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Vacuum fluctuations and the thermodynamics of chiral models

We consider the thermodynamics of chiral models in the mean-field approximation and discuss the relevance of the (frequently omitted) fermion vacuum loop. Within the chiral quark-meson model and its Polyakov loop extended version, we show that the fermion vacuum fluctuations can change the order of...

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Detalles Bibliográficos
Autores principales: Skokov, V, Friman, B, Nakano, E, Redlich, K, Schaefer, B.-J
Lenguaje:eng
Publicado: 2010
Materias:
Acceso en línea:https://dx.doi.org/10.1103/PhysRevD.82.034029
http://cds.cern.ch/record/1266423
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author Skokov, V
Friman, B
Nakano, E
Redlich, K
Schaefer, B.-J
author_facet Skokov, V
Friman, B
Nakano, E
Redlich, K
Schaefer, B.-J
author_sort Skokov, V
collection CERN
description We consider the thermodynamics of chiral models in the mean-field approximation and discuss the relevance of the (frequently omitted) fermion vacuum loop. Within the chiral quark-meson model and its Polyakov loop extended version, we show that the fermion vacuum fluctuations can change the order of the phase transition in the chiral limit and strongly influence physical observables. We compute the temperature-dependent effective potential and baryon number susceptibilities in these models, with and without the vacuum term, and explore the cutoff and the pion mass dependence of the susceptibilities. Finally, in the renormalized model the divergent vacuum contribution is removed using the dimensional regularization.
id cern-1266423
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2010
record_format invenio
spelling cern-12664232019-09-30T06:29:59Zdoi:10.1103/PhysRevD.82.034029http://cds.cern.ch/record/1266423engSkokov, VFriman, BNakano, ERedlich, KSchaefer, B.-JVacuum fluctuations and the thermodynamics of chiral modelsParticle Physics - PhenomenologyWe consider the thermodynamics of chiral models in the mean-field approximation and discuss the relevance of the (frequently omitted) fermion vacuum loop. Within the chiral quark-meson model and its Polyakov loop extended version, we show that the fermion vacuum fluctuations can change the order of the phase transition in the chiral limit and strongly influence physical observables. We compute the temperature-dependent effective potential and baryon number susceptibilities in these models, with and without the vacuum term, and explore the cutoff and the pion mass dependence of the susceptibilities. Finally, in the renormalized model the divergent vacuum contribution is removed using the dimensional regularization.arXiv:1005.3166CERN-PH-TH-2010-106oai:cds.cern.ch:12664232010-05-19
spellingShingle Particle Physics - Phenomenology
Skokov, V
Friman, B
Nakano, E
Redlich, K
Schaefer, B.-J
Vacuum fluctuations and the thermodynamics of chiral models
title Vacuum fluctuations and the thermodynamics of chiral models
title_full Vacuum fluctuations and the thermodynamics of chiral models
title_fullStr Vacuum fluctuations and the thermodynamics of chiral models
title_full_unstemmed Vacuum fluctuations and the thermodynamics of chiral models
title_short Vacuum fluctuations and the thermodynamics of chiral models
title_sort vacuum fluctuations and the thermodynamics of chiral models
topic Particle Physics - Phenomenology
url https://dx.doi.org/10.1103/PhysRevD.82.034029
http://cds.cern.ch/record/1266423
work_keys_str_mv AT skokovv vacuumfluctuationsandthethermodynamicsofchiralmodels
AT frimanb vacuumfluctuationsandthethermodynamicsofchiralmodels
AT nakanoe vacuumfluctuationsandthethermodynamicsofchiralmodels
AT redlichk vacuumfluctuationsandthethermodynamicsofchiralmodels
AT schaeferbj vacuumfluctuationsandthethermodynamicsofchiralmodels