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Bulk viscosity and the conformal anomaly in the pion gas

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dc.contributor.authorFernández Fraile, Daniel
dc.contributor.authorGómez Nicola, Ángel
dc.date.accessioned2023-06-20T03:51:54Z
dc.date.available2023-06-20T03:51:54Z
dc.date.issued2009-03-27
dc.description© 2009 The American Physical Soci. We are grateful to D. Kharzeev, G. D. Moore, and C. Pica for very useful comments. This research was partially funded by research contracts No. FPA2004-02602, No. FPA2005-02327, No. FPA2007-29115-E, No. PR34- 1856-BSCH, No. UCM-CAM 10309, and No. FPI-BES- 2005-6726.
dc.description.abstractWe calculate the bulk viscosity of the massive pion gas within unitarized chiral perturbation theory. We obtain a low-temperature peak arising from explicit conformal breaking due to the pion mass and another peak near the critical temperature, dominated by the conformal anomaly through gluon condensate terms. The correlation between bulk viscosity and conformal breaking supports a recent QCD proposal. We discuss the role of resonances, heavier states, and large-N(c) counting.
dc.description.departmentDepto. de Física Teórica
dc.description.facultyFac. de Ciencias Físicas
dc.description.refereedTRUE
dc.description.sponsorshipUCM-CAM
dc.description.statuspub
dc.eprint.idhttps://eprints.ucm.es/id/eprint/30333
dc.identifier.doi10.1103/PhysRevLett.102.121601
dc.identifier.issn0031-9007
dc.identifier.officialurlhttp://dx.doi.org/10.1103/PhysRevLett.102.121601
dc.identifier.relatedurlhttp://journals.aps.org
dc.identifier.urihttps://hdl.handle.net/20.500.14352/44580
dc.issue.number12
dc.journal.titlePhysical review letters
dc.language.isoeng
dc.publisherAmerican Physical Society
dc.relation.projectIDFPA2004-02602
dc.relation.projectIDFPA2005-02327
dc.relation.projectIDFPA2007-29115-E
dc.relation.projectIDPR34- 1856-BSCH
dc.relation.projectIDUCM-CAM 10309
dc.relation.projectIDFPI-BES- 2005-6726
dc.rights.accessRightsopen access
dc.subject.cdu51-73
dc.subject.keywordChiral perturbation-theory
dc.subject.keywordHeavy-ion collisions
dc.subject.keywordTransport-coefficients
dc.subject.keywordField-theory
dc.subject.keywordPhase-transition
dc.subject.keywordQcd
dc.subject.keywordTemperature
dc.subject.keywordMatter
dc.subject.keywordQuark
dc.subject.keywordTrace
dc.subject.ucmFísica-Modelos matemáticos
dc.subject.ucmFísica matemática
dc.titleBulk viscosity and the conformal anomaly in the pion gas
dc.typejournal article
dc.volume.number102
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