Cosmology with the lights off: Standard sirens in the Einstein Telescope era
Stephen R. Taylor, Jonathan R. Gair

TL;DR
This paper assesses how the Einstein Telescope's gravitational-wave observations of neutron-star binaries can precisely measure cosmological parameters and astrophysical properties, surpassing current methods with tens of thousands of detections.
Contribution
It demonstrates that ET can constrain cosmological and astrophysical parameters with high precision using gravitational-wave data, providing insights beyond traditional electromagnetic observations.
Findings
ET could detect tens of thousands of DNS binaries annually.
Cosmological parameters could be constrained to similar accuracy as future electromagnetic surveys.
Astrophysical parameters like delay-time distribution could be measured within ~10%.
Abstract
We explore the prospects for constraining cosmology using gravitational-wave (GW) observations of neutron-star binaries by the proposed Einstein Telescope (ET), exploiting the narrowness of the neutron-star mass function. Double neutron-star (DNS) binaries are expected to be one of the first sources detected after "first-light" of Advanced LIGO and are expected to be detected at a rate of a few tens per year in the advanced era. However the proposed ET could catalog tens of thousands per year. Combining the measured source redshift distributions with GW-network distance determinations will permit not only the precision measurement of background cosmological parameters, but will provide an insight into the astrophysical properties of these DNS systems. Of particular interest will be to probe the distribution of delay times between DNS-binary creation and subsequent merger, as well as the…
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