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Article: Quark-hadron phase transitions in the viscous early universe

TitleQuark-hadron phase transitions in the viscous early universe
Authors
Issue Date2012
PublisherAmerican Physical Society. The Journal's web site is located at http://prd.aps.org
Citation
Physical Review D (Particles, Fields, Gravitation and Cosmology), 2012, v. 85 n. 8,article no. 084032 How to Cite?
AbstractIn the standard hot big bang theory, when the Universe was about 1-10μs old, the cosmological matter is conjectured to undergo quantum chromodynamics (QCD) phase transition(s) from quark matter to hadrons. In the present work, we study the cosmological quark-hadron phase transition in two different physical scenarios. First, by assuming that the phase transition would be described by an effective nucleation theory (prompt first-order phase transition), we analyze the evolution of the relevant cosmological parameters of the early universe (energy density ρ, temperature T, Hubble parameter H, and the scale factor a) before, during, and after the phase transition. To study the cosmological dynamics and the time evolution, we use both analytical and numerical methods. The case where the Universe evolved through a mixed phase with a small initial supercooling and monotonically growing hadronic bubbles is also considered in detail. The numerical estimation of the cosmological parameters, a and H for instance, shows that the time evolution of the Universe varies from phase to phase. As the QCD era turns to be fairly accessible in the high-energy experiments and the lattice QCD simulations, the QCD equation of state is very well defined. In light of these QCD results, we develop a systematic study of the crossover quark-hadron phase transition, and an estimation for the time evolution of the Hubble parameter during the crossover. © 2012 American Physical Society.
Persistent Identifierhttp://hdl.handle.net/10722/149129
ISSN
2014 Impact Factor: 4.643
2015 SCImago Journal Rankings: 1.882
ISI Accession Number ID
Funding AgencyGrant Number
RGC of the government of the Hong Kong SAR
German-Egyptian Scientific Projects (GESP)1378
Funding Information:

The work of T. H. is supported by an RGC grant of the government of the Hong Kong SAR. The work of A. T. is partly supported by the German-Egyptian Scientific Projects (GESP ID: 1378).

 

DC FieldValueLanguage
dc.contributor.authorTawfik, Ten_US
dc.contributor.authorHarko, TCen_US
dc.date.accessioned2012-06-22T06:24:54Z-
dc.date.available2012-06-22T06:24:54Z-
dc.date.issued2012en_US
dc.identifier.citationPhysical Review D (Particles, Fields, Gravitation and Cosmology), 2012, v. 85 n. 8,article no. 084032en_US
dc.identifier.issn1550-7998-
dc.identifier.urihttp://hdl.handle.net/10722/149129-
dc.description.abstractIn the standard hot big bang theory, when the Universe was about 1-10μs old, the cosmological matter is conjectured to undergo quantum chromodynamics (QCD) phase transition(s) from quark matter to hadrons. In the present work, we study the cosmological quark-hadron phase transition in two different physical scenarios. First, by assuming that the phase transition would be described by an effective nucleation theory (prompt first-order phase transition), we analyze the evolution of the relevant cosmological parameters of the early universe (energy density ρ, temperature T, Hubble parameter H, and the scale factor a) before, during, and after the phase transition. To study the cosmological dynamics and the time evolution, we use both analytical and numerical methods. The case where the Universe evolved through a mixed phase with a small initial supercooling and monotonically growing hadronic bubbles is also considered in detail. The numerical estimation of the cosmological parameters, a and H for instance, shows that the time evolution of the Universe varies from phase to phase. As the QCD era turns to be fairly accessible in the high-energy experiments and the lattice QCD simulations, the QCD equation of state is very well defined. In light of these QCD results, we develop a systematic study of the crossover quark-hadron phase transition, and an estimation for the time evolution of the Hubble parameter during the crossover. © 2012 American Physical Society.-
dc.languageengen_US
dc.publisherAmerican Physical Society. The Journal's web site is located at http://prd.aps.orgen_US
dc.relation.ispartofPhysical Review D (Particles, Fields, Gravitation and Cosmology)en_US
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.titleQuark-hadron phase transitions in the viscous early universeen_US
dc.typeArticleen_US
dc.identifier.emailTawfik, T: a.tawfik@eng.mti.edu.eg, atawfik@cern.chen_US
dc.identifier.emailHarko, TC: harko@hkucc.hku.hk-
dc.identifier.authorityHarko, TC=rp01333en_US
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1103/PhysRevD.85.084032-
dc.identifier.scopuseid_2-s2.0-84860142879-
dc.identifier.hkuros199974en_US
dc.identifier.volume85en_US
dc.identifier.issue8,article no. 084032-
dc.identifier.isiWOS:000303170000007-
dc.publisher.placeUnited States-

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