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GR: Fachverband Gravitation und Relativitätstheorie

GR 6: Relativistic Astrophysics

GR 6.2: Invited Talk

Wednesday, March 22, 2023, 11:45–12:30, ZEU/0260

Modelling the multi-messenger signals of gravitational wave sources — •Stephan Rosswog — Sternwarte Hamburg, Gojenbergsweg 112, 21029 Hamburg

Compact binary systems that contain at least one neutron star are exiting sources of gravitational waves. Apart from relativistic gravity, their dynamics during a merger is governed by the microphysics of the neutron stars such as the nuclear matter equation of state or various neutrino processes. Observations of such mergers via gravitational and electromagnetic waves (and, ideally, also neutrinos) can provide many complementary facettes of the same event which can break degeneracies in the interpretation of observations.

While such multi-messenger approaches carry an enormous discovery potential, they come at the price of having to model very different physical processes (e.g. strong field gravity, nuclear matter, atomic opacities and radiative transfer) and very different length and time scales. These requirements also place high demands on the simulation methodology.

In my talk, I will review the physical and numerical challenges of such simulations, discuss a novel approach for relativistic hydrodynamics and show some first applications.