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SUMMARY:Colloquium: Cosmology and fundamental physics from compact binary 
 coalescences detected by the LIGO\, Virgo and KAGRA collaboration
DTSTART:20260423T080000Z
DTEND:20260423T090000Z
DTSTAMP:20260501T034600Z
UID:indico-event-17133@indico.global
DESCRIPTION:Speakers: Simone Mastrogiovanni (INFN Roma)\n\nThe Universe ex
 pansion is one of the most puzzling open problems in modern cosmology. For
  over 20 years\, measurements of the Universe expansion rate from close-by
  and far sources are in tension hinting for the presence of new physics at
  cosmological scales. Our struggle to corroborate the presence of new phys
 ics is due to the difficulty of observing cosmological sources for which t
 he distance is known without the need of a cosmological ladder. However\, 
 a new player entered the cosmological match in 2015: Gravitational Waves (
 GWs) from compact binary coalescences (CBCs). CBCs are Standard Sirens\, t
 hey are the only known cosmological source for which it is possible to dir
 ectly measure the luminosity distance from their GW emission. Unfortunatel
 y\, the GW do not provide the other ingredient to measure the Universe exp
 ansion: the redshift. Starting from the first multi-messenger observation 
 of a binary neutron star merger in 2017\, I will discuss how GWs are rapid
 ly becoming a new avenue to study the cosmic expansion and what are their 
 population properties. I will show how astrophysical assumptions on the bl
 ack hole's formation and correlations with electromagnetic surveys for gal
 axies and neutral hydrogen abundances can provide a measure of the cosmic 
 expansion as well as tests of fundamental physics on cosmic scales. Finall
 y\, I will discuss the most recent results for the LIGO\, Virgo\, KAGRA ob
 servations.\n\nhttps://indico.global/event/17133/
LOCATION:Besprechungsraum 2 (Marietta Blau Institute for Particle Physics\
 , Dominikanerbastei 16 [PSK]\, 1010 Vienna)
URL:https://indico.global/event/17133/
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