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HK: Fachverband Hadronen und Kerne

HK 73: Nuclear Astrophysics

HK 73.1: Gruppenbericht

Donnerstag, 19. März 2009, 16:30–17:00, H-ZO 60

A Supernovae Equation of State with Light and Heavy Clusters — •Stefan Typel^{1, 2}, Gerd Röpke³, Thomas Klähn⁴, David Blaschke⁵, and Hermann Wolter⁶ — ¹Excellence Cluster Universe, TU München — ²GSI Darmstadt — ³Uni Rostock — ⁴Argonne National Laboratory — ⁵Uni Wrocław — ⁶LMU München

The equation of state of dense matter is an essential ingredient in astrophysical models of supernovae and compact stars. At densities below nuclear saturation and not too high temperatures, many-body correlations have a considerable impact on the thermodynamical properties. The appearance of light and heavy clusters changes the chemical composition of the system. Combining a relativistic mean-field model with density-dependent couplings and a generalized Beth-Uhlenbeck approach, it is possible to describe the dissolution of the clusters with increasing density and temperature in a microscopic, self-consistent model. The parameters can be constrained by properties of finite nuclei, neutron stars and heavy-ion collisions. Particular attention is paid to the thermodynamical consistency and the construction of phase transitions.