2,446 research outputs found
Propagation studies for the construction of atomic macro-coherence in dense media as a tool to investigate neutrino physics
In this manuscript we review the possibility of inducing large coherence in a
macroscopic dense target by using adiabatic techniques. For this purpose we
investigate the degradation of the laser pulse through propagation, which was
also related to the size of the prepared medium. Our results show that,
although adiabatic techniques offer the best alternative in terms of stability
against experimental parameters, for very dense media it is necessary to
engineer laser-matter interaction in order to minimize laser field degradation.
This work has been triggered by the proposal of a new technique, namely
Radiative Emission of Neutrino Pairs (RENP), capable of investigating neutrino
physics through quantum optics concepts which require the preparation of a
macrocoherent state.Comment: 10 pages, 10 figure
Phase structure of a generalized Nambu Jona-Lasinio model with Wilson fermions in the mean field or large -expansion
We analyze the vacuum structure of a generalized lattice Nambu--Jona-Lasinio
model with two flavors of Wilson fermions, such that its continuum action is
the most general four-fermion action with 'trivial' color interactions, and
having a symmetry in the chiral limit. The phase structure
of this model in the space of the two four-fermion couplings shows, in addition
to the standard Aoki phases, new phases with , in
close analogy to similar results recently suggested by some of us for lattice
QCD with two degenerate Wilson fermions. This result shows how the phase
structure of an effective model for low energy QCD cannot be entirely
understood from Wilson Chiral Perturbation Theory, based on the standard QCD
chiral effective Lagrangian approach.Comment: 24 pages, 3 figures, sent to Nuclear Physics
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