BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Cosmology with Dark Sirens and Galaxy Catalogues - Rachel Gray
DTSTART:20221021T120000Z
DTEND:20221021T130000Z
UID:TALK179093@talks.cam.ac.uk
CONTACT:Prahar Mitra
DESCRIPTION:Gravitational wave signals from compact binary mergers are of 
 huge interest to the cosmology community due to their ability to act as st
 andard sirens\, providing measurements of luminosity distance which are in
 dependent of the cosmic distance ladder. This opens up new ways of measuri
 ng cosmological parameters\, with particular focus on the Hubble constant\
 , with the hopes of arbitrating the current tension. In order for this mea
 surement to be made\, additional redshift information is required\, and in
  the case where the merger is observed without a confirmed electromagnetic
  counterpart - true for all but one of the 90 detections to date - galaxy 
 catalogues can be used to provide the redshifts of possible host galaxies.
  Here I will introduce the "dark siren" method\, then discuss how some of 
 the difficulties of this analysis - including galaxy catalogue incompleten
 ess\, unreliable redshift estimates\, and the impact population assumption
 s - are handled\, as well as looking at the most recent results.
LOCATION:Potter room/Zoom
END:VEVENT
END:VCALENDAR