BCS-BEC crossover in dense relativistic matter: Collective excitations

Details BCS-BEC crossover in dense relativistic matter: Collective excitations BCS-BEC crossover in dense relativistic matter: Collective excitations

2008-03-17

arxiv.org/abs/0803.2422v2

Phys.Rev.D77:096006,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, REVTeX4, 7 eps figures; v2: expanded introduction, added references; version to appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.77.096006

We study the relativistic BCS-BEC crossover within a class of Nambu-Jona-Lasinio type models, including arbitrary Lorentz-scalar pairing channels. Using the mean-field approximation we investigate spectral properties of the collective bosonic excitations in the superfluid phase, with particular attention to the Nambu--Goldstone bosons of the broken symmetry. This is a first step towards a systematic improvement of the mean-field approximation by including the fluctuation effects. The general results are illustrated on pairing in dense two-flavor quark matter - the two-flavor color superconductor.

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