Cosmography with the Einstein Telescope

B. S. Sathyaprakash, B. F. Schutz, C. Van Den Broeck

Research output: Contribution to journalArticlepeer-review

175 Scopus citations


The Einstein Telescope, a third-generation gravitational-wave detector under a 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 DL to and redshift z of the source. By fitting these measured values of DL and z to a cosmological model, it would be possible to infer the dark energy equation of state to within 1.5% without the need to correct for errors in DL caused by weak lensing. This compares favourably with 0.3-10% accuracy that can be achieved with the Laser Interferometer Space Antenna (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.

Original languageEnglish (US)
Article number215006
JournalClassical and Quantum Gravity
Issue number21
StatePublished - Nov 7 2010

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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