München 2019 – wissenschaftliches Programm

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GR: Fachverband Gravitation und Relativitätstheorie

GR 14: Poster Session (posters are permanently on display)

GR 14.17: Poster

Donnerstag, 21. März 2019, 16:30–18:30, HS 6

Relevance of tidal effects and post-merger dynamics for binary neutron star parameter estimation — •reetika dudi¹, francesco pannarale², tim dietrich³, mark hannam², sebastiano bernuzzi¹, frank ohme⁴, and bernd bruegmann¹ — ¹Theoretical Physics Institute, University of Jena, Jena, Germany — ²School of Physics and Astronomy, Cardiff University, Cardiff — ³Nikhef, Amsterdam, The Netherlands — ⁴Max Planck Institute for Gravitational Physics (Albert Einstein Institute), Hannover, Germany

Measurements of the properties of binary neutron star systems from gravitational-wave observations require accurate theoretical models for such signals. However, current models are incomplete, as they do not take into account all of the physics of these systems. In this work, we have explored the importance of two physical ingredients: tidal interactions during the inspiral and the imprint of the post-merger stage. We use complete inspiral--merger--post-merger waveforms constructed from a tidal effective-one-body approach and numerical-relativity simulations as signals against which we performe parameter estimates with waveform models of standard LIGO-Virgo analyses. We show that neglecting tidal effects does not lead to appreciable measurement biases in masses and spin for typical observations (small tidal deformability and signal-to-noise ratio approx. 25). However, with increasing signal-to-noise ratio or tidal deformability there are biases in the estimates of the binary parameters. The post-merger regime, instead, has no impact on gravitational-wave measurements with current detectors for the signal-to-noise ratios we consider.