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Article: Viscous quark-gluon plasma in the early universe

TitleViscous quark-gluon plasma in the early universe
Authors
KeywordsEarly universe
Standard cosmological model
Transport properties of quark-gluon plasma
Viscous equations of state
Bulk viscosity
Issue Date2011
PublisherWiley - V C H Verlag GmbH & Co KGaA. The Journal's web site is located at http://www.wiley-vch.de/home/adp
Citation
Annalen der Physik, 2011, v. 523 n. 3, p. 194-207 How to Cite?
AbstractIn the present work a study is given for the evolution of a flat, isotropic and homogeneous Universe, which is filled with a causal bulk viscous cosmological fluid. We describe the viscous properties by an ultra-relativistic equation of state, and bulk viscosity coefficient obtained from recent lattice QCD calculations. The basic equation for the Hubble parameter is derived by using the energy equation obtained from the assumption of the covariant conservation of the energy-momentum tensor of the matter in the Universe. By assuming a power law dependence of the bulk viscosity coefficient, temperature and relaxation time on the energy density, we derive the evolution equation for the Hubble function. By using the equations of state from recent lattice QCD simulations and heavy-ion collisions we obtain an approximate solution of the field equations. In this treatment for the viscous cosmology, no evidence for singularity is observed. For example, both the Hubble parameter and the scale factor are finite at t = 0, where t is the comoving time. Furthermore, their time evolution essentially differs from the one associated with non-viscous and ideal gas. Also it is noticed that the thermodynamic quantities, like temperature, energy density and bulk pressure remain finite. Particular solutions are also considered in order to prove that the free parameter in this model does qualitatively influence the final results. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
Persistent Identifierhttp://hdl.handle.net/10722/142499
ISSN
2015 Impact Factor: 3.443
2015 SCImago Journal Rankings: 1.460
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorTawfik, Aen_US
dc.contributor.authorWahba, Men_US
dc.contributor.authorMansour, Hen_US
dc.contributor.authorHarko, TCen_US
dc.date.accessioned2011-10-28T02:49:16Z-
dc.date.available2011-10-28T02:49:16Z-
dc.date.issued2011en_US
dc.identifier.citationAnnalen der Physik, 2011, v. 523 n. 3, p. 194-207en_US
dc.identifier.issn0003-3804-
dc.identifier.urihttp://hdl.handle.net/10722/142499-
dc.description.abstractIn the present work a study is given for the evolution of a flat, isotropic and homogeneous Universe, which is filled with a causal bulk viscous cosmological fluid. We describe the viscous properties by an ultra-relativistic equation of state, and bulk viscosity coefficient obtained from recent lattice QCD calculations. The basic equation for the Hubble parameter is derived by using the energy equation obtained from the assumption of the covariant conservation of the energy-momentum tensor of the matter in the Universe. By assuming a power law dependence of the bulk viscosity coefficient, temperature and relaxation time on the energy density, we derive the evolution equation for the Hubble function. By using the equations of state from recent lattice QCD simulations and heavy-ion collisions we obtain an approximate solution of the field equations. In this treatment for the viscous cosmology, no evidence for singularity is observed. For example, both the Hubble parameter and the scale factor are finite at t = 0, where t is the comoving time. Furthermore, their time evolution essentially differs from the one associated with non-viscous and ideal gas. Also it is noticed that the thermodynamic quantities, like temperature, energy density and bulk pressure remain finite. Particular solutions are also considered in order to prove that the free parameter in this model does qualitatively influence the final results. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.-
dc.languageengen_US
dc.publisherWiley - V C H Verlag GmbH & Co KGaA. The Journal's web site is located at http://www.wiley-vch.de/home/adpen_US
dc.relation.ispartofAnnalen der Physiken_US
dc.subjectEarly universe-
dc.subjectStandard cosmological model-
dc.subjectTransport properties of quark-gluon plasma-
dc.subjectViscous equations of state-
dc.subjectBulk viscosity-
dc.titleViscous quark-gluon plasma in the early universeen_US
dc.typeArticleen_US
dc.identifier.emailHarko, TC: harko@hkucc.hku.hken_US
dc.identifier.authorityHarko, TC=rp01333en_US
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1002/andp.201000052-
dc.identifier.scopuseid_2-s2.0-79751477078-
dc.identifier.hkuros196950en_US
dc.identifier.volume523en_US
dc.identifier.issue3-
dc.identifier.spage194en_US
dc.identifier.epage207en_US
dc.identifier.isiWOS:000287163500001-
dc.publisher.placeGermany-

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