Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2004-05-17
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.
Bringoltz Barak
Svetitsky Benjamin
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