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GR: Fachverband Gravitation und Relativitätstheorie
GR 12: Relativistic Astrophysics and Scalar Fields
GR 12.2: Talk
Thursday, March 23, 2023, 14:20–14:40, ZEU/0260
Mergers of Dark Matter Admixed Neutron Stars — •Hannes Rüter1, Violetta Sagun1, Wolfgang Tichy2, and Tim Dietrich3 — 1CFisUC, Department of Physics, University of Coimbra, 3004-516 Coimbra, Portugal — 2Department of Physics, Florida Atlantic University, Boca Raton, FL 33431, USA — 3Institut für Physik und Astronomie, Universität Potsdam, Haus 28, Karl-Liebknecht-Str. 24/25, Potsdam, Germany
We investigate mergers of neutron stars consisting of two non-interacting fluids minimally coupled to the gravitational field using the numerical relativity code BAM. The first fluid represents baryonic matter, whereas the second fluid models dark matter, which we describe using the equation of state of a degenerate Fermi gas.
We consider two different scenarios for the distribution of the dark matter. In the first scenario the dark matter is confined to the core of the star, whereas in the second scenario the dark matter extends beyond the surface of the baryonic matter forming a halo around the baryonic star.
We show how the dark matter impacts the binary dynamics and merger waveforms.