Gravitation group Seminar: Rachel Gray - Cosmology with Dark Sirens and Galaxy Catalogues

Dear all,

On Monday, October 17 at 10.00 we will be welcoming Rachel Gray (Queen Mary University of London) for the gravitation group seminar. The seminar will take place online - the zoom link can be found below.

Rachel will talk about cosmological constraints from gravitational wave dark sirens and galaxy catalogs. 

Cosmology with Dark Sirens and Galaxy Catalogues

Gravitational wave signals from compact binaries are of huge interest to the cosmology community due to their ability to act as standard sirens, providing measurements of luminosity distance which are independent of the cosmic distance ladder. This opens up new ways of measuring cosmological parameters, particularly the Hubble constant, with the hopes of arbitrating the current tension. In order for this measurement 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 present the Python software package "gwcosmo", and discuss how many of the difficulties of this analysis - including varying galaxy catalogue incompleteness, systematic effects, and unreliable redshift estimates - are handled, as well as looking at some of the most recent results.

The schedule for upcoming gravitation group seminars can be found here:

We are looking forward to the talk and we hope to see you there! 


Topic: Gravitation Group Seminar
Time: Oct 17, 2022 10:00 AM Paris

Join Zoom Meeting

Meeting ID: 838 2531 3199
Passcode: 474179


Lundi, 17 octobre, 2022 - 10:00 to 11:00

Localisation / Location: 


Salle / Local: 

  • Séminaire

Nom/Prénom // Last name/First name: 

Gray, Rachel


Queen Mary University of London

Equipe(s) organisatrice(s) / Organizing team(s): 

  • Gravitation

Pays / Country: 


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