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Gravitational Wave Cosmology
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Since their first detection in 2015, gravitational wave observations have enabled a variety of studies, ranging from stellar evolution to fundamental physics. In this chapter, we focus on their use as "standard sirens", describing the different methodologies that can be adopted to measure cosmological parameters with compact object binaries from ground-based gravitational wave detectors. We cover the three main classes of standard siren measurements, showing how the expansion of the Universe can be constrained through Bayesian statistics both with gravitational wave observations alone and with the aid of electromagnetic emission from the electromagnetic counterpart of gravitational wave events and from galaxies. Finally, we summarize the existing measurements and prospects for future constraints on cosmological parameters.
Forward citations
Cited by 3 Pith papers
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Rapid Hubble constant inference from GW170817 using GPU-accelerated nested sampling: prior sensitivity and the limits of post-hoc reweighting
GPU-accelerated nested sampling on GW170817 demonstrates that switching to a uniform-in-dL prior shifts the H0 tail and median far more than post-hoc reweighting captures, due to an under-sampled (dL, iota) bimodality.
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Spectral siren cosmology from gravitational-wave observations in GWTC-4.0
Spectral siren analysis of 152 GWTC-4.0 black hole mergers with a Gaussian Process mass model, combined with GW170817, gives H0 = 69 (+7/-6) km/s/Mpc at 10% precision.
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The road towards precision measurements of $H_0$ with bright sirens in the Einstein Telescope era
Under simulated Einstein Telescope bright-siren catalogues, ~90 low-redshift events reach σ_H0≈1 km/s/Mpc alone; with BAO, ~20 suffice.
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