Search

In this chapter I analyse the function of pulque in the film Roma (Alfonso Cuarón, 2018) and its relationship with Cleo, the protagonist of the film. We will see how this drink is one of the most relevant in the sacred Mexican cosmogony and to what extent Cuarón uses this mythical background to give symbolic density to the remembrance of her childhood. A childhood marked by the feminine in the absence of the paternal level., En este capítulo analizo la función del pulque en la película Roma (Alfonso Cuarón, 2018) y su relación con Cleo, la protagonista del film. Veremos cómo esta bebida es una de las más relevantes de la cosmogonía sagrada mexica y hasta qué punto Cuarón utiliza ese trasfondo mítico para dotar de densidad simbólica a la rememoración de su infancia. Una infancia marcada por lo femenino en ausencia del nivel paterno.

© 2003 Elsevier Science B.V. We thank very particularly José Luis Alonso for pointing this problem to us, for his encouragement and for many discussions. It is also a pleasure to thank Francisco Guinea for discussions. The simulations were performed in the Pentium IV cluster RTN3 at the Universidad de Zaragoza. We thank the Spanish MCyT for financial support through research contracts FPA2001-1813, FPA2000-0956, BFM2001-0718 and PB98-0842. V.M.-M. is a Ramón y Cajal research fellow (MCyT)., It is shown that a bosonic formulation of the double-exchange model, one of the classical models for magnetism, generates dynamically a gauge-invariant phase in a finite region of the phase diagram. We use analytical methods, Monte Carlo simulations and finite-size scaling analysis. We study the transition line between that region and the paramagnetic phase. The numerical results show that this transition line belongs to the universality class of the antiferromagnetic RP^(2) model. The fact that one can define a universality class for the antiferromagnetic RP^(2) model, different from the one of the O(N) models, is puzzling and somehow contradicts naive expectations about universality., Spanish MCyT, Depto. de Física Teórica, Fac. de Ciencias Físicas, TRUE, pub

© 2008 American Physical Society. This work has been partially supported by MEC through Contracts No. FIS2004-01399, No. FIS2006-08533-C03, No. FIS2007-60977 and by CAM and BSCH. Computer time was obtained at BIFI, UCM, UEX, and, mainly, in the Mare Nostrum. The authors thankfully acknowledge the computer resources and technical expertise provided by the Barcelona Supercomputing Center., We present the first detailed numerical study in three dimensions of a first-order phase transition that remains first order in the presence of quenched disorder (specifically, the ferromagnetic-paramagnetic transition of the site-diluted four states Potts model). A tricritical point, which lies surprisingly near the pure-system limit and is studied by means of finite-size scaling, separates the first-order and second-order parts of the critical line. This investigation has been made possible by a new definition of the disorder average that avoids the diverging-variance probability distributions that plague the standard approach. Entropy, rather than free energy, is the basic object in this approach that exploits a recently introduced microcanonical Monte Carlo method., MEC (Spain), CAM (Spain), BSCH, Depto. de Física Teórica, Fac. de Ciencias Físicas, TRUE, pub

© 1998 Elsevier Science B.V. We thank the CICyT (contracts AEN93-0604, AEN96-1634) for partial financial support, especially for the use of dedicated Pentium Pro machines on which we have carried out the simulations. JJRL is granted by EC HMC (ERBFMBICT950429). We also acknowledge to E. Luijten for pointing out the right scaling of the Binder cumulant in the pure case., Using finite-size scaling techniques, we study the critical properties of the site-diluted Ising model in four dimensions. We carry out a high-statistics Monte Carlo simulation for several values of the dilution. The results support the perturbative scenario: there is only the Ising fixed point with large logarithmic scaling corrections. We obtain, using the Perturbative Renormalization Group, functional forms for the scaling of several observables that are in agreement with the numerical data., CICyT, Spain, EC HMC, Depto. de Física Teórica, Fac. de Ciencias Físicas, TRUE, pub

©2016 American Physical Society. This work was partially supported by the Ministerio de Economía y Competitividad (MINECO, Spain) through Grants No. FIS2012-35719-C02 and No. FIS2013-42840-P, and by the Junta de Extremadura (Spain), with partial contribution by the European Union (FEDER) through Grant No. GRU10158., We use finite size scaling to study Ising spin glasses in two spatial dimensions. The issue of universality is addressed by comparing discrete and continuous probability distributions for the quenched random couplings. The sophisticated temperature dependency of the scaling fields is identified as the major obstacle that has impeded a complete analysis. Once temperature is relinquished in favor of the correlation length as the basic variable, we obtain a reliable estimation of the anomalous dimension and of the thermal critical exponent. Universality among binary and Gaussian couplings is confirmed to a high numerical accuracy., Ministerio de Economía y Competitividad (MINECO)/FEDER, Junta de Extremadura, Depto. de Física Teórica, Fac. de Ciencias Físicas, TRUE, pub

© 1997 IOP Publishing Ltd. We thank to the CICyT (contracts AEN94-0218, AEN96-1634) for partial financial support. JJRL is granted by EC HMC (ERBFMBICT950429)., We study the site-diluted Ising model in two dimensions with Monte Carlo simulations. Using finite-size scaling techniques we compute the critical exponents observing deviations from the pure Ising ones. The differences can be explained as the effects of logarithmic corrections, without requiring to change the Universality Class., CICyT, Spain, EC HMC, Depto. de Física Teórica, Fac. de Ciencias Físicas, TRUE, pub

© 2005 The American Physical Society. It is a pleasure to thank F. Guinea for useful conversation at the beginning of this work. We have maintained interesting discussions with A. Pelissetto regarding the large-N approximation. This work has been partially supported through research contracts FPA2001-1813, FPA2000-0956, BFM2001-0718, BFM2003-8532, PB98-0842 sMCyTd and HPRN-CT-2002-00307 sEUd. We have used the PentiumIV cluster RTN3 at the Universidad de Zaragoza for the simulations. S.J. was supported by DGA., The phase diagram of the simplest approximation to double-exchange systems, the bosonic double-exchange model with antiferromagnetic (AFM) superexchange coupling, is fully worked out by means of Monte Carlo simulations, large-N expansions, and variational mean-field calculations. We find a rich phase diagram, with no first-order phase transitions. The most surprising finding is the existence of a segmentlike ordered phase at low temperature for intermediate AFM coupling which cannot be detected in neutron-scattering experiments. This is signaled by a maximum (a cusp) in the specific heat. Below the phase transition, only short-range ordering would be found in neutron scattering. Researchers looking for a quantum critical point in manganites should be wary of this possibility. Finite-size scaling estimates of critical exponents are presented, although large scaling corrections are present in the reachable lattice sizes., DGA, Depto. de Física Teórica, Fac. de Ciencias Físicas, TRUE, pub

© 1999 IOP Publishing Ltd. We acknowledge interesting discussions with D Stauffer and R Ziff. We thank CICyT (AEN97-1708 and AEN97-1693) for partial financial support. The computations have been carried out using the RTNN machines at Universidad de Zaragoza and Universidad Complutense de Madrid., Using Finite-Size Scaling techniques we obtain accurate results for critical quantities of the Ising model and the site percolation, in three dimensions. We pay special attention in parameterizing the corrections-to-scaling, what is necessary to put the systematic errors below the statistical ones., CICyT, Spain, Depto. de Física Teórica, Fac. de Ciencias Físicas, TRUE, pub

© 2003 American Physical Society. We acknowledge partial financial support from CICyT (AEN97-1680, FPA2000-0956, FPA2001-1813 and PB98- 0842) and DGA (P46/97). We also want to acknowledge the contribution of Prof. Domingo González to the development of Spanish physics, and in particular his help to our group, which has been essential to build our dedicated computers. We finally thank Giorgio Parisi for interesting comments. S. J. is a DGA fellow., We study the fluctuation-dissipation relations for a three dimensional Ising spin glass in a magnetic field both in the high temperature phase as well as in the low temperature one. In the region of times simulated we have found that our results support a picture of the low temperature phase with broken replica symmetry, but a droplet behavior cannot be completely excluded., CICyT , Spain, DGA, Spain, Depto. de Física Teórica, Fac. de Ciencias Físicas, TRUE, pub

© 2015. The American Astronomical Society. All rights reserved. This research made use of SIMBAD, operated at Centre de Données astronomiques de Strasbourg, France, and NASA's Astrophysics Data System. Financial support was provided by the Spanish Ministerio de Ciencia e Innovación and Ministerio de Economía y Competitividad under grants AYA2010-17631, AYA2010-15081, AYA2010-21697-C05-04, AYA2011-30147-C03-03, AYA2012-39364-C02-01/02, and Severo Ochoa SEV-2011-0187, and by the Canary Islands Government under grant PID2010119. R.H.B. acknowledges support from FONDECYT Regular project 1140076. J.S.-B. acknowledges support by the JAE-PreDoc program of the Spanish Consejo Superior de Investigaciones Científicas (CSIC). A.S. acknowledges support by the Janos Bolyai Research Scholarship of the Hungarian Academy of Sciences. We acknowledge F. Najarro, J. Puls, A. Herrero, J. Casares, and H. Blau for interesting discussions during the development of this paper and their useful comments on one of the latest drafts before submission. We thank G. Schaefer for providing us some information about the results from the analysis of the interferometric observations prior to publication. Lastly, we thank the anonymous referee for a very professional report that helped us to improve the first version of the manuscript. Based on observations made with the Nordic Optical Telescope, operated by the Nordic Optical Telescope Scientific Association at the Observatorio del Roque de los Muchachos, La Palma, Spain, of the Instituto de Astrofísica de Canarias. Based on observations made with the Mercator Telescope, operated on the island of La Palma by the Flemish Community, at the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias. Based on observations obtained with the HERMES spectrograph, which is supported by the Fund for Scientific Research of Flanders (FWO), Belgium, the Research Council of K.U. Leuven, Belgium, the Fonds National de la Recherche, We provide a complete characterization of the astrophysical properties of the sigma Ori Aa, Ab, B hierarchical triple system and an improved set of orbital parameters for the highly eccentric sigma Ori Aa, Ab spectroscopic binary. We compiled a spectroscopic data set comprising 90 high-resolution spectra covering a total time span of 1963 days. We applied the Lehman-Filhes method for a detailed orbital analysis of the radial velocity curves and performed a combined quantitative spectroscopic analysis of the sigma Ori Aa, Ab, B system by means of the stellar atmosphere code FASTWIND. We used our own plus other available information on photometry and distance to the system for measuring the radii, luminosities, and spectroscopic masses of the three components. We also inferred evolutionary masses and stellar ages using the Bayesian code BONNSAI. The orbital analysis of the new radial velocity curves led to a very accurate orbital solution of the sigma Ori Aa, Ab pair. We provided indirect arguments indicating that sigma Ori B is a fast-rotating early B dwarf. The FASTWIND+BONNSAI analysis showed that the Aa, Ab pair contains the hottest and most massive components of the triple system while sigma Ori B is a bit cooler and less massive. The derived stellar ages of the inner pair are intriguingly younger than the one widely accepted for the sigma Orionis cluster, at 3 +/- 1 Ma. The outcome of this study will be of key importance for a precise determination of the distance to the s Orionis cluster, the interpretation of the strong X-ray emission detected for sigma Ori Aa, Ab, B, and the investigation of the formation and evolution of multiple massive stellar systems and substellar objects., Spanish Ministerio de Ciencia e Innovación, Ministerio de Economía y Competitividad, Severo Ochoa, Canary Islands Government, FONDECYT Regular project, JAE-PreDoc program of the Spanish Consejo Superior de Investigaciones Científicas (CSIC), Janos Bolyai Research Scholarship of the Hungarian Academy of Sciences, Fund for Scientific Research of Flanders (FWO), Belgium, Research Council of K.U. Leuven, Belgium, Fonds National de la Recherche Scientifique (F.R.S.-FNRS), Belgium, Royal Observatory of Belgium, Observatoire de Genève, Switzerland, Thringer Landessternwarte Tautenburg, Germany, Depto. de Física de la Tierra y Astrofísica, Fac. de Ciencias Físicas, TRUE, pub