Bulk viscosity in kaon-condensed color-flavor locked quark matter

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dc.creatorAlford, Mark G.
dc.creatorBraby, Matt
dc.creatorSchmitt, Andreas
dc.date2008-06-02
dc.date2008-09-03
dc.date.accessioned2026-07-07T11:51:19Z
dc.date.available2026-07-07T11:51:19Z
dc.descriptionColor-flavor locked (CFL) quark matter at high densities is a color superconductor, which spontaneously breaks baryon number and chiral symmetry. Its low-energy thermodynamic and transport properties are therefore dominated by the H (superfluid) boson, and the octet of pseudoscalar pseudo-Goldstone bosons of which the neutral kaon is the lightest. We study the CFL-K^0 phase, in which the stress induced by the strange quark mass causes the kaons to condense, and there is an additional ultra-light "K^0" Goldstone boson arising from the spontaneous breaking of isospin. We compute the bulk viscosity of matter in the CFL-K^0 phase, which arises from the beta-equilibration processes K^0<->H+H and K^0+H<->H. We find that the bulk viscosity varies as T^7, unlike the CFL phase where it is exponentially Boltzmann-suppressed by the kaon's energy gap. However, in the temperature range of relevance for r-mode damping in compact stars, the bulk viscosity in the CFL-K^0 phase turns out to be even smaller than in the uncondensed CFL phase, which already has a bulk viscosity much smaller than all other known color-superconducting quark phases.
dc.description23 pages, 8 figures, v2: references added; minor rephrasings in the conclusions; version to appear in J. Phys. G
dc.identifierhttps://arxiv.org/abs/0806.0285
dc.identifierhttp://arxiv.org/abs/0806.0285
dc.identifierJ.Phys.G35:115007,2008
dc.identifierdoi:10.1088/0954-3899/35/11/115007
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/203859
dc.subjectNuclear Theory
dc.subjectAstrophysics
dc.subjectHigh Energy Physics - Phenomenology
dc.titleBulk viscosity in kaon-condensed color-flavor locked quark matter
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