Tübingen 2003 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 42: Kern- und Teilchen-Astrophysik IV
HK 42.2: Gruppenbericht
Donnerstag, 20. März 2003, 14:00–14:30, F
Dense QCD and Compact Star Evolution — •David Blaschke1,2, Deborah Aguilera1,3, Jens Berdermann1, Hovik Grigorian1,4, Gevorg Poghosyan4,5, and Dmitri Voskresensky6,7 — 1Fachbereich Physik, Universitaet Rostock — 2Bogoliubov Laboratory for Theoretical Physics, JINR Dubna — 3Instituto de Fisica Rosario — 4Department of Physics, Yerevan State University — 5Department fuer Physik und Astronomie, Universitaet Basel — 6Moscow Institute for Physics and Engineering — 7Theory Department, GSI Darmstadt
We report on studies of compact star evolution which indicate that some recent puzzling observations might be explained by the presence of (color superconducting) quark matter phases in the stars interior.
We suggest the following correlations of phenomena with hybrid star properties: (i) frequency (and mass) clustering of accreting compact stars in low-mass X-ray binaries with the moment of inertia of hybrid stars, (ii) enhanced cooling with direct URCA processes in quark matter, (iii) compactness of neutron stars with the mass- radius relation for hybrid stars, (iv) gamma-ray and neutrino bursts related to supernova explosions with a neutrino untrapping transition in hot protoneutron stars.
The investigations are based on the equation of state for a nonlocal chiral quark model including 2SC color superconductivity; rotating compact star configurations within general relativity and a cooling code which includes heat transport in 2SC quark matter and superfluid nuclear matter.
Supported by: DAAD-HOST programme, DFG grant No. 436 ARM 17/5/01, DFG Graduiertenkolleg 567 “Korrelierte Vielteilchensysteme”.