2 papers
cond-mat.str-el2006
Effective electron-electron and electron-phonon interactions in the Hubbard-Holstein model
G. Aprea, C. Di Castro, M. Grilli +1
We investigate the interplay between the electron-electron and the electron-phonon interaction in the Hubbard-Holstein model. We implement the flow-equation method to investigate w…
gr-qc2004
Test particles behavior in the framework of a lagrangian geometric theory with propagating torsion
G. Aprea, G. Montani, R. Ruffini
Working in the lagrangian framework, we develop a geometric theory in vacuum with propagating torsion; the antisymmetric and trace parts of the torsion tensor, considered as derive…