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Determination of dark energy by the Einstein Telescope: Comparing with CMB, BAO, and SNIa observations

W. Zhao1, C. Van Den Broeck2, D. Baskaran1, and T. G. F. Li2

  • 1School of Physics and Astronomy, Cardiff University, Cardiff, CF24 3AA, United Kingdom
  • 2Nikhef – National Institute for Subatomic Physics, Science Park 105, 1098 XG Amsterdam, The Netherlands

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Phys. Rev. D 83, 023005 – Published 11 January, 2011

DOI: https://doi.org/10.1103/PhysRevD.83.023005

Abstract

A design study is currently in progress for a third-generation gravitational-wave (GW) detector called the Einstein Telescope (ET). An important kind of source for ET will be the inspiral and merger of binary neutron stars up to z∼2. If binary neutron star mergers are the progenitors of short-hard γ-ray bursts, then some fraction of them will be seen both electromagnetically and through GW, so that the luminosity distance and the redshift of the source can be determined separately. An important property of these “standard sirens” is that they are self-calibrating: the luminosity distance can be inferred directly from the GW signal, with no need for a cosmic distance ladder. Thus, standard sirens will provide a powerful independent check of the ΛCDM model. In previous work, estimates were made of how well ET would be able to measure a subset of the cosmological parameters (such as the dark energy parameter w0) it will have access to, assuming that the others had been determined to great accuracy by alternative means. Here we perform a more careful analysis by explicitly using the potential Planck cosmic microwave background data as prior information for these other parameters. We find that ET will be able to constrain w0 and wa with accuracies Δw0=0.099 and Δwa=0.302, respectively. These results are compared with projected accuracies for the JDEM baryon acoustic oscillations project and the SNAP type Ia supernovae observations.

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Phys. Rev. D 83, 023005– Published 11 January, 2011
  • Received 1 September 2010
Article part of CHORUS

© 2011 The American Physical Society

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