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

Journal Article · Fri Oct 01 00:00:00 EDT 2004 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.70.074512· OSTI ID:20705369

Bringoltz, Barak; Svetitsky, Benjamin ^[1]

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1. School of Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, 69978 Tel Aviv (Israel)

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{sub f})xSU(N{sub 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{sub f} and the baryon density.

• OSTI ID: 20705369
• Journal Information: Physical Review. D, Particles Fields, Vol. 70, Issue 7; Other Information: DOI: 10.1103/PhysRevD.70.074512; (c) 2004 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANISOTROPY
BARYONS
CHIRAL SYMMETRY
DENSITY
DISPERSION RELATIONS
EXCITATION
GOLDSTONE BOSONS
LATTICE FIELD THEORY
QUANTUM CHROMODYNAMICS
STRONG-COUPLING MODEL
SU GROUPS