Berlin 2005 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 34: Theorie

HK 34.2: Vortrag

Dienstag, 8. März 2005, 16:45–17:00, TU MA042

Color superconductivity in neutron and protoneutron stars — •Verena Werth and Michael Buballa — Institut für Kernphysik, TU Darmstadt

It is expected that quark matter at high densities and low temperatures is a color superconductor. Such conditions could be realized in the interior of neutron stars or protoneutron stars. In order to examine this possibility we employ a 3-flavor NJL model, which treats diquark condensates and quark-antiquark condensates on an equal footing. The latter lead to density dependent effective quark masses, which are known to have crucial influence on the phase structure. Special emphasis is put on the constraints imposed by electric and color neutrality which have to be obeyed in neutron stars. For protoneutron stars, where neutrinos are trapped, in addition lepton number conservation must be taken into account. The resulting phase structure and possible consequences for the structure of neutron and protoneutron stars are discussed.