SMuK 2023 – wissenschaftliches Programm
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GR: Fachverband Gravitation und Relativitätstheorie
GR 9: Gravitational Waves and Astrophysics I
GR 9.1: Vortrag
Mittwoch, 22. März 2023, 16:00–16:20, ZEU/0260
Numerical-Relativity-Informed Effective-One-Body model for Black-Hole-Neutron-Star Mergers with Higher Modes and Spin Precession — •Alejandra Gonzalez1, Rossella Gamba1, Francesco Zappa1, Gregorio Carullo1, Sebastiano Bernuzzi1, and Alessandro Nagar2 — 1Theoretisch-Physikalisches Institut, Friedrich-Schiller-Universität Jena, Fröbelstieg 1, 07743 Jena, Germany — 2INFN Sezione di Torino, Via P. Giuria 1, 10125 Torino, Italy
We present the first effective-one-body (EOB) model for generic-spins quasi-circular black-hole - neutron-star (BHNS) inspiral-merger-ringdown gravitational waveforms (GWs). Our model is based on a new numerical-relativity (NR) informed expression of the BH remnant and its ringdown, it reproduces the NR (l, m) = (2, 2) waveform with typical phase agreement of about less than 0.5 rad (less than 1 rad) to merger (ringdown). The maximum (minimum) mismatch between the (2, 2) and the NR data is 4% (0.6%). Higher modes (HMs) (2, 1), (3, 2), (3, 3), (4, 4) and (5, 5) are included and their mismatch with the available NR waveforms are up to (down to) a 60% (1%) depending on the inclination. Phase comparison with a 16 orbit precessing simulation shows differences within the NR uncertainties. We demonstrate the applicability of the model in GW parameter estimation by perfoming the first BHNS Bayesian analysis with HMs (and non-precessing spins) of the events GW190814 and GW200105, together with a new (2, 2)-mode analysis of GW200115.