2,093 research outputs found
Fermion theories on a 2d torus with Wilson action improved by Pauli -- Villars regularization
Vectorial and anomaly free chiral U(1) fermion models on a 2d finite lattice
are considered. It is demonstrated both numerically and analytically that
introduction of Pauli -- Villars type regularization supresses the symmetry
breaking effects caused by the Wilson term.Comment: 17 pages, Latex, 6 eps-figure
Thermodynamic properties of Fermi systems with flat single-particle spectra
The behavior of strongly correlated Fermi systems is investigated beyond the
onset of a phase transition where the single-particle spectrum
becomes flat. The Landau-Migdal quasiparticle picture is shown to remain
applicable on the ordered side of this transition. Nevertheless,
low-temperature properties evaluated within this picture show profound changes
relative to results of Landau theory, as a direct consequence of the flattening
of . Stability conditions for this class of systems are examined,
and the nature of antiferromagnetic quantum phase transitions is elucidated.Comment: 5 pages, 5 figure
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