Investigating the mass-ratio dependence of the prompt-collapse threshold with numerical-relativity simulations

Maximilian Kölsch, Tim Dietrich, Maximiliano Ujevic, and Bernd Brügmann
Phys. Rev. D 106, 044026 – Published 11 August 2022

Abstract

The next observing runs of advanced gravitational-wave detectors will lead to a variety of binary neutron star detections and numerous possibilities for multimessenger observations of binary neutron star systems. In this context a clear understanding of the merger process and the possibility of prompt black hole formation after merger is important, as the amount of ejected material strongly depends on the merger dynamics. These dynamics are primarily affected by the total mass of the binary, however, the mass ratio also influences the postmerger evolution. To determine the effect of the mass ratio, we investigate the parameter space around the prompt-collapse threshold with a new set of fully relativistic simulations. The simulations cover three equations of state and seven mass ratios in the range of 1.0q1.75, with five to seven simulations of binary systems of different total mass in each case. The threshold mass is determined through an empirical relation based on the collapse time, which allows us to investigate effects of the mass ratio on the threshold mass and also on the properties of the remnant system. Furthermore, we model effects of mass ratio and equation of state on tidal parameters of threshold configurations.

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  • Received 31 December 2021
  • Accepted 29 June 2022

DOI:https://doi.org/10.1103/PhysRevD.106.044026

© 2022 American Physical Society

Physics Subject Headings (PhySH)

Gravitation, Cosmology & Astrophysics

Authors & Affiliations

Maximilian Kölsch1, Tim Dietrich2,3, Maximiliano Ujevic4, and Bernd Brügmann1

  • 1Theoretical Physics Institute, University of Jena, 07743 Jena, Germany
  • 2Institut für Physik und Astronomie, Universität Potsdam, Haus 28, Karl-Liebknecht-Straße 24/25, 14476 Potsdam, Germany
  • 3Max Planck Institute for Gravitational Physics (Albert Einstein Institute), Am Mühlenberg 1, Potsdam 14476, Germany
  • 4Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, 09210-170 Santo André, São Paulo, Brazil

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Issue

Vol. 106, Iss. 4 — 15 August 2022

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