Estimating Hubble Constant with Gravitational Observations: A Concise Review

TL;DR

This review discusses gravitational wave methods for estimating the Hubble constant, highlighting recent results and the tension between different measurement techniques in cosmology.

Contribution

It provides a comprehensive overview of gravitational observation methods for the Hubble constant, including bright and dark sirens, and summarizes current state-of-the-art findings.

Findings

Gravitational wave observations offer an independent way to estimate the Hubble constant.

Recent measurements show a tension between CMB and supernovae derived values.

Gravitational methods are advancing towards more precise cosmological parameter estimation.

Abstract

The Hubble constant is of paramount importance in astrophysics and cosmology. A large number of methods have been developed with different electromagnetic probes to estimate its value. The most recent results show a tension between values obtained from Cosmic Microwave Background observations and supernovae. The simultaneous detection of gravitational waves and electromagnetic radiation from GW170817 provided a direct estimation of the Hubble constant that did not depend on the astronomical distance ladder. This concise review will present the methods to estimate the Hubble constant with the gravitational observations of compact binary mergers, discussing both bright and dark sirens and reporting the state of the art of the results.