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32 papers · 1 filter
Angle resolved Cu and O photoemission intensities in CuO_2 planes
J. M. Eroles, C. D. Batista, A. A. Aligia
Using a mapping from the three-band extended Hubbard model for cuprate superconductors into a generalized t-J model, and exact diagonalization of the latter in a 4x4 cluster, we de…
Stochastic approach to inflation II: classicality, coarse-graining and noises
H. Casini, R. Montemayor, P. Sisterna
In this work we generalize a previously developed semiclassical approach to inflation, devoted to the analysis of the effective dynamics of coarse-grained fields, which are essenti…
Influence of phase space localization on the energy diffusion in a quantum chaotic billiard
D. A. Wisniacki, E. Vergini
The quantum dynamics of a chaotic billiard with moving boundary is considered in this work. We found a shape parameter Hamiltonian expansion which enables us to obtain the spectrum…
Neutrinos in a gravitational background: a test for the universality of the gravitational interaction
H. Casini, J. C. D'Olivo, R. Montemayor +1
In this work we propose an extended formulation for the interaction between neutrinos and gravitational fields. It is based on the parametrized post-Newtonian aproach, and includes…
Spin dynamics of hole doped Y2BaNiO5
C. D. Batista, A. A. Aligia, J. Eroles
Starting from a multiband Hamiltonian containing the relevant Ni and O orbitals, we derive an effective Hamiltonian for the low energy physics of doped YBaNiO$_{5}.…
Quantum-Mechanical Position Operator and Localization in Extended Systems
A. A. Aligia, G. Ortiz
We introduce a fundamental complex quantity, , which allows us to discriminate between a conducting and non-conducting thermodynamic phase in extended quantum systems. Its p…