Frente a la globalización neoliberal: ¿qué movimiento feminista necesitamos?

Frente a la globalización neoliberal: ¿qué movimiento feminista necesitamos? El mal llamado movimiento antiglobalización está contra la globalización existente, no contra una globalización de lo mejor que ha inventado e ideado la humanidad. Ese movimiento necesita del feminismo y de las feministas para que ese otro mundo que sí es posible también incluya nuestros sueños de un mundo sin discriminaciones contra las mujeres. Sólo con la inclusión de nuestros anhelos, ese otro mundo realmente será posible

On the nature of the Mott transition in multiorbital systems

We analyze the nature of Mott metal-insulator transition in multiorbital systems using dynamical mean-field theory (DMFT). The auxiliary multiorbital quantum impurity problem is solved using continuous time quantum Monte Carlo (CTQMC) and the rotationally invariant slave-boson (RISB) mean field approximation. We focus our analysis on the Kanamori Hamiltonian and find that there are two markedly different regimes determined by the nature of the lowest energy excitations of the atomic Hamiltonian. The RISB results at $T\to0$ suggest the following rule of thumb for the order of the transition at zero temperature: a second order transition is to be expected if the lowest lying excitations of the atomic Hamiltonian are charge excitations, while the transition tends to be first order if the lowest lying excitations are in the same charge sector as the atomic ground state. At finite temperatures the transition is first order and its strength, as measured e.g. by the jump in the quasiparticle weight at the transition, is stronger in the parameter regime where the RISB method predicts a first order transition at zero temperature. Interestingly, these results seem to apply to a wide variety of models and parameter regimes.Comment: Accepted for publication in Physical Review

El imperio contraataca

Reconceptualizar la democracia, las libertades fundamentales y los derechos humanos en general fue una buena estrategia del feminismo antes del 11 de septiembre; la militarización de la globalización impone nuevos retos. El feminismo puede hacer la diferencia entre la globalización, como estrategia del Imperio, y la planetarización, propuesta de los grupos oprimidos que deben unirse para luchar contra el Imperio

Desarrollo de las relaciones con padres y hermanos en adolescentes argentinos

Los cambios en las relaciones con padres y hermanos se estudiaron longitudinalmente a los 13-15 y 15-17 años en 604 estudiantes que concurrían de 8° a 10° grado en Paraná, Argentina. En ambas oportunidades completaron un cuestionario que incluía preguntas sobre relaciones interpersonales, el Inventario de Depresión para Niños de Kovacs y la escala de Consumo de Sustancias de Jakobsen. A los 15-17 años, aunque disminuía la cercanía emocional con los padres, la mayoría estaba satisfecha con ambos, eran las personas más queridas y admiradas y constituían las principales fuentes de apoyo ante distintos problemas. La mayoría prefería a la madre con respecto al padre y la relación padre-hija era más lejana que el vínculo padre-hijo. Los hermanos se ubicaban terceros entre las personas más queridas; la relación con ellos era satisfactoria y las peleas infrecuentes. Quienes mantenían mejores relaciones familiares a los 13-15 mostraban menor depresión y consumo de sustancias dos años después.Changes in relationships with parents and siblings were longitudinally studied at ages 13-15 and 15-17 in 604 8th-10th graders from Paraná, Argentina. In both waves they completed questions on personal relationships, Kovacks Child Depression Inventory and Jakobsen et al. Substance Use Scale. Although closeness to parents had decreased, at ages 15-17 the vast majority felt satisfied with them; they were the most beloved and admired people and they ranked first as support providers in different situations. Mothers were preferred over fathers and the father-daughter bond was more distant than the father-son one. Siblings ranked third among the most loved people, the relationship with them was satisfactory and the fraternal quarrels, infrequent. Those having a better family relationship at age 13-15 showed less depressive symptoms and less substance use two years later

State-of-the-art techniques for calculating spectral functions in models for correlated materials

The dynamical mean field theory (DMFT) has become a standard technique for the study of strongly correlated models and materials overcoming some of the limitations of density functional approaches based on local approximations. An important step in this method involves the calculation of response functions of a multiorbital impurity problem which is related to the original model. Recently there has been considerable progress in the development of techniques based on the density matrix renormalization group (DMRG) and related matrix product states (MPS) implying a substantial improvement to previous methods. In this article we review some of the standard algorithms and compare them to the newly developed techniques, showing examples for the particular case of the half-filled two-band Hubbard model.Comment: 8 pages, 4 figures, to be published in EPL Perspective

Las mujeres y la Corte Penal Internacional

El impacto potencial en las mujeres de todo el mundo de una corte penal internacional es inmenso. Futuras víctimas de la violencia sexual ejercida en conflictos armados no tendrán que sufrir la misma suerte que las mujeres de otras guerras y conflictos casi nunca recibieron justicia de las comisiones o cortes anteriores a la CPI. Este artículo trata sobre las implicaciones de la CPI y la protección a las mujeres

Lattice specific heat for the RMIn5_5 (R = Gd, La, Y, M = Co, Rh) compounds: non-magnetic contribution subtraction

We analyze theoretically a common experimental process used to obtain the magnetic contribution to the specific heat of a given magnetic material. In the procedure, the specific heat of a non-magnetic analog is measured and used to subtract the non-magnetic contributions, which are generally dominated by the lattice degrees of freedom in a wide range of temperatures. We calculate the lattice contribution to the specific heat for the magnetic compounds GdMIn$_5$ (M = Co, Rh) and for the non-magnetic YMIn$_5$ and LaMIn$_5$ (M = Co, Rh), using density functional theory based methods. We find that the best non-magnetic analog for the subtraction depends on the magnetic material and on the range of temperatures. While the phonon specific heat contribution of YRhIn$_5$ is an excellent approximation to the one of GdCoIn$_5$ in the full temperature range, for GdRhIn$_5$ we find a better agreement with LaCoIn$_5$, in both cases, as a result of an optimum compensation effect between masses and volumes. We present measurements of the specific heat of the compounds GdMIn$_5$ (M = Co, Rh) up to room temperature where it surpasses the value expected from the Dulong-Petit law. We obtain a good agreement between theory and experiment when we include anharmonic effects in the calculations