Dresden 2013 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 30: Schwerionenkollisionen und QCD Phasen
HK 30.1: Gruppenbericht
Dienstag, 5. März 2013, 14:00–14:30, HSZ-204
How Neutron Stars Constrain the Nuclear Equation of State — •Thomas Hell1,2, Norbert Kaiser1, and Wolfram Weise1,2 — 1Physik-Department, Technische Universität München, D-85747 Garching, Germany — 2ECT*, Strada delle Tabarelle 286, I-38123 Villazzano (Trento), Italy
Recently, the mass of the pulsar PSR J1614-2230 has been measured with high accuracy to be 1.97±0.04 solar masses. This, in addition to statistical analyses of neutron-star radii, leads to tight constraints for the equation of state of dense baryonic matter inside neutron stars. We combine a realistic phenomenological equation of state at low densities with equations of state around nuclear density derived from chiral effective field theory, on one hand, and from the Polyakov-loop-extended Nambu–Jona-Lasinio model, on the other. In the latter case, we investigate also the particular role of a vector interaction for the chiral phase transition. Our analysis strongly supports a very stiff equation of state of ordinary nuclear matter, without the need of exotic-matter admixtures, in order to reproduce the empirical observations for neutron stars.
Work supported in part by BMBF, GSI, and the DFG Excellence Cluster “Origin and Structure of the Universe”.