Bochum 2009 – scientific programme

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HK: Fachverband Hadronen und Kerne

HK 73: Nuclear Astrophysics

HK 73.3: Talk

Thursday, March 19, 2009, 17:15–17:30, H-ZO 60

Signals of the QCD phase transition in core-collapse supernovae — Irina Sagert¹, Matthias Hempel¹, •Giuseppe Pagliara², Jurgen Schaffner-Bielich², Tobias Fischer³, Anthony Mezzacappa⁴, Friederich Karl Thielemann³, and Matthias Liebendorfer³ — ¹Institut für Theoretische Physik, Goethe Universität, *Max-von-Laue-Str. 1, 60438 Frankfurt am Main, Germany — ²Institut für Theoretische Physik, Ruprecht-Karls-Universität,*Philosophenweg 16, 69120 Heidelberg, Germany — ³Department of Physics, University of Basel, Klingelbergstr. 82, 4056 Basel, Switzerland — ⁴Physics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831

We explore the implications of the QCD phase transition during the postbounce evolution of core-collapse supernovae. Using the MIT bag model for the description of quark matter and assuming small bag constants, we model phase transitions that occur during the early postbounce evolution. We show that the phase transition produces a second shock wave which triggers a delayed supernova explosion. If such a phase transition happens in a future galactic supernova, its existence and properties should become observable as a second peak in the neutrino signal that is accompanied by significant changes in the energy of the emitted neutrinos. In contrast to the first neutronization burst, this second neutrino burst is dominated by the emission of anti-neutrinos.