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SUMMARY:Binary Neutron Star Mergers: From Numerical Relativity Simulations
  to Kilonova Properties
DTSTART:20261001T070000Z
DTEND:20261001T090000Z
DTSTAMP:20261021T024000Z
UID:indico-event-540@indico.tpi.uni-jena.de
DESCRIPTION:Speakers: Roucheng Zhai\n\nBinary neutron star mergers (BNSMs)
  are among the most energetic events in the universe and a primary site of
  the r-process that produces heavy elements. Strong general-relativistic e
 ffects make numerical simulations necessary to study their properties. In 
 this talk\, I will present our first results validating the pipelines and 
 discuss possible extensions for studying kilonova light curves and nucleos
 ynthesis. We use AthenaK\, a machine-portable GRMHD code with M1 neutrino 
 transport\, on modern GPU clusters. We use widely used equations of state 
 (EOSs): BLh\, DD2\, SFHo\, and SLy4 for equal- and unequal-mass BNSMs to a
 ssess how they influence merger outcomes. We find that harder EOSs (BLh an
 d DD2) produce long-lived neutrino-driven winds and ejecta with higher ele
 ctron fractions\, while softer EOSs (BLh and SLy4) produce short-lived rem
 nants that collapse within 10 ms in the equal-mass case. From these simula
 tions\, we extract ejecta to compute electromagnetic signals and nucleosyn
 thesis with codes like KNEC\, which we used to study composition-mixing ef
 fects in BNSM ejecta. This work will precede a project simulating a thousa
 nd BNSMs to study their statistical properties\, which can help link merge
 r properties to EM observables.\n\nhttps://indico.tpi.uni-jena.de/event/54
 0/
LOCATION:Abbeanum / 4 - HS 4 (TPI\, FSU Jena)
URL:https://indico.tpi.uni-jena.de/event/540/
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