Spontaneous symmetry breaking in the linear sigma model at finite chemical potential: One-loop corrections

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dc.creatorBrauner, Tomas
dc.date2006-07-10
dc.date2006-09-22
dc.date.accessioned2026-07-07T10:25:06Z
dc.date.available2026-07-07T10:25:06Z
dc.descriptionWe investigate spontaneous symmetry breaking within the linear sigma model with the SU(2)xU(1) internal symmetry at finite chemical potential, which was suggested as a model for kaon condensation in the CFL phase of dense quark matter. One-loop corrections to the scalar field effective potential as well as its propagator are calculated. Particular attention is paid to the type-II Goldstone boson that appears in the Bose--Einstein condensed phase. Furthermore, we show that the type-I Goldstone boson -- the superfluid phonon -- is allowed to decay due to the nonlinearity of its dispersion relation at high momentum, and determine its decay width.
dc.description13 pages, REVTeX4, 37 eps figures; v2: substantial error in Sec. IV corrected, references added, other minor corrections; version to appear in Phys. Rev. D
dc.identifierhttps://arxiv.org/abs/hep-ph/0607102
dc.identifierhttp://arxiv.org/abs/hep-ph/0607102
dc.identifierPhys.Rev.D74:085010,2006
dc.identifierdoi:10.1103/PhysRevD.74.085010
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/176425
dc.subjectHigh Energy Physics - Phenomenology
dc.titleSpontaneous symmetry breaking in the linear sigma model at finite chemical potential: One-loop corrections
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