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SUMMARY:Contributory: The Ringdown and the Tide: Fingerprints of Dark Matt
 er Halo Profiles
DTSTART;VALUE=DATE-TIME:20261117T100000Z
DTEND;VALUE=DATE-TIME:20261117T101500Z
DTSTAMP;VALUE=DATE-TIME:20261026T185102Z
UID:indico-contribution-948@indico.narit.or.th
DESCRIPTION:Speakers: Avijit Chowdhury (Indian Institute of Astrophysics)\
 nAstrophysical black holes are expected to reside in environments enriched
  by dark matter\, raising the possibility that environmental effects may l
 eave observable imprints on gravitational-wave signals. We investigate how
  the structure of a surrounding dark-matter halo modifies both the ringdow
 n and tidal response of a static\, spherically symmetric black hole. The h
 alo is modelled using a generalized $(\\alpha\,\\beta\,\\gamma)$ density p
 rofile within the Einstein cluster framework. We compute the quasinormal m
 ode spectrum and static axial tidal Love numbers\, and examine their depen
 dence on the halo compactness and density profile. We show that the halo i
 nduces a characteristic redshift of the quasinormal frequencies and dampin
 g rates\, with the strongest influence arising from the inner halo structu
 re. Time-domain evolutions confirm the frequency-domain results and exhibi
 t late-time tails whose behaviour is governed by the outer density profile
 . We further demonstrate that the tidal Love number probes the halo throug
 h a different radial weighting than the ringdown spectrum\, making the two
  observables complementary. Our results suggest that combining ringdown an
 d tidal measurements can help constrain the spatial distribution of dark m
 atter around black holes and distinguish environmental effects from genuin
 e deviations of the vacuum black-hole geometry.\n\nhttps://indico.narit.or
 .th/event/234/contributions/948/
LOCATION:Pattaya\, Thailand D Varee Jomtien Beach Pattaya Hotel
URL:https://indico.narit.or.th/event/234/contributions/948/
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