Late time cosmology with LISA: probing the cosmic expansion with massive black hole binary mergers as standard sirens

TL;DR

This paper explores how the LISA gravitational wave observatory can measure the universe's expansion by using signals from massive black hole mergers as standard sirens, providing a new method for cosmological studies.

Contribution

It reviews the potential of LISA to constrain cosmological parameters through gravitational wave standard sirens and summarizes methodologies and results demonstrating this capability.

Findings

LISA can significantly improve constraints on cosmic expansion.

Massive black hole mergers serve as effective standard sirens.

LISA's measurements complement existing cosmological probes.

Abstract

This paper summarises the potential of the LISA mission to constrain the expansion history of the universe using massive black hole binary mergers as gravitational wave standard sirens. After briefly reviewing the concept of standard siren, the analysis and methodologies of Ref. [1] are briefly outlined to show how LISA can be used as a cosmological probe, while a selection of results taken from Refs. [1,2] is presented in order to estimate the power of LISA in constraining cosmological parameters.