SMuK 2021 – wissenschaftliches Programm

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GR: Fachverband Gravitation und Relativitätstheorie

GR 6: Numerical relativity

GR 6.8: Vortrag

Mittwoch, 1. September 2021, 18:15–18:30, H6

Binary neutron star merger simulations: ejecta, nucleosynthesis, EM counterparts — •Vsevolod Nedora — Theoretisch-Physikalisches Institut, Jena, Germany

GW170817 provided a plethora of information on binary neutron star (BNS) mergers and properties of matter at supranuclear densities. We further explore the remaining open questions with long-term numerical relativity (NR) BNS merger simulations with state-of-the-art numerical methods. Simulations include neutrino emission and reabsorption, the magnetic field induced viscosity via an effective model, and microphysical equations of state (EOSs) with finite temperature effects.

We find that (i) post-merger evolution is accompanied by massive outflows, spiral-wave wind, driven by complex dynamical interaction between the remnant NS and the disk and finite temperature effects; (ii) the electromagnetic (EM) signature of this new outflow corresponds to the "blue" kilonova (kN); (iii) the rapid neutron capture, r-process, nucleosynthesis final abundances in total ejecta from our simulations are compatible with solar; (iv) non-thermal kN afterglow, emitted by the ejecta interacting with the interstellar medium is compatible with the recently observed change in GRB170817A afterglow.

Overall, our results highlight the importance of the ab-initio NR BNS merger simulations with microphysical EOSs and allow to place certain tentative constraints on the properties of GW170817 and, ultimately, NS EOS.