Münster 2011 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 25: Nukleare Astrophysik II
HK 25.5: Vortrag
Dienstag, 22. März 2011, 17:45–18:00, HS3
Neutrino interactions in hot strange quark matter — •Andreas Lohs1 and Jürgen Schaffner-Bielich2 — 1Institut für Theoretische Physik, Johann Wolfgang Goethe-Universität, Max von Laue-Str. 1, D-60438 Frankfurt, Germany — 2Institut für Theoretische Physik, Ruprecht-Karls-Universität, Philosophenweg 16, D-69120, Heidelberg, Germany
Recent merger simulations pointed out the possibility of the formation of compact stars or accretion disks composed by hot strange quark matter with temperatures above 10 MeV. The dominant cooling mechanisms of these objects is neutrino emission. Neutrino transport properties for large temperatures are therefore needed since to date only calculations for small temperatures were considered for the late cooling of compact stars.
We calculate the neutrino emissivities associated with electron capture by up-quark as well as d-quark decay. We show that, at variance with previous calculations, they differ from each other up to three orders of magnitude in chemical equilibrium at temperatures of a few MeV.
Furthermore we proove that positron capture is the dominant anti-neutrino producing reaction at high temperatures.
Finally we provide some examples of cooling of strange quark matter for merger environments and discuss the possible connections with short gamma ray bursts.