Bonn 2020 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 11: Invited Talks II

HK 11.3: Hauptvortrag

Dienstag, 31. März 2020, 12:00–12:30, H-HS X

Constraining the nuclear equation of state from nuclear forces and neutron star observations — •Svenja Greif — Institut für Kernphysik, Technische Universität Darmstadt — ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH

Understanding dense matter and the nuclear equation of state beyond nuclear saturation density is a challenging open problem. We use a general equation of state framework based on chiral effective field theory constraints combined with extensions using piecewise polytopes and a new speed of sound parametrization [1], including also constraints from Fermi liquid theory. In addition, we require that the general equation of state reaches the observed heavy neutron star masses. In this talk, we present first applications provided by the first mass-radius determination obtained by NASA’s NICER mission [2,3] and constraints inferred from the gravitational wave event GW170817. Complementary to the determination of the radius is the prospect of a moment of inertia measurement, which we explore for the most likely source PSR J0737−3039A.

*Supported by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) - Project-ID 279384907 - SFB 1245.

[1] Greif et al., MNRAS 485, 5363 (2019)

[2] Raaijmakers et al., ApJL 887, L22 (2019)

[3] Raaijmakers et al., arXiv:1912.11031 (2019)