# EPS-HEP2021 conference

26-30 July 2021
Zoom
Europe/Berlin timezone

## Probing the standard cosmological model with the population of binary black-holes

26 Jul 2021, 15:55
20m
Zoom

#### Zoom

Parallel session talk Astroparticle and Gravitational Waves

### Speaker

Jose María Ezquiaga (University of Chicago)

### Description

Gravitational-wave (GW) detections are rapidly increasing in number, enabling precise statistical analyses of the population of compact binaries. In this talk I will show how these population analyses cannot only serve to constrain the astrophysical formation channels, but also to learn about cosmology. The three key observables are the number of events as a function of luminosity distance, the stochastic GW background of unresolved binaries and the location of any feature in the source mass distribution, such as the expected pair instability supernova (PISN) gap. Given data from LIGO-Virgo observations, I will present constraints in cosmological modifications of gravity. I will also discuss future prospects on measuring $H_0$ given a possible population of black holes above the PISN gap. These novel tests of the standard cosmological model require GW data only and will become increasingly relevant as GW catalogs grow, specially if multi-messenger events remain elusive.

Collaboration / Activity University of Chicago ezquiaga@uchicago.edu Jose María Ezquiaga

### Primary author

Jose María Ezquiaga (University of Chicago)