential gradients, often enhanced by the strong built-in piezoelectric fields, in wurtzite semiconductors. In such structures, transverse symmetry within the c plane hinders both the generation and detection of the transverse acoustic (TA) modes, and only longitudinal acoustic (LA) mode is generated. We show that even for c-GaN, the application of asymmetric potential distributions in the c plane can break the symmetry and selection rules, thus switching on the normally forbidden TA mode. This is in contrast to the LA mode, the strength of which varies with the symmetric potential distributions. By comparing transient differential reflectivity spectra in structures with and without asymmetric potential distributions, the role of the electrically attained anisotropy was further revealed by the digitized appearance of the TA mode, in clear contrast to the monotonic LA mode, and by modulations in the propagation velocities, optical birefringence, and geometrically varying sensitivities, the underlying mechanisms of which are modeled by electric-field-dependent perturbations of the dielectric tensors, incorporating the results of elastic modulations.

Published
2015

10. Origin of the hub spectral dimension in scale-free networks

Author

Hwang, S., Lee, D. -S., and Kahng, B.

Subjects
Condensed Matter - Statistical Mechanics
Abstract

The return-to-origin probability and the first passage time distribution are essential quantities for understanding transport phenomena in diverse systems. The behaviors of these quantities typically depend on the spectral dimension $d_s$. However, it was recently revealed that in scale-free networks these quantities show a crossover between two power-law regimes characterized by $ d_s $ and the so-called hub spectral dimension $d_s^{\textrm{(hub)}}$ due to the heterogeneity of connectivities of each node. To understand the origin of $d_s^{\textrm{(hub)}}$ from a theoretical perspective, we study a random walk problem on hierarchical scale-free networks by using the renormalization group (RG) approach. Under the RG transformation, not only the system size but also the degree of each node changes due to the scale-free nature of the degree distribution. We show that the anomalous behavior of random walks involving the hub spectral dimension $d_s^{\textrm{(hub)}}$ is induced by the conservation of the power-law degree distribution under the RG transformation., Comment: 10pages, 2figures

Published
2014
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11. Fast Algorithm for Relaxation Processes in Big-data Systems

Author

Hwang, S., Lee, D. -S., and Kahng, B.

Subjects
Condensed Matter - Statistical Mechanics
Abstract

Relaxation processes driven by a Laplacian matrix can be found in many real-world big-data systems, for example, in search engines on the World-Wide-Web and the dynamic load balancing protocols in mesh networks. To numerically implement such processes, a fast-running algorithm for the calculation of the pseudo inverse of the Laplacian matrix is essential. Here we propose an algorithm which computes fast and efficiently the pseudo inverse of Markov chain generator matrices satisfying the detailed-balance condition, a general class of matrices including the Laplacian. The algorithm utilizes the renormalization of the Gaussian integral. In addition to its applicability to a wide range of problems, the algorithm outperforms other algorithms in its ability to compute within a manageable computing time arbitrary elements of the pseudo inverse of a matrix of size millions by millions. Therefore our algorithm can be used very widely in analyzing the relaxation processes occurring on large-scale networked systems., Comment: 11 pages, 3 figures

Published
2014
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13. External magnetic fields and the chiral phase transition in QED at nonzero chemical potential

Author

Syu, W. -C., Lee, D. -S., and Leung, C. N.

Subjects
High Energy Physics - Phenomenology, High Energy Physics - Theory
Abstract

Inspired by recent discussions of inverse magnetic catalysis in the literature, we examine the effects of a uniform external magnetic field on the chiral phase transition in quenched ladder QED at nonzero chemical potential. In particular, we study the behaviour of the effective potential as the strength of the magnetic field is varied while the chemical potential is held constant. For a certain range of the magnetic field, the effective potential develops a local maximum. Inverse magnetic catalysis is observed at this maximum, whereas the usual magnetic catalysis is observed at the true minimum of the effective potential., Comment: 8 pages, 4 figures

Published
2013

14. First passage time for random walks in heterogeneous networks

Author

Hwang, S., Lee, D. -S., and Kahng, B.

Subjects
Condensed Matter - Statistical Mechanics
Abstract

The first passage time (FPT) for random walks is a key indicator of how fast information diffuses in a given system. Despite the role of FPT as a fundamental feature in transport phenomena, its behavior, particularly in heterogeneous networks, is not yet fully understood. Here, we study, both analytically and numerically, the scaling behavior of the FPT distribution to a given target node, averaged over all starting nodes. We find that random walks arrive quickly at a local hub, and therefore, the FPT distribution shows a crossover with respect to time from fast decay behavior (induced from the attractive effect to the hub) to slow decay behavior (caused by the exploring of the entire system). Moreover, the mean FPT is independent of the degree of the target node in the case of compact exploration. These theoretical results justify the necessity of using a random jump protocol (empirically used in search engines) and provide guidelines for designing an effective network to make information quickly accessible., Comment: 5 pages, 3 figures

Published
2012
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15. Spectral dimensions of hierarchical scale-free networks with shortcuts

Author

Hwang, S., Yun, C. -K, Lee, D. -S., Kahng, B., and Kim, D.

Subjects
Condensed Matter - Statistical Mechanics
Abstract

The spectral dimension has been widely used to understand transport properties on regular and fractal lattices. Nevertheless, it has been little studied for complex networks such as scale-free and small world networks. Here we study the spectral dimension and the return-to-origin probability of random walks on hierarchical scale-free networks, which can be either fractals or non-fractals depending on the weight of shortcuts. Applying the renormalization group (RG) approach to the Gaussian model, we obtain the spectral dimension exactly. While the spectral dimension varies between $1$ and $2$ for the fractal case, it remains at $2$, independent of the variation of network structure for the non-fractal case. The crossover behavior between the two cases is studied through the RG flow analysis. The analytic results are confirmed by simulation results and their implications for the architecture of complex systems are discussed., Comment: 10 pages, 3 figures

Published
2010
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19. Scale-free random branching tree in supercritical phase

Author

Lee, D. -S., Kim, J. S., Kahng, B., and Kim, D.

Subjects
Condensed Matter - Statistical Mechanics
Abstract

We study the size and the lifetime distributions of scale-free random branching tree in which $k$ branches are generated from a node at each time step with probability $q_k\sim k^{-\gamma}$. In particular, we focus on finite-size trees in a supercritical phase, where the mean branching number $C=\sum_k k q_k$ is larger than 1. The tree-size distribution $p(s)$ exhibits a crossover behavior when $2 < \gamma < 3$; A characteristic tree size $s_c$ exists such that for $s \ll s_c$, $p(s)\sim s^{-\gamma/(\gamma-1)}$ and for $s \gg s_c$, $p(s)\sim s^{-3/2}\exp(-s/s_c)$, where $s_c$ scales as $\sim (C-1)^{-(\gamma-1)/(\gamma-2)}$. For $\gamma > 3$, it follows the conventional mean-field solution, $p(s)\sim s^{-3/2}\exp(-s/s_c)$ with $s_c\sim (C-1)^{-2}$. The lifetime distribution is also derived. It behaves as $\ell(t)\sim t^{-(\gamma-1)/(\gamma-2)}$ for $2 < \gamma < 3$, and $\sim t^{-2}$ for $\gamma > 3$ when branching step $t \ll t_c \sim (C-1)^{-1}$, and $\ell(t)\sim \exp(-t/t_c)$ for all $\gamma > 2$ when $t \gg t_c$. The analytic solutions are corroborated by numerical results., Comment: 6 pages, 6 figures

Published
2007
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20. Synchronization transition of heterogeneously coupled oscillators on scale-free networks

Author

Oh, E., Lee, D. -S., Kahng, B., and Kim, D.

Subjects
Condensed Matter - Statistical Mechanics
Abstract

We investigate the synchronization transition of the modified Kuramoto model where the oscillators form a scale-free network with degree exponent $\lambda$. An oscillator of degree $k_i$ is coupled to its neighboring oscillators with asymmetric and degree-dependent coupling in the form of $\couplingcoeff k_i^{\eta-1}$. By invoking the mean-field approach, we determine the synchronization transition point $J_c$, which is zero (finite) when $\eta > \lambda-2$ ($\eta < \lambda-2$). We find eight different synchronization transition behaviors depending on the values of $\eta$ and $\lambda$, and derive the critical exponents associated with the order parameter and the finite-size scaling in each case. The synchronization transition is also studied from the perspective of cluster formation of synchronized vertices. The cluster-size distribution and the largest cluster size as a function of the system size are derived for each case using the generating function technique. Our analytic results are confirmed by numerical simulations., Comment: 11 pages, 3 figures and two tables

Published
2006
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21. Flow correlated percolation during vascular network formation in tumors

Author

Lee, D. -S., Rieger, H., and Bartha, K.

Subjects
Quantitative Biology - Tissues and Organs
Abstract

A theoretical model based on the molecular interactions between a growing tumor and a dynamically evolving blood vessel network describes the transformation of the regular vasculature in normal tissues into a highly inhomogeneous tumor specific capillary network. The emerging morphology, characterized by the compartmentalization of the tumor into several regions differing in vessel density, diameter and necrosis, is in accordance with experimental data for human melanoma. Vessel collapse due to a combination of severely reduced blood flow and solid stress exerted by the tumor, leads to a correlated percolation process that is driven towards criticality by the mechanism of hydrodynamic vessel stabilization., Comment: 4 pages, 3 figures (higher resolution at http://www.uni-saarland.de/fak7/rieger/HOMEPAGE/flow.eps)

Published
2005
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22. Evolution of scale-free random graphs: Potts model formulation

Author

Lee, D. -S., Goh, K. -I., Kahng, B., and Kim, D.

Subjects
Condensed Matter - Statistical Mechanics
Abstract

We study the bond percolation problem in random graphs of $N$ weighted vertices, where each vertex $i$ has a prescribed weight $P_i$ and an edge can connect vertices $i$ and $j$ with rate $P_iP_j$. The problem is solved by the $q\to 1$ limit of the $q$-state Potts model with inhomogeneous interactions for all pairs of spins. We apply this approach to the static model having $P_i\propto i^{-\mu} (0<\mu<1)$ so that the resulting graph is scale-free with the degree exponent $\lambda=1+1/\mu$. The number of loops as well as the giant cluster size and the mean cluster size are obtained in the thermodynamic limit as a function of the edge density, and their associated critical exponents are also obtained. Finite-size scaling behaviors are derived using the largest cluster size in the critical regime, which is calculated from the cluster size distribution, and checked against numerical simulation results. We find that the process of forming the giant cluster is qualitatively different between the cases of $\lambda >3$ and $2 < \lambda <3$. While for the former, the giant cluster forms abruptly at the percolation transition, for the latter, however, the formation of the giant cluster is gradual and the mean cluster size for finite $N$ shows double peaks., Comment: 34 pages, 9 figures, elsart.cls, final version appeared in NPB

Published
2004
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23. Sandpile avalanche dynamics on scale-free networks

Author

Lee, D. -S., Goh, K. -I., Kahng, B., and Kim, D.

Subjects
Condensed Matter - Statistical Mechanics
Abstract

Avalanche dynamics is an indispensable feature of complex systems. Here we study the self-organized critical dynamics of avalanches on scale-free networks with degree exponent $\gamma$ through the Bak-Tang-Wiesenfeld (BTW) sandpile model. The threshold height of a node $i$ is set as $k_i^{1-\eta}$ with $0\leq\eta<1$, where $k_i$ is the degree of node $i$. Using the branching process approach, we obtain the avalanche size and the duration distribution of sand toppling, which follow power-laws with exponents $\tau$ and $\delta$, respectively. They are given as $\tau=(\gamma-2 \eta)/(\gamma-1-\eta)$ and $\delta=(\gamma-1-\eta)/(\gamma-2)$ for $\gamma<3-\eta$, 3/2 and 2 for $\gamma>3-\eta$, respectively. The power-law distributions are modified by a logarithmic correction at $\gamma=3-\eta$., Comment: 8 pages, elsart style

Published
2004
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24. On the evolution of scale-free graphs

Author

Lee, D. -S., Goh, K. -I., Kahng, B., and Kim, D.

Subjects
Condensed Matter - Statistical Mechanics
Abstract

We study the evolution of random graphs where edges are added one by one between pairs of weighted vertices so that resulting graphs are scale-free with the degree exponent $\gamma$. We use the branching process approach to obtain scaling forms for the cluster size distribution and the largest cluster size as functions of the number of edges $L$ and vertices $N$. We find that the process of forming a spanning cluster is qualitatively different between the cases of $\gamma>3$ and $2<\gamma<3$. While for the former, a spanning cluster forms abruptly at a critical number of edges $L_c$, generating a single peak in the mean cluster size $$ as a function of $L$, for the latter, however, the formation of a spanning cluster occurs in a broad range of $L$, generating double peaks in $$., Comment: revised version, 4 pages, 6 figures, 1 table

Published
2003

25. Sandpile on Scale-Free Networks

Author

Goh, K. -I., Lee, D. -S., Kahng, B., and Kim, D.

Subjects
Condensed Matter - Statistical Mechanics
Abstract

We investigate the avalanche dynamics of the Bak-Tang-Wiesenfeld (BTW) sandpile model on scale-free (SF) networks, where threshold height of each node is distributed heterogeneously, given as its own degree. We find that the avalanche size distribution follows a power law with an exponent $\tau$. Applying the theory of multiplicative branching process, we obtain the exponent $\tau$ and the dynamic exponent $z$ as a function of the degree exponent $\gamma$ of SF networks as $\tau=\gamma/(\gamma-1)$ and $z=(\gamma-1)/(\gamma-2)$ in the range $2 < \gamma < 3$ and the mean field values $\tau=1.5$ and $z=2.0$ for $\gamma >3$, with a logarithmic correction at $\gamma=3$. The analytic solution supports our numerical simulation results. We also consider the case of uniform threshold, finding that the two exponents reduce to the mean field ones., Comment: 4 pages, 3 figures, 1 table, revtex4, final version appeared in PRL

Published
2003
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26. Nonlinear behavior in the Thermopower of Doped Carbon Nanotubes Due to Strong, Localized States

Author

Choi, Y. -M, Lee, D. -S., Czerw, R., Chiu, P. -W., Grobert, N., Terrones, M., Reyes-Reyes, M., Terrones, H., Charlier, J. -C., Ajayan, P. M., Roth, S., Carroll, D. L., and Park, Y. -W.

Subjects
Condensed Matter
Abstract

The temperature dependent thermoelectric power (TEP) of boron and nitrogen doped multi-walled carbon nanotube mats has been measured showing that such dopants can be used to modify the majority conduction from p-type to n-type. The TEP of boron doped nanotubes is positive, indicating hole-like carriers. In contrast, the nitrogen doped material exhibits negative TEP over the same temperature range, suggesting electron-like conduction. Therefore, the TEP distinct nonlinearites are primarily due to the formation of donor and acceptor states in the B- and N- doped materials. The sharply varying density of states used in our model can be directly correlated to the scanning tunneling spectroscopy studies of these materials., Comment: 4 pages, 3 figures, revtex 4, submitted to PRL

Published
2002
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27. Nonequilibrium relaxation of Bose-Einstein condensates: Real-time equations of motion and Ward identities

Author

Boyanovsky, D., Wang, S. -Y., Lee, D. -S., Yu, H. -L., and Alamoudi, S. M.

Subjects
Condensed Matter, High Energy Physics - Phenomenology, High Energy Physics - Theory
Abstract

We present a field-theoretical method to obtain consistently the equations of motion for small amplitude condensate perturbations in a homogeneous Bose-condensed gas directly in real time. It is based on linear response, and combines the Schwinger-Keldysh formulation of nonequilibrium quantum field theory with the Nambu-Gorkov formalism of quasiparticle excitations in the condensed phase and the tadpole method in quantum field theory. This method leads to causal equations of motion that allow to study the nonequilibrium evolution as an initial value problem. It also allows to extract directly the Ward identities, which are a consequence of the underlying gauge symmetry and which in equilibrium lead to the Hugenholtz-Pines theorem. An explicit one-loop calculation of the equations of motion beyond the Hartree-Fock- Bogoliubov approximation reveals that the nonlocal, absorptive contributions to the self-energies corresponding to the Beliaev and Landau damping processes are necessary to fulfill the Ward identities \emph{in} or \emph{out} of equilibrium. It is argued that a consistent implementation at low temperatures must be based on the loop expansion, which is shown to fulfill the Ward identities order by order in perturbation theory., Comment: Latex (elsart.cls), 41 pages, 4 eps figs, to appear in Ann. Phys

Published
2001
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28. Dynamical renormalization group approach to the Altarelli-Parisi-Lipatov equations

Author

Boyanovsky, D., de Vega, H. J., Lee, D. -S., Wang, S. -Y., and Yu, H. -L.

Subjects
High Energy Physics - Phenomenology
Abstract

The Altarelli-Parisi-Lipatov equations for the parton distribution functions are rederived using the dynamical renormalization group approach to quantum kinetics. This method systematically treats the ln Q^2 corrections that arises in perturbation theory as a renormalization of the parton distribution function and unambiguously indicates that the strong coupling must be allowed to run with the scale in the evolution kernel. To leading logarithmic accuracy the evolution equation is Markovian and the logarithmic divergences in the perturbative expansion are identified with the secular divergences (terms that grow in time) that emerge in a perturbative treatment of the kinetic equations in nonequilibrium systems. The resummation of the leading logarithms by the Altarelli-Parisi-Lipatov equation is thus similar to the resummation of the leading secular terms by the Boltzmann kinetic equation., Comment: 8 pages, version to appear in Phys. Rev. D

Published
2001
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29. Energy-momentum uncertainties as possible origin of threshold anomalies in UHECR and TeV-gamma ray events

Author

Ng, Y. Jack, Lee, D. -S., Oh, M. C., and van Dam, H.

Subjects
High Energy Physics - Phenomenology, Astrophysics, General Relativity and Quantum Cosmology, High Energy Physics - Theory
Abstract

A threshold anomaly refers to a theoretically expected energy threshold that is not observed experimentally. Here we offer an explanation of the threshold anomalies encountered in the ultra-high energy cosmic ray events and the TeV-gamma ray events, by arguing that energy-momentum uncertainties due to quantum gravity, too small to be detected in low-energy regime, can affect particle kinematics so as to raise or even eliminate the energy thresholds. A possible modification of the energy-momentum dispersion relation, giving rise to time-of-flight differences between photons of different energies from gamma ray bursts, is also discussed., Comment: minor changes in text and references

Published
2000
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30. Real-time nonequilibrium dynamics in hot QED plasmas: dynamical renormalization group approach

Author

Wang, S. -Y., Boyanovsky, D., de Vega, H. J., and Lee, D. -S.

Subjects
High Energy Physics - Phenomenology, Condensed Matter, High Energy Physics - Experiment, High Energy Physics - Theory, Nuclear Theory
Abstract

We study the real-time nonequilibrium dynamics in hot QED plasmas implementing a dynamical renormalization group and using the hard thermal loop (HTL) approximation. The focus is on the study of the relaxation of gauge and fermionic mean fields and on the quantum kinetics of the photon and fermion distribution functions. For semihard photons of momentum eT << k << T we find to leading order in the HTL that the gauge mean field relaxes in time with a power law as a result of infrared enhancement of the spectral density near the Landau damping threshold. The dynamical renormalization group reveals the emergence of detailed balance for microscopic time scales larger than 1/k while the rates are still varying with time. The quantum kinetic equation for the photon distribution function allows us to study photon production from a thermalized quark-gluon plasma (QGP) by off-shell effects. We find that for a QGP at temperature T ~ 200 MeV and of lifetime 10 < t < 50 fm/c the hard (k ~ T) photon production from off-shell bremsstrahlung (q -> q \gamma and \bar{q} -> \bar{q}\gamma) at O(\alpha) grows logarithmically in time and is comparable to that produced from on-shell Compton scattering and pair annihilation at O(\alpha \alpha_s). Fermion mean fields relax as e^{-\alpha T t ln(\omega_P t)} with \omega_P=eT/3 the plasma frequency, as a consequence of the emission and absorption of soft magnetic photons. A quantum kinetic equation for hard fermions is obtained directly in real time from a field theoretical approach improved by the dynamical renormalization group. The collision kernel is time-dependent and infrared finite., Comment: RevTeX, 46 pages, including 5 EPS figures, published version

Published
2000
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31. Damping Rates and Mean Free Paths of Soft Fermion Collective Excitations in a Hot Fermion-Gauge-Scalar Theory

Author

Wang, S. -Y., Boyanovsky, D., de Vega, H. J., Lee, D. -S., and Ng, Y. J.

Subjects
High Energy Physics - Phenomenology
Abstract

We study the transport coefficients, damping rates and mean free paths of soft fermion collective excitations in a hot fermion-gauge-scalar plasma with the goal of understanding the main physical mechanisms that determine transport of chirality in scenarios of non-local electroweak baryogenesis. The focus is on identifying the different transport coefficients for the different branches of soft collective excitations of the fermion spectrum. These branches correspond to collective excitations with opposite ratios of chirality to helicity and different dispersion relations. By combining results from the hard thermal loop (HTL) resummation program with a novel mechanism of fermion damping through heavy scalar decay, we obtain a robust description of the different damping rates and mean free paths for the soft collective excitations to leading order in HTL and lowest order in the Yukawa coupling. The space-time evolution of wave packets of collective excitations unambiguously reveals the respective mean free paths. We find that whereas both the gauge and scalar contribution to the damping rates are different for the different branches, the difference of mean free paths for both branches is mainly determined by the decay of the heavy scalar into a hard fermion and a soft collective excitation. We argue that these mechanisms are robust and are therefore relevant for non-local scenarios of baryogenesis either in the Standard Model or extensions thereof., Comment: REVTeX, 19 pages, 4 eps figures, published version

Published
1999
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33. The effective potential of composite fields in weakly coupled QED in a uniform external magnetic field

Author

Lee, D. -S., McGraw, P. N., Ng, Y. J., and Shovkovy, I. A.

Subjects
High Energy Physics - Theory, High Energy Physics - Phenomenology
Abstract

The effective potential for the composite fields responsible for chiral symmetry breaking in weakly coupled QED in a magnetic field is derived. The global minimum of the effective potential is found to acquire a non-vanishing expectation value of the composite fields that leads to generating the dynamical fermion mass by an external magnetic field. The results are compared with those for the Nambu-Jona-Lasinio model., Comment: 6 pages, 1 figure, REVTeX, uses epsf.sty

Published
1998
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34. Fermion Damping in a Fermion-Scalar Plasma

Author

Boyanovsky, D., de Vega, H. J., Ng, Y. J., Lee, D. -S., and Wang, S. -Y.

Subjects
High Energy Physics - Phenomenology
Abstract

In this article we study the dynamics of fermions in a fermion-scalar plasma. We begin by obtaining the effective in-medium Dirac equation in real time which is fully renormalized and causal and leads to the initial value problem. For a heavy scalar we find the novel result that the decay of the scalar into fermion pairs in the medium leads to damping of the fermionic excitations and their in-medium propagation as quasiparticles. That is, the fermions acquire a width due to the decay of the heavier scalar in the medium. We find the damping rate to lowest order in the Yukawa coupling for arbitrary values of scalar and fermion masses, temperature and fermion momentum. An all-order expression for the damping rate in terms of the exact quasiparticle wave functions is established. A kinetic Boltzmann approach to the relaxation of the fermionic distribution function confirms the damping of fermionic excitations as a consequence of the induced decay of heavy scalars in the medium. A linearization of the Boltzmann equation near equilibrium clearly displays the relationship between the damping rate of fermionic mean fields and the fermion interaction rate to lowest order in the Yukawa coupling directly in real time., Comment: REVTEX, 16 pages, 3 eps figures included, published version. To be published in Phys. Rev. D

Published
1998
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36. Chiral symmetry breaking in a uniform external magnetic field II. Symmetry restoration at high temperatures and chemical potentials

Author

Lee, D. -S., Leung, C. N., and Ng, Y. J.

Subjects
High Energy Physics - Theory, High Energy Physics - Phenomenology
Abstract

Chiral symmetry is dynamically broken in quenched, ladder QED at weak gauge couplings when an external magnetic field is present. In this paper, we show that chiral symmetry is restored above a critical chemical potential and the corresponding phase transition is of first order. In contrast, the chiral symmetry restoration at high temperatures (and at zero chemical potential) is a second order phase transition., Comment: Latex; 12 pages; 8 postscript figures included

Published
1997
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37. Chiral Symmetry Breaking in a Uniform External Magnetic Field

Author

Lee, D. -S., Leung, C. N., and Ng, Y. J.

Subjects
High Energy Physics - Theory, High Energy Physics - Phenomenology
Abstract

Using the nonperturbative Schwinger-Dyson equation, we show that chiral symmetry is dynamically broken in QED at weak couplings when an external magnetic field is present, and that chiral symmetry is restored at temperatures above $T_c \simeq \alpha\pi^2/\sqrt{2 \pi |eH|}$, where $\alpha$ is the fine structure constant and $H$ is the magnetic field strength., Comment: 21 pages, TeX

Published
1997
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38. The gauge invariant effective potential: equilibrium and non-equilibrium aspects

Author

Boyanovsky, D., Brahm, D., Holman, R., and Lee, D. -S.

Subjects
High Energy Physics - Phenomenology, High Energy Physics - Theory
Abstract

We propose a gauge invariant formulation of the effective potential in terms of a gauge invariant order parameter, for the Abelian Higgs model. The one-loop contribution at zero and finite temperature is computed explicitly, and the leading terms in the high temperature expansion are obtained. The result is contrasted to the effective potential obtained in several covariant gauge-fixing schemes, and the gauge invariant quantities that can be reliably extracted from these are identified. It is pointed out that the gauge invariant effective potential in the one-loop approximation is complex for {\em all values} of the order parameter between the maximum and the minimum of the tree level potential, both at zero and non-zero temperature. The imaginary part is related to long-wavelength instabilities towards phase separation. We study the real-time dynamics of initial states in the spinodal region, and relate the imaginary part of the effective potential to the growth rate of equal-time gauge invariant correlation functions in these states. We conjecture that the spinodal instabilities may play a role in non-equilibrium processes {\em inside} the nucleating bubbles if the transition is first order., Comment: 27 pages revtex 3.0, no figures; one reference added

Published
1996
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39. Relaxation and Kinetics in Scalar Field Theories

Author

Boyanovsky, D., Lawrie, I. D., and Lee, D. S.

Subjects
High Energy Physics - Phenomenology, Nuclear Theory
Abstract

A new approach to the dynamics of relaxation and kinetics of thermalization in a scalar field theory is presented that incorporates the relevant time scales through the resummation of hard thermal loops. An alternative derivation of the kinetic equations for the ``quasiparticle'' distribution functions is obtained that allows a clear understanding of the different ``coarse graining'' approximations usually involved in a kinetic description. This method leads to a systematic perturbative expansion to obtain the kinetic equations including hard-thermal loop resummation and to an improvement including renormalization, off-shell effects and contributions that change chemical equilibrium on short time scales. As a byproduct of these methods we establish the relation between the relaxation time scale in the linearized equation of motion of the quasiparticles and the thermalization time scale of the quasiparticle distribution function in the ``relaxation time approximation''. Hard thermal loop resummation dramatically modifies the scattering rate for long wavelength modes as compared to the usual (semi) classical estimate. Relaxation and kinetics are studied both in the unbroken and broken symmetry phases of the theory. The broken symmetry phase also provides the setting to obtain the contribution to the kinetic equations from processes that involve decay of a heavy scalar into light scalar particles in the medium., Comment: 28 pages, revtex 3.0, two figures available upon request

Published
1996
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40. New Aspects of Reheating

Author

Boyanovsky, D., D'attanasio, M., de Vega, H. J., Holman, R., and Lee, D. S.

Subjects
High Energy Physics - Phenomenology
Abstract

The reheating stage in post-inflationary cosmologies is reanalyzed. New techniques from non-equilibrium quantum field theory allow a consistent derivation of the equation of motion including the non-linearity of the dynamics. These offer a rationale for the elementary theory of reheating based on single particle decay which is seen to be valid only in the linear regime of coherent oscillations of the scalar field. A new non-perturbative mechanism of induced amplification of quantum fluctuations is introduced and studied in detail, both analytically and numerically. This is a non-linear mechanism that is typically a far more efficient way of transfering energy out of the zero mode and into production of lighter particles than single particle decay. Thermalization is discussed and we estimate the reheating temperature to be of the order of the inflaton mass, thus providing a potential solution to the Polonyi and moduli problems., Comment: To appear in the Proceedings of the School on String Gravity and Physics at the Planck Scale, Erice, Sicily, 8-19 September, Editor: N. Sanchez, Revtex, 39 pages, 9 figures available upon request

Published
1995

41. Reheating and Thermalization, Linear Vs. Non-Linear Relaxation

Author

Boyanovsky, D., D'attanasio, M., de Vega, H. J., Holman, R., and Lee, D. -S.

Subjects
High Energy Physics - Phenomenology, General Relativity and Quantum Cosmology, High Energy Physics - Theory, Nuclear Theory
Abstract

We consider the case of a scalar field, the inflaton, coupled to both lighter scalars and fermions, and the study the relaxation of the inflaton via particle production in both the linear and non-linear regimes. This has an immediate application to the reheating problem in inflationary universe models. The linear regime analysis offers a rationale for the standard approach to the reheating problem, but we make a distinction between relaxation and thermalization. We find that particle production when the inflaton starts in the {\it non-linear} region is typically a far more efficient way of transfering energy out of the inflaton zero mode and into the quanta of the lighter scalar than single particle decay. For the non-linear regime we take into account self-consistently the evolution of the expectation value of the inflaton field coupled to the evolution of the quantum fluctuations. An exhaustive numerical analysis reveals that the distribution of produced particles is far from thermal, and the effect of open channels. In the fermionic case, Pauli blocking begins to hinder the transfer of energy into the fermion modes very early on in the evolution of the inflaton. We examine the implications of our results to the question of how to calculate the reheating temperature of the universe after inflation., Comment: Revtex 3.0; 34 pages

Published
1995
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42. Reheating the Post Inflationary Universe

Author

Boyanovsky, D., D'Attanasio, M., de Vega, H. J., Holman, R., -Lee, D. S., and Singh, A.

Subjects
High Energy Physics - Phenomenology, Astrophysics
Abstract

We consider the non-equilibrium evolution of the inflaton field coupled to both lighter scalars and fermions. The dissipational dynamics of this field is studied and found to be quite different than that believed in inflationary models. In particular, the damping time scale for the expectation value of the zero momentum mode of the inflaton can be much shorter than that given by the single particle decay rate when the inflaton amplitudes are large, as in chaotic inflation scenarios. We find that the reheating temperature may depart considerably from the usual estimates., Comment: 9 pages, revtex 3.0, 3 figures available upon request

Published
1995

45. Quantum Statistical Metastability Revisited

Author

Boyanovsky, D., Holman, R., Lee, D. -S., Silva, J. P., and Singh, A.

Subjects
High Energy Physics - Phenomenology, High Energy Physics - Theory
Abstract

We calculate the decay rate for a state prepared in a thermal density matrix centered on a metastable ground state. We find a rate that is intrinsically time {\it dependent}, as opposed to the {\it constant} rates of previous works. The rate vanishes at early times, rises to a maximum and eventually falls-off to zero as a consequence of unitary time evolution. Finally, we discuss extensions of this calculation to field theories and possible implications for both sphaleron mediated transitions and first order inflationary theories., Comment: LaTex, 14 pages, 3 figures (available upon request), CMU-HEP93-08, PITT-93-04

Published
1993

46. Phase Transitions out of Equilibrium: domain formation and growth

Author

Boyanovsky, D., Lee, D. -S., and Singh, A.

Subjects
High Energy Physics - Theory
Abstract

We study the dynamics of phase transitions out of equilibrium in weakly coupled scalar field theories. We consider the case in which there is a rapid supercooling from an initial symmetric phase in thermal equilibrium at temperature $T_i>T_c$ to a final state at low temperature $T_f \approx 0$. In particular we study the formation and growth of correlated domains out of equilibrium. It is shown that the dynamics of the process of domain formation and growth (spinodal decomposition) cannot be studied in perturbation theory, and a non-perturbative self-consistent Hartree approximation is used to study the long time evolution. We find in weakly coupled theories that the size of domains grow at long times as $\xi_D(t) \approx \sqrt{t\xi(0)}$. For very weakly coupled theories, their final size is several times the zero temperature correlation length. For strongly coupled theories the final size of the domains is comparable to the zero temperature correlation length and the transition proceeds faster., Comment: 37 pages 7 figures (not included), REVTEX, PITT-92-07

Published
1992
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47. ESICM LIVES 2016: part three: Milan, Italy. 1–5 October 2016

Author

Velasquez, T., Mackey, G., Lusk, J., Kyle, U. G., Fontenot, T., Marshall, P., Shekerdemian, L. S., Coss-Bu, J. A., Nishigaki, A., Yatabe, T., Tamura, T., Yamashita, K., Yokoyama, M., Ruiz-Rodriguez, J. C., Encina, B., Belmonte, R., Troncoso, I., Tormos, P., Riveiro, M., Baena, J., Sanchez, A., Bañeras, J., Cordón, J., Duran, N., Ruiz, A., Caballero, J., Nuvials, X., Riera, J., Serra, J., Rutten, A. M. F., van Ieperen, S. N. M., Der Kinderen, E. P. H. M., Van Logten, T., Kovacikova, L., Skrak, P., Zahorec, M., Kyle, U. G., Akcan-Arikan, A., Silva, J. C., Mackey, G., Lusk, J., Goldsworthy, M., Shekerdemian, L. S., Coss-Bu, J. A., Wood, D., Harrison, D., Parslow, R., Davis, P., Pappachan, J., Goodwin, S., Ramnarayan, P., Chernyshuk, S., Yemets, H., Zhovnir, V., Pulitano’, S. M., De Rosa, S., Mancino, A., Villa, G., Tosi, F., Franchi, P., Conti, G., Patel, B., Khine, H., Shah, A., Sung, D., Singer, L., Haghbin, S., Inaloo, S., Serati, Z., Idei, M., Nomura, T., Yamamoto, N., Sakai, Y., Yoshida, T., Matsuda, Y., Yamaguchi, Y., Takaki, S., Yamaguchi, O., Goto, T., Longani, N., Medar, S., Abdel-Aal, I. R., El Adawy, A. S., Mohammed, H. M. E. H., Mohamed, A. N., Parry, S. M., Knight, L. D., Denehy, L., De Morton, N., Baldwin, C. E., Sani, D., Kayambu, G., da Silva, V. Z. M., Phongpagdi, P., Puthucheary, Z. A., Granger, C. L., Rydingsward, J. E., Horkan, C. M., Christopher, K. B., McWilliams, D., Jones, C., Reeves, E., Atkins, G., Snelson, C., Aitken, L. M., Rattray, J., Kenardy, J., Hull, A. M., Ullman, A., Le Brocque, R., Mitchell, M., Davis, C., Macfarlane, B., Azevedo, J. C., Rocha, L. L., De Freitas, F. F. M., Cavalheiro, A. M., Lucinio, N. M., Lobato, M. S., Ebeling, G., Kraegpoeth, A., Laerkner, E., De Brito-Ashurst, I., White, C., Gregory, S., Forni, L. G., Flowers, E., Curtis, A., Wood, C. A., Siu, K., Venkatesan, K., Muhammad, J. B. H., Ng, L., Seet, E., Baptista, N., Escoval, A., Tomas, E., Agrawal, R., Mathew, R., Varma, A., Dima, E., Charitidou, E., Perivolioti, E., Pratikaki, M., Vrettou, C., Giannopoulos, A., Zakynthinos, S., Routsi, C., Atchade, E., Houzé, S., Jean-Baptiste, S., Thabut, G., Genève, C., Tanaka, S., Lortat-Jacob, B., Augustin, P., Desmard, M., Montravers, P., de Molina, F. J. González, Barbadillo, S., Alejandro, R., Álvarez-Lerma, F., Vallés, J., Catalán, R. M., Palencia, E., Jareño, A., Granada, R. M., Ignacio, M. L., Cui, N., Liu, D., Wang, H., Su, L., Qiu, H., Li, R., Jaffal, K., Rouzé, A., Poissy, J., Sendid, B., Nseir, S., Paramythiotou, E., Rizos, M., Frantzeskaki, F., Antoniadou, A., Vourli, S., Zerva, L., Armaganidis, A., Riera, J., Gottlieb, J., Greer, M., Wiesner, O., Martínez, M., Acuña, M., Rello, J., Welte, T., Atchade, E., Mignot, T., Houzé, S., Jean-Baptiste, S., Thabut, G., Lortat-Jacob, B., Tanaka, S., Augustin, P., Desmard, M., Montravers, P., Soussi, S., Dudoignon, E., Ferry, A., Chaussard, M., Benyamina, M., Alanio, A., Touratier, S., Chaouat, M., Lafaurie, M., Mimoun, M., Mebazaa, A., Legrand, M., Sheils, M. A., Patel, C., Mohankumar, L., Akhtar, N., Noriega, S. K. Pacheco, Aldana, N. Navarrete, León, J. L. Ávila, Baquero, J. Durand, Bernal, F. Fernández, Ahmadnia, E., Hadley, J. S., Millar, M., Hall, D., Hewitt, H., Yasuda, H., Sanui, M., Komuro, T., Kawano, S., Andoh, K., Yamamoto, H., Noda, E., Hatakeyama, J., Saitou, N., Okamoto, H., Kobayashi, A., Takei, T., Matsukubo, S., Rotzel, H. B., Lázaro, A. Serrano, Prada, D. Aguillón, Gimillo, M. Rodriguez, Barinas, O. Diaz, Cortes, M. L. Blasco, Franco, J. Ferreres, Roca, J. M. Segura, Carratalá, A., Gonçalves, B., Turon, R., Mendes, A., Miranda, F., Mata, P. J., Cavalcanti, D., Melo, N., Lacerda, P., Kurtz, P., Righy, C., Rosario, L. E. de la Cruz, Lesmes, S. P. Gómez, Romero, J. C. García, Herrera, A. N. García, Pertuz, E. D. Díaz, Sánchez, M. J. Gómez, Sanz, E. Regidor, Hualde, J. Barado, Hernández, A. Ansotegui, Irazabal, J. M. Guergué, Spatenkova, V., Bradac, O., Suchomel, P., Urli, T., Lazzeri, E. Heusch, Aspide, R., Zanello, M., Perez-Borrero, L., Garcia-Alvarez, J. M., Arias-Verdu, M. D., Aguilar-Alonso, E., Rivera-Fernandez, R., Mora-Ordoñez, J., De La Fuente-Martos, C., Castillo-Lorente, E., Guerrero-Lopez, F., Lesmes, S. P. Gómez, Rosario, L. E. De la Cruz, Pertuz, E. D. Díaz, Hernández, A. Ansotegui, Romero, J. C. García, Sánchez, M. J. Gómez, Herrera, A. N. García, Ramírez, J. Roldán, Sanz, E. Regidor, Hualde, J. Barado, León, J. P. Tirapu, Navarro-Guillamón, L., Cordovilla-Guardia, S., Iglesias-Santiago, A., Guerrero-López, F., Fernández-Mondéjar, E., Vidal, A., Perez, M., Juez, A., Arias, N., Colino, L., Perez, J. L., Pérez, H., Calpe, P., Alcala, M. A., Robaglia, D., Perez, C., Lan, S. K., Cunha, M. M., Moreira, T., Santos, F., Lafuente, E., Fernandes, M. J., Silva, J. G., Rosario, L. E. de la Cruz, Lesmes, S. P. Gómez, Herrera, A. N. García, Romero, J. C. García, Pertuz, E. D. Díaz, Sánchez, M. J. Gómez, Sanz, E. Regidor, Echeverría, J. G. Armando, Hernández, A. Ansotegui, Hualde, J. Barado, Podlepich, V., Sokolova, E., Alexandrova, E., Lapteva, K., Kurtz, P., Shuinotsuka, C., Rabello, L., Vianna, G., Reis, A., Cairus, C., Salluh, J., Bozza, F., Torres, J. C. Barrios, Araujo, N. J. Fernández, García-Olivares, P., Keough, E., Dalorzo, M., Tang, L. K., De Sousa, I., Díaz, M., Marcos-Zambrano, L. J., Guerrero, J. E., Gomez, S. E. Zamora, Lopez, G. D. Hernandez, Cuellar, A. I. Vazquez, Nieto, O. R. Perez, Gonzalez, J. A. Castanon, Bhasin, D., Rai, S., Singh, H., Gupta, O., Bhattal, M. K., Sampley, S., Sekhri, K., Nandha, R., Aliaga, F. A., Olivares, F., Appiani, F., Farias, P., Alberto, F., Hernández, A., Pons, S., Sonneville, R., Bouadma, L., Neuville, M., Mariotte, E., Radjou, A., Lebut, J., Chemam, S., Voiriot, G., Dilly, M. P., Mourvillier, B., Dorent, R., Nataf, P., Wolff, M., Timsit, J. F., Ediboglu, O., Ataman, S., Ozkarakas, H., Kirakli, C., Vakalos, A., Avramidis, V., Obukhova, O., Kurmukov, I. A., Kashiya, S., Golovnya, E., Baikova, V. N., Ageeva, T., Haritydi, T., Kulaga, E. V., Rios-Toro, J. J., Perez-Borrero, L., Aguilar-Alonso, E., Arias-Verdu, M. D., Garcia-Alvarez, J. M., Lopez-Caler, C., De La Fuente-Martos, C., Rodriguez-Fernandez, S., Sanchez-Orézzoli, M. Gomez, Martin-Gallardo, F., Nikhilesh, J., Joshi, V., Villarreal, E., Ruiz, J., Gordon, M., Quinza, A., Gimenez, J., Piñol, M., Castellanos, A., Ramirez, P., Jeon, Y. D., Jeong, W. Y., Kim, M. H., Jeong, I. Y., Ahn, M. Y., Ahn, J. Y., Han, S. H., Choi, J. Y., Song, Y. G., Kim, J. M., Ku, N. S., Shah, H., Kellner, F., Rezai, F., Mistry, N., Yodice, P., Ovnanian, V., Fless, K., Handler, E., Alejos, R. Martínez, Romeu, J. D. Martí, Antón, D. González, Quinart, A., Martí, A. Torres, Llaurado-Serra, M., Lobo-Civico, A., Ventura-Rosado, A., Piñol-Tena, A., Pi-Guerrero, M., Paños-Espinosa, C., Peralvo-Bernat, M., Marine-Vidal, J., Gonzalez-Engroba, R., Montesinos-Cerro, N., Treso-Geira, M., Valeiras-Valero, A., Martinez-Reyes, L., Sandiumenge, A., Jimenez-Herrera, M. F., Helyar, S., Riozzi, P., Noon, A., Hallows, G., Cotton, H., Keep, J., Hopkins, P. A., Taggu, A., Renuka, S., Sampath, S., Rood, P. J. T., Frenzel, T., Verhage, R., Bonn, M., Pickkers, P., van der Hoeven, J. G., van den Boogaard, M., Corradi, F., Melnyk, L., Moggia, F., Pienovi, R., Adriano, G., Brusasco, C., Mariotti, L., Lattuada, M., Bloomer, M. J., Coombs, M., Ranse, K., Endacott, R., Maertens, B., Blot, K., Blot, S., Amerongen, M. P. van Nieuw, van der Heiden, E. S., Twisk, J. W. R., Girbes, A. R. J., Spijkstra, J. J., Riozzi, P., Helyar, S., Cotton, H., Hallows, G., Noon, A., Bell, C., Peters, K., Feehan, A., Keep, J., Hopkins, P. A., Churchill, K., Hawkins, K., Brook, R., Paver, N., Endacott, R., Maistry, N., van Wijk, A., Rouw, N., van Galen, T., Evelein-Brugman, S., Taggu, A., Krishna, B., Sampath, S., Putzu, A., Fang, M., Berto, M. Boscolo, Belletti, A., Cassina, T., Cabrini, L., Mistry, M., Alhamdi, Y., Welters, I., Abrams, S. T., Toh, C. H., Han, H. S., Gil, E. M., Lee, D. S., Park, C. M., Winder-Rhodes, S., Lotay, R., Doyle, J., Ke, M. W., Huang, W. C., Chiang, C. H., Hung, W. T., Cheng, C. C., Lin, K. C., Lin, S. C., Chiou, K. R., Wann, S. R., Shu, C. W., Kang, P. L., Mar, G. Y., Liu, C. P., Dubó, S., Aquevedo, A., Jibaja, M., Berrutti, D., Labra, C., Lagos, R., García, M. F., Ramirez, V., Tobar, M., Picoita, F., Peláez, C., Carpio, D., Alegría, L., Hidalgo, C., Godoy, K., Bakker, J., Hernández, G., Sadamoto, Y., Katabami, K., Wada, T., Ono, Y., Maekawa, K., Hayakawa, M., Sawamura, A., Gando, S., Marin-Mateos, H., Perez-Vela, J. L., Garcia-Gigorro, R., Peiretti, M. A. Corres, Lopez-Gude, M. J., Chacon-Alves, S., Renes-Carreño, E., Montejo-González, J. C., Parlevliet, K. L., Touw, H. R. W., Beerepoot, M., Boer, C., Elbers, P. W. G., Tuinman, P. R., Abdelmonem, S. A., Helmy, T. A., El Sayed, I., Ghazal, S., Akhlagh, S. H., Masjedi, M., Hozhabri, K., Kamali, E., Zýková, I., Paldusová, B., Sedlák, P., Morman, D., Youn, A. M., Ohta, Y., Sakuma, M., Bates, D., Morimoto, T., Su, P. L., Chang, W. Y., Lin, W. C., Chen, C. W., Facchin, F., Zarantonello, F., Panciera, G., De Cassai, A., Venrdramin, A., Ballin, A., Tonetti, T., Persona, P., Ori, C., Del Sorbo, L., Rossi, S., Vergani, G., Cressoni, M., Chiumello, D., Chiurazzi, C., Brioni, M., Algieri, I., Tonetti, T., Guanziroli, M., Colombo, A., Tomic, I., Colombo, A., Crimella, F., Carlesso, E., Gasparovic, V., Gattinoni, L., Neto, A. Serpa, Schmidt, M., Pham, T., Combes, A., de Abreu, M. Gama, Pelosi, P., Schultz, M. J., Katira, B. H., Engelberts, D., Giesinger, R. E., Ackerley, C., Yoshida, T., Zabini, D., Otulakowski, G., Post, M., Kuebler, W. M., McNamara, P. J., Kavanagh, B. P., Pirracchio, R., Rigon, M. Resche, Carone, M., Chevret, S., Annane, D., Eladawy, S., El-Hamamsy, M., Bazan, N., Elgendy, M., De Pascale, G., Vallecoccia, M. S., Cutuli, S. L., Di Gravio, V., Pennisi, M. A., Conti, G., Antonelli, M., Andreis, D. T., Khaliq, W., Singer, M., Hartmann, J., Harm, S., Carmona, S. Alcantara, Almudevar, P. Matia, Abellán, A. Naharro, Ramos, J. Veganzones, Pérez, L. Pérez, Valbuena, B. Lobo, Sanz, N. Martínez, Simón, I. Fernández, Arrigo, M., Feliot, E., Deye, N., Cariou, A., Guidet, B., Jaber, S., Leone, M., Resche-Rigon, M., Baron, A. Vieillard, Legrand, M., Gayat, E., Mebazaa, A., Balik, M., Kolnikova, I., Maly, M., Waldauf, P., Tavazzi, G., Kristof, J., Herpain, A., Su, F., Post, E., Taccone, F., Vincent, J. L., Creteur, J., Lee, C., Hatib, F., Jian, Z., Buddi, S., Cannesson, M., Fileković, S., Turel, M., Knafelj, R., Gorjup, V., Stanić, R., Gradišek, P., Cerović, O., Mirković, T., Noč, M., Tirkkonen, J., Hellevuo, H., Olkkola, K. T., Hoppu, S., Lin, K. C., Hung, W. T., Chiang, C. C., Huang, W. C., Juan, W. C., Lin, S. C., Cheng, C. C., Lin, P. H., Fong, K. Y., Hou, D. S., Kang, P. L., Wann, S. R., Chen, Y. S., Mar, G. Y., Liu, C. P., Paul, M., Bougouin, W., Geri, G., Dumas, F., Champigneulle, B., Legriel, S., Charpentier, J., Mira, J. P., Sandroni, C., Cariou, A., Zimmerman, J., Sullivan, E., Noursadeghi, M., Fox, B., Sampson, D., McHugh, L., Yager, T., Cermelli, S., Seldon, T., Bhide, S., Brandon, R. A., Brandon, R. B., Zwaag, J., Beunders, R., Pickkers, P., Kox, M., Gul, F., Arslantas, M. K., Genc, D., Zibandah, N., Topcu, L., Akkoc, T., Cinel, I., Greco, E., Lauretta, M. P., Andreis, D. T., Singer, M., Garcia, I. Palacios, Cordero, M., Martin, A. Diaz, Pallás, T. Aldabó, Montero, J. 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Published
2016
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49. Perioperative outcomes of laparoscopic low anterior resection using ArtiSential® versus robotic approach in patients with rectal cancer: a propensity score matching analysis.

Author

Kim, I. K., Lee, C. S., Bae, J. H., Han, S. R., Alshalawi, W., Kim, B. C., Lee, I. K., Lee, D. S., and Lee, Y. S.

Subjects
RECTAL surgery, PROPENSITY score matching, RECTAL cancer, CANCER patients, SURGICAL margin, LENGTH of stay in hospitals
Abstract

Background: Total mesorectal excision using conventional straight fixed devices may be technically difficult because of the narrow and concave pelvis. Several laparoscopic articulating tools have been introduced as an alternative to robotic systems. The aim of this study was to compare perioperative outcomes between laparoscopic low anterior resection using ArtiSential® and robot-assisted surgery for rectal cancer. Methods: This retrospective study included 682 patients who underwent laparoscopic or robotic low anterior resection for rectal cancer from September 2018 to December 2021. Among them, 82 underwent laparoscopic surgery using ArtiSential® (group A) and 201 underwent robotic surgery (group B). A total of 73 [group A; 66.37 ± 11.62; group B 65.79 ± 11.34] patients were selected for each group using a propensity score matching analysis. Results: There was no significant difference in the baseline characteristics between group A and B. Mean operative time was longer in group B than A (163.5 ± 61.9 vs 250.1 ± 77.6 min, p < 0.001). Mean length of hospital stay was not significantly different between the two groups (6.2 ± 4.7 vs 6.7 ± 6.1 days, p = 0.617). Postoperative complications, reoperation, and readmission within 30 days after surgery were similar between the two groups. Pathological findings revealed that the circumferential resection margins were above 10 mm in both groups (11.00 ± 7.47 vs 10.17 ± 6.25 mm, p = 0.960). At least 12 lymph nodes were sufficiently harvested, with no significant difference in the number harvested between the groups (20.5 ± 9.9 vs 19.7 ± 7.3, p = 0.753). Conclusions: Laparoscopic low anterior resection using ArtiSential® can achieve acceptable clinical and oncologic outcomes. ArtiSential®, a multi-joint and articulating device, may serve a feasible alternative approach to robotic surgery in rectal cancer. [ABSTRACT FROM AUTHOR]

Published
2024
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