Determination of Dark Energy by the Einstein Telescope: Comparing with CMB, BAO and SNIa Observations

By Wen Zhao, C. Broeck, D. Baskaran, T. Li. 2010

169 citations recorded by the source corpus.

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 $z\ensuremath{\sim}2$. If binary neutron star mergers are the progenitors of short-hard $\ensuremath{\gamma}$-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 $\ensuremath{\Lambda}\mathrm{CDM}$ 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 ${w}_{0}$) 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 ${w}_{0}$ and ${w}_{a}$ with accuracies $\ensuremath{\Delta}{w}_{0}=0.099$ and $\ensuremath{\Delta}{w}_{a}=0.302$, respectively. These results are compared with projected accuracies for the JDEM baryon acoustic oscillations project and the SNAP type Ia supernovae observations.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/22bf40f6cecac188bb48143a1ec2edf4c48867d0

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In Astronomy and Astrophysics

Citations in the corpus

Testing modified gravity at cosmological distances with LISA standard sirens (2019, background): “quation of state), in the scalar perturbation sector, and in the tensor perturbation sector. Concerning the background modications, as encoded for instance in the (w0;wa) parameters, several studies [16,27,28,35] have shown that the accuracy that LISA, or third-generation ground-based interferometer”
Science with the space-based interferometer eLISA. III: probing the expansion of the universe using gravitational wave standard sirens (2016, methodology): “for the Einstein Telescope in [44], for SNIa in [45], and for BAO in [46].”
Science case for the Einstein telescope (2019, background): “1), which would allow us to obtain a measurement of the dark energy equation of state from GW observations [195–197].”