BCS-BEC crossover in dense relativistic matter: Collective excitations
arXiv:0803.2422 · doi:10.1103/PhysRevD.77.096006
Abstract
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.
12 pages, REVTeX4, 7 eps figures; v2: expanded introduction, added references; version to appear in Phys. Rev. D
References in corpus (8)
- Crossover from a molecular Bose-Einstein condensate to a degenerate Fermi gas
- Quantum Fluctuations in the Superfluid State of the BCS-BEC Crossover
- BEC-BCS Crossover in the Nambu--Jona-Lasinio Model of QCD
- Relativistic BCS-BEC Crossover at Zero Temperature
- Relativistic BCS-BEC Crossover at Finite Temperature and Its Application to Color Superconductivity
- Goldstone boson counting in linear sigma models with chemical potential
- Mass spectrum of diquarks and mesons in the color--flavor locked phase of dense quark matter
- Goldstone bosons in presence of charge density