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Phys. Rev. D 73, 034025 (2006) [14 pages]

Phase diagram of neutral quark matter: The effect of neutrino trapping

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Stefan B. Rüster,¹ Verena Werth,² Michael Buballa,² Igor A. Shovkovy,³ and Dirk H. Rischke¹
¹Institut für Theoretische Physik, J. W. Goethe-Universität, D-60438 Frankfurt am Main, Germany
²Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany
³Frankfurt Institute for Advanced Studies, J. W. Goethe-Universität, D-60438 Frankfurt am Main, Germany

Received 9 September 2005; published 23 February 2006

Westudy the effect of neutrino trapping on the phase diagramof dense, locally neutral three-flavor quark matter within the frameworkof a Nambu–Jona-Lasinio model. In the analysis, dynamically generated quarkmasses are taken into account self-consistently. The phase diagrams inthe plane of temperature and quark chemical potential, as wellas in the plane of temperature and lepton-number chemical potentialare presented. We show that neutrino trapping favors two-flavor colorsuperconductivity and disfavors the color-flavor-locked phase at intermediate densities ofmatter. At the same time, the location of the criticalline separating the two-flavor color-superconducting phase and the normal phaseof quark matter is little affected by the presence ofneutrinos. The implications of these results for the evolution ofprotoneutron stars are briefly discussed.

©2006 The American Physical Society

URL:	http://link.aps.org/doi/10.1103/PhysRevD.73.034025
DOI:	10.1103/PhysRevD.73.034025
PACS:	12.39.-x; 12.38.Aw; 26.60.+c 12.39.-x Phenomenological quark models 12.38.Aw General properties of QCD (dynamics, confinement, etc.) 26.60.+c Nuclear matter aspects of neutron stars YEAR: 2006
KEYWORDS:	quark matter, colour model, quark mass, phase diagrams, chemical potential, neutrinos

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