Speaker
Description
Gravitational waves (GWs) are emerging as a potentially powerful probe of the Universe on large scales. Notably, they may contribute in the coming years to addressing the Hubble tension, as both the number of observed GW events increases and the capacity of current detectors to localise their sources improves. In this talk, I will discuss a new method for measuring the Hubble constant using GWs, based on their 3D cross-correlations with galaxies—known as Peak Sirens. I will present our recent work where we detected for the first time those cross-correlations, at 5.9$\sigma$, with the GWTC-3 and GLADE+ catalogs. We obtained the first measurement of the Hubble constant from this method, and the first bounds whatsoever on the gravitational wave clustering bias. This work opens a new window for analysing GW sources as tracers of the large scale structures.