Kavli Affiliate: Daniel E. Holz
| First 5 Authors: Bryce Cousins, Kristen Schumacher, Adrian Ka-Wai Chung, Colm Talbot, Thomas Callister
| Summary:
Gravitational waves from individually resolved compact object mergers can be
used as standard sirens, offering a novel self-calibrating precision probe of
cosmology. While the standard siren method has been well-explored, the
gravitational-wave background arising from unresolved mergers offers a novel
alternative to probing cosmology. We demonstrate that the combination of
resolved binary black hole mergers with the unresolved signals composing the
stochastic gravitational-wave background can be used to measure cosmological
parameters, including the Hubble constant, $H_0$. We apply this “stochastic
siren” method to existing gravitational-wave data and find that including the
current non-detection of the background increases the accuracy at which $H_0$
can be measured, relative to using resolved mergers alone. We also provide
projections for upcoming detectors to highlight their ability to probe
cosmology with the background. With the anticipated detection of the
astrophysical gravitational-wave background, the stochastic siren approach can
be expected to improve future standard siren cosmological measurements.
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