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cond-mat.stat-mech2007★ 4 cited
Two-time Green's functions and spectral density method in nonextensive quantum statistical mechanics
A. Cavallo, F. Cosenza, L. De Cesare
We extend the formalism of the thermodynamic two-time Green's functions to nonextensive quantum statistical mechanics. Working in the optimal Lagrangian multipliers representation,…
cond-mat.stat-mech2006★ 3 cited
The Classical Spectral Density Method at Work: The Heisenberg Ferromagnet
A. Cavallo, F. Cosenza, L. De Cesare
In this article we review a less known unperturbative and powerful many-body method in the framework of classical statistical mechanics and then we show how it works by means of ex…
cond-mat.stat-mech2005
Spectral density method in quantum nonextensive thermostatistics and magnetic systems with long-range interactions
A. Cavallo, F. Cosenza, L. De Cesare
Motived by the necessity of explicit and reliable calculations, as a valid contribution to clarify the effectiveness and, possibly, the limits of the Tsallis thermostatistics, we f…