A BCS Gap on the Lattice

Details A BCS Gap on the Lattice A BCS Gap on the Lattice

2003-08-26

arxiv.org/abs/hep-lat/0308030v1

Physics

High Energy Physics

High Energy Physics - Lattice

3 pages, 3 figures, Lattice2003(nonzero)

Scientific paper

10.1016/S0920-5632(03)02639-2

Monte Carlo simulations of the 3+1 dimensional NJL model are performed with baryon chemical potential mu>0. For mu>Sigma_0, the constituent quark mass in vacuum, chiral symmetry is restored and a diquark condensate forms. We analyse the fermion propagator and find evidence for particle-hole mixing in the vicinity of the Fermi surface and an energy gap Delta>0, both of which provide evidence for superfluidity at high baryon density induced by a BCS mechanism. At (mu a)=0.8 the ratio between the BCS gap and the vacuum quark mass is Delta/Sigma_0=0.15(2).

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