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HK: Fachverband Physik der Hadronen und Kerne

HK 33: Nuclear Astrophysics IV

HK 33.2: Vortrag

Donnerstag, 19. März 2026, 14:00–14:15, PHIL A 602

Binary neutron stars: multi-messenger analyses to constrain equation of state — •Giulia Huez — Theoretisch-Physikalisches Institut, Friedrich-Schiller-Universität Jena, 07743, Jena, Germany

Binary neutron star mergers are exceptional laboratories for probing the properties of nuclear matter at supranuclear densities. To extract the physical parameters of these systems and gain insights into the underlying physics, Bayesian parameter estimation techniques have been extensively employed in multi-messenger observations of gravitational waves, kilonovae, and gamma-ray bursts. In this talk, I will present results from a joint and coherent multi-messenger analysis of GW170817, the first observed binary neutron star merger. This comprehensive approach enables tighter constraints on the extrinsic parameters of the system, such as distance and inclination, while also incorporating numerical-relativity-informed relations that connect observable quantities to the intrinsic binary properties. Through this kind of analysis, we achieve improved precision in the inference of neutron star equation of state. Furthermore, I will discuss how these results highlight key areas where future numerical-relativity simulations should focus to improve our phenomenological models, particularly for kilonovae, postmerger gravitational waves, and numerical-relativity-informed relations, thereby enhancing the accuracy and robustness of future analyses.

Keywords: binary neutron star mergers; neutron star equation of state; multi-messenger analysis; gravitational waves; postmerger