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GR: Fachverband Gravitation, Relativistische Astrophysik und Kosmologie
GR 19: Numerical Relativity III
GR 19.2: Vortrag
Freitag, 20. März 2026, 11:15–11:30, KH 02.012
Black hole spectroscopy of collapsing and merging neutron stars — •Oliver Steppohn1, Sebastian H. Völkel2, and Tim Dietrich1 — 1Institut für Physik und Astronomie, Universität Potsdam, Haus 28, Karl-Liebknecht-Str. 24-25, 14476 Potsdam, Germany — 2Max Planck Institute for Gravitational Physics (Albert Einstein Institute), Am Mühlenberg 1, 14476 Potsdam, Germany
Black hole spectroscopy is an important pillar when studying gravitational waves from black holes and enables tests of general relativity. Most of the gravitational wave signals observed over the last decade originate from binary black hole systems. Binary neutron star or black hole-neutron star systems are rarer but of particular interest for the next-generation ground-based gravitational wave detectors. These events offer the exciting possibility of studying matter effects on the ringdown of "dirty black holes". In this work, we ask the question: Does matter matter? Using numerical relativity, we simulate a wide range of collapsing neutron stars producing matter environments, both in isolated scenarios and in binary mergers. Qualitatively, the resulting ringdown signals can be classified into "clean", "modified", and "distorted" cases, depending on the amount of matter that is present. We apply standard strategies for extracting quasinormal modes of clean signals, using both theory-agnostic and theory-specific assumptions. Even in the presence of matter, possible modifications of quasinormal modes seem to be typically dominated by ringdown modeling systematics.
Keywords: Binary Neutron Star mergers; Ringdown; Quasinormal modes; Numerical Relativity