Cosmology with Dark Sirens - Attempting to Solve the Hubble Constant Tension

Explore the use of gravitational waves in cosmology and the challenges of measuring the Hubble constant in this 43-minute conference talk by Rachel Gray from Queen Mary University of London. Delve into the concept of dark sirens and their potential to resolve the Hubble constant tension. Examine the Bayesian approach to cosmological parameter estimation using gravitational wave signals from compact mergers. Investigate the complexities of using galaxy catalogues for redshift information, including issues of incompleteness and the impact of gravitational wave population assumptions. Learn about the pixelation analysis technique and its effects on cosmological inferences. Discover the correlation between population and cosmological parameters, and review the latest cosmology results from GWTC-3.

Intro
Outline
Why use gravitational waves for cosmology?
Cosmology with standard sirens
A Bayesian approach
GW selection effects
An example with 250 (mock) binary neutron stara
What if the host galaxy is not in the catalogue?
The impact of incompleteness
Measuring the Hubble constant with real data
Probability that the host galaxy is in the catalogu
The problem with real galaxy catalogues
Pixelating the analysis
Impact of pixelation on a single event
How much does pixelation improve things?
What is the mass distribution of the BBH popu.
Correlation between population and cosmolog. parameters
Cosmology results from GWTC-3