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16 papers · 1 filter
Generalized Proper-Time Approach For The Case Of Broken Isospin Symmetry
Alexandre A. Osipov, Brigitte Hiller
We present a derivation of the low-energy effective meson Lagrangian of the Nambu -- Jona-Lasinio (NJL) model on the basis of Schwinger's proper-time regularization of the one-loop…
Database of Geneva stellar evolution tracks and isochrones for UBVRIJHKLL'M, HST-WFPC2, Geneva and Washington photometric systems
Thibault Lejeune, Daniel Schaerer
We have used an updated version of the empirically and semi-empirically calibrated BaSeL library of synthetic stellar spectra of Lejeune et al. (1997, 1998) and Westera et al. (199…
A Possible Boson Realization of Generalized Lipkin Model for Many-Fermion System
A. Kuriyama, C. Providencia, J. da Providencia +2
On the basis of the formalism proposed by three of the present authors (A.K., J.P.and M.Y.), generalized Lipkin model consisting of (M+1) single-particle levels is investigated. Th…
Clifford algebras obtained by twisting of group algebras
H. Albuquerque, S. Majid
We investigate the construction and properties of Clifford algebras by a similar manner as our previous construction of the octonions, namely as a twisting of group algebras of Z_2…
The Isospin Asymmetry in the Pseudo-spin Dynamical Symmetry
P. Alberto, M. Fiolhais, M. Malheiro +2
Pseudo-spin symmetry in nuclei is investigated considering the Dirac equation with a Lorentz structured Woods-Saxon potential. The isospin correlation of the energy splittings of p…
Microscopic theory of the two-dimensional quantum antiferromagnet in a paramagnetic phase
Victor Belinicher, Joao da Providencia
We have developed a consistent theory of the Heisenberg quantum antiferromagnet in the disordered phase with a short range antiferromagnetic order on the basis of the path integral…