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GR: Fachverband Gravitation und Relativitätstheorie

GR 6: Numerical relativity

GR 6.3: Talk

Wednesday, September 1, 2021, 17:00–17:15, H6

Prompt Collapse - The Effect of Mass Ratio — •Maximilian Kölsch¹, Tim Dietrich^2,3, Maximiliano Ujevic⁴, and Bernd Brügmann¹ — ¹Theoretisch-Physikalisches Institut, FSU Jena — ²Institut für Physik und Astronomie, Universität Potsdam — ³Max Planck Institute for Gravitational Physics (Albert Einstein Institute), Potsdam — ⁴Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Brazil, São Paulo

The outcome of a binary neutron star merger dominantly depends on the total mass of the system and the equation of state describing the matter. However, the mass ratio also influences the postmerger evolution, in particular, whether there is a prompt or delayed collapse. Furthermore, the mass ratio influences which fraction of the initial baryonic mass ends up in a disc around a so formed black hole, and the mass of the latter. We investigate with a new set of general relativistic simulations the prompt collapse threshold for various total masses, mass ratios, and three equations of state. We propose a fitting formula for the dependence of the threshold mass on the mass ratio.