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Bochum 2018 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 19: Nuclear Astrophysics II

HK 19.1: Group Report

Tuesday, February 27, 2018, 14:00–14:30, HZO 100

Constraining the nuclear equation of state through the tidal deformability of neutron stars — •Svenja Kim Greif1,2, Kai Hebeler1,2, and Achim Schwenk1,2,31Institut für Kernphysik, Technische Universität Darmstadt — 2ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH — 3Max-Planck-Institut für Kernphysik, Heidelberg

The pioneering gravitational wave observation from a binary neutron star merger opens up new possibilities to constrain the equation of state of dense matter. In particular, the observed signal allows to extract an upper bound for the dimensionless tidal deformability of neutron stars. In this work, we study to what extent simultaneous measurements of neutron star masses and tidal deformabilities can constrain radii of neutron stars and the equation of state. To this end, we consider equations of state up to nuclear densities based on chiral effective field theory interactions and extend them in a general way to higher densities. Based on a large set of equations of state, we systematically incorporate the constraints from observations and causality to derive model-independent limits for the equation of state over a wide range of densities and for the properties of neutron stars.

*This work is supported by the DFG through Grant SFB 1245 and ERC Grant No. 307986 STRONGINT.

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