Seria: Seminarium Astrofizyczne

Prelegent i afiliacja: Federico Stachurski University of Glasgow, Scotland

Data: wtorek 29 października, 12:30

Miejsce: ul. Pasteura 7, sala 404 / https:meet.goto.com/NCBJmeetings/seminarium-astrofizyczne

Streszczenie: We present a machine learning approach using normalizing flows for inferring cosmological parameters from gravitational wave events. Our methodology is general to any type of compact binary coalescence event and cosmological model and relies on the generation of training data representing distributions of gravitational wave event parameters. These parameters are conditional on the underlying cosmology and incorporate prior information from galaxy catalogues. We provide an example analysis inferring the Hubble constant using binary black holes detected during the O1, O2, and O3 observational runs conducted by the advanced LIGO/VIRGO gravitational wave detectors.  We obtain a Bayesian posterior on the Hubble constant from which we derive an estimate and 1𝜎 confidence bounds of 𝐻0=74.51+14.80−13.63  km s−1 Mpc−1. We are able to compute this result in 𝒪(1)  s using our trained normalizing flow model.