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Diquark condensation effects on hot quark star configurations
Rostock University.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
Rostock University.
Hacettepe University, Ankara.
2004 (English)In: Nuclear Physics A, ISSN 0375-9474, E-ISSN 1873-1554, Vol. 736, no 1-2, 203-219 p.Article in journal (Refereed) Published
Abstract [en]

The equation of state for quark matter is derived for a nonlocal, chiral quark model within the mean field approximation. We investigate the effects of a variation of the formfactors of the interaction on the phase diagram of quark matter. Special emphasis is on the occurrence of a diquark condensate which signals a phase transition to color superconductivity and its effects on the equation of state under the condition of β-equilibrium and charge neutrality. We calculate the quark star configurations by solving the Tolman-Oppenheimer-Volkoff equations and obtain for the transition from a hot, normal quark matter core of a protoneutron star to a cool diquark condensed one a release of binding energy of the order of ΔMc2˜1053 erg. We find that this energy could not serve as an engine for explosive phenomena since the phase transition is not first order. Contrary to naive expectations the mass defect increases when for a given temperature we neglect the possibility of diquark condensation.

Place, publisher, year, edition, pages
2004. Vol. 736, no 1-2, 203-219 p.
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Other Physics Topics
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Fysik
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URN: urn:nbn:se:ltu:diva-11596DOI: 10.1016/j.nuclphysa.2004.02.022Local ID: a99e3b20-8d24-11db-8975-000ea68e967bOAI: oai:DiVA.org:ltu-11596DiVA: diva2:984546
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Validerad; 2004; 20061216 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved

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Fredriksson, Sverker

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