Cosmography with the Einstein Telescope

TL;DR

The paper discusses how the Einstein Telescope, a future gravitational-wave detector, could revolutionize cosmology by enabling precise measurements of the universe's expansion and dark energy properties through observations of binary mergers.

Contribution

It explores the potential of the Einstein Telescope to perform cosmography by detecting numerous gravitational-wave events and using them to infer key cosmological parameters.

Findings

ET can detect millions of mergers up to high redshifts

Coincident gamma-ray burst observations can provide distance and redshift data

ET could significantly improve constraints on dark energy and dark matter parameters

Abstract

Einstein Telescope (ET) is a 3rd generation gravitational-wave (GW) detector that is currently undergoing a design study. ET can detect millions of compact binary mergers up to redshifts 2-8. A small fraction of mergers might be observed in coincidence as gamma-ray bursts, helping to measure both the luminosity distance and red-shift to the source. By fitting these measured values to a cosmological model, it should be possible to accurately infer the dark energy equation-of-state, dark matter and dark energy density parameters. ET could, therefore, herald a new era in cosmology.