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SUMMARY:Gravitational Wave Signatures of Dark Matter in Neutron Star Merge
 rs - Violetta Sagun\, University of Southampton
DTSTART:20250530T120000Z
DTEND:20250530T130000Z
UID:TALK231415@talks.cam.ac.uk
CONTACT:Xi Tong
DESCRIPTION:Binary neutron star mergers provide insights into strong-field
  gravity and the properties of ultra-dense nuclear matter. These events of
 fer the potential to search for signatures of physics beyond the standard 
 model\, including dark matter. We present the first numerical-relativity s
 imulations of binary neutron star mergers admixed with dark matter\, based
  on constraint-solved initial data. Modeling dark matter as a non-interact
 ing fermionic gas\, we investigate the impact of varying dark matter fract
 ions and particle masses on the merger dynamics\, ejecta mass\, post-merge
 r remnant properties\, and the emitted gravitational waves. Our simulation
 s suggest that the dark matter morphology - a dense core or a diluted halo
  - may alter the merger outcome. Scenarios with a dark matter core tend to
  exhibit a higher probability of prompt collapse\, while those with a dark
  matter halo develop a common envelope\, embedding the whole binary. Furth
 ermore\, gravitational wave signals from mergers with dark matter halo con
 figurations exhibit significant deviations from standard models when the t
 idal deformability is calculated in a two-fluid framework neglecting the d
 ilute and extended nature of the halo. This highlights the need for refine
 d models in calculating the tidal deformability when considering mergers w
 ith extended dark matter structures. These initial results provide a basis
  for further exploration of dark matter's role in binary neutron star merg
 ers and their associated gravitational wave emission and can serve as a be
 nchmark for future observations from advanced detectors and multi-messenge
 r astrophysics.
LOCATION:MR9/Zoom https://cam-ac-uk.zoom.us/j/87235967698
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