# Gravitational wave probes of extreme gravity: from black holes to cosmology

### APA

Shiralilou, B. (2022). Gravitational wave probes of extreme gravity: from black holes to cosmology. Perimeter Institute. https://pirsa.org/22120068

### MLA

Shiralilou, Banafshe. Gravitational wave probes of extreme gravity: from black holes to cosmology. Perimeter Institute, Dec. 15, 2022, https://pirsa.org/22120068

### BibTex

@misc{ pirsa_22120068, doi = {10.48660/22120068}, url = {https://pirsa.org/22120068}, author = {Shiralilou, Banafshe}, keywords = {Strong Gravity}, language = {en}, title = {Gravitational wave probes of extreme gravity: from black holes to cosmology}, publisher = {Perimeter Institute}, year = {2022}, month = {dec}, note = {PIRSA:22120068 see, \url{https://pirsa.org}} }

Banafshe Shiralilou University of Amsterdam

## Abstract

Gravitational waves emitted by compact binaries enable unprecedented tests of gravity at highly non-linear regimes, as well as the underlying cosmological model. Going beyond the current null tests of gravity requires accurate theoretical modelling of the waveforms in viable extensions of General Relativity. In the first part of this talk, I will present the recent results and physical insights from analytical modelling of the gravitational waves in the so-called Einstein-scalar-Gauss-Bonnet gravity. Being a sub-class of both Horndeski and quadratic gravity, this theory introduces non-linear curvature corrections to strong-field regime of gravity, allows for hairy-black hole solutions, and scalar-induced tidal deformations. I will present the gravitational-wave signatures of theory’s curvature corrections and the prospects of testing the features of this theory through gravitational wave observations. In the second part of the talk, I will discuss the prospects of using compact mergers for cosmological tests by solely relying on their gravitational wave signals. Using recent constraints on the equation-of-state of neutron stars from multi-messenger observations of NICER and LIGO/Virgo, I show possible bounds on the Hubble constant (H0) found from (single and multiple) neutron star-black hole standard sirens in the next-generation gravitational wave detector era. I show that such systems could enable unbiased 13% - 4% precision measurement of H0 (68% credible interval) within an observation time-frame of hours to a day.

Zoom link: https://pitp.zoom.us/j/93964588227?pwd=cGsxcEZHRlNjd3R5eHg5dzdtT2lndz09