Anisotropic Goldstone bosons of strong-coupling lattice QCD at high density

Details Anisotropic Goldstone bosons of strong-coupling lattice QCD at high density Anisotropic Goldstone bosons of strong-coupling lattice QCD at high density

2004-05-17

arxiv.org/abs/hep-lat/0405013v1

Phys.Rev. D70 (2004) 074512

Physics

High Energy Physics

High Energy Physics - Lattice

12 pages in RevTeX-4

Scientific paper

10.1103/PhysRevD.70.074512

We calculate the spectrum of excitations in strong-coupling lattice QCD in a background of fixed baryon density, at a substantial fraction of the saturation density. We employ a next-nearest-neighbor fermion formulation that possesses the SU(N_f)xSU(N_f) chiral symmetry of the continuum theory. We find two types of massless excitations: type I Goldstone bosons with linear dispersion relations and type II Goldstone bosons with quadratic dispersion relations. Some of the type I bosons originate as type II bosons of the nearest-neighbor theory. Bosons of either type can develop anisotropic dispersion relations, depending on the value of N_f and the baryon density.

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