Sample-to-sample fluctuations of the overlap distributions in the three-dimensional Edwards-Anderson spin glass

We study the sample-to-sample fluctuations of the overlap probability densities from large-scale equilibrium simulations of the three-dimensional Edwards-Anderson spin glass below the critical temperature. Ultrametricity, stochastic stability, and overlap equivalence impose constraints on the moments of the overlap probability densities that can be tested against numerical data. We found small deviations from the Ghirlanda Guerra predictions, which get smaller as system size increases. We also focus on the shape of the overlap distribution, comparing the numerical data to a mean-field-like prediction in which finite-size effects are taken into account by substituting delta functions with broad peaks.

Static versus dynamic heterogeneities in the D=3 Edwards-Anderson-ising spin glass

We numerically study the aging properties of the dynamical heterogeneities in the Ising spin glass. We find that a phase transition takes place during the aging process. Statics-dynamics correspondence implies that systems of finite size in equilibrium have static heterogeneities that obey finite-size scaling, thus signaling an analogous phase transition in the thermodynamical limit. We compute the critical exponents and the transition point in the equilibrium setting, and use them to show that aging in dynamic heterogeneities can be described by a finite-time scaling ansatz, with potential implications for experimental work.

Ficción y realidad en "Les Bienveillantes" de Jonathan Littell

En el presente trabajo se analiza "Les Bienveillantes", novela que ficciona las memorias atormentadas de un nazi. A través de su lectura se viaja a los infiernos del holocausto, de la guerra y de una conciencia sin anclajes éticos ni estéticos, narrados por una mente perversa que apenas se conmueve ante las atrocidades más profundas. Tras contrastar a lo largo de su trama ficción y realidad, se destaca, a la luz de los debates sobre la reescritura de la Historia, la operatividad de esta novela para captar y transmitir la verdad de lo ocurrido favoreciendo de ese modo el desarrollo de una conciencia responsable y la no repetición de los hechos.