Cosmography with the Einstein Telescope

B S Sathyaprakash (1) , B F Schutz (2) , C van den Broeck (3)

1 School of Physics and Astronomy [Cardiff]
2 AEI - Max Planck Institute for Gravitational Physics (Albert Einstein Institute)
3 NIKHEF - National Institute for Subatomic Physics [Amsterdam]

Einstein Telescope (ET), a 3rd generation gravitational-wave detector under design study, could detect millions of binary neutron star inspirals each year. A small fraction of these events might be observed as gamma-ray bursts, helping to measure both the luminosity distance D L to and red-shift z of the source. By fitting these measured values of D L and z to a cosmological model, it should be possible to infer the dark energy equation-of-state to within 1.5% without the need to correct for errors in D L caused by weak lensing. This compares favorably with the 0.3-10% percent accuracy that can be achieved with LISA (where weak lensing will need to be dealt with), as well as with dedicated dark energy missions that have been proposed, where 3.5-11% uncertainty is expected.

Mots clés: 04.30.Db; 04.25.Nx; 04.80.Nn; 95.55.Ym

B S Sathyaprakash, B F Schutz, C van den Broeck. Cosmography with the Einstein Telescope. Classical and Quantum Gravity, 2010, 27 (21), pp.215006. ⟨10.1088/0264-9381/27/21/215006⟩. ⟨hal-00638668⟩