TL;DR
This paper reviews current observational and theoretical estimates of coalescence rates for compact binary systems, highlighting recent advances and the importance of upcoming surveys for gravitational-wave astronomy.
Contribution
It provides a comprehensive summary of the latest observational constraints and theoretical models of compact binary coalescence rates, emphasizing the current state of knowledge.
Findings
Observational constraints from gravitational-wave detections and electromagnetic observations.
Theoretical models predict a wide range of coalescence rates based on different evolutionary channels.
Upcoming surveys are expected to significantly improve rate estimates.
Abstract
Gravitational-wave detections are enabling measurements of the rate of coalescences of binaries composed of two compact objects -- neutron stars and/or black holes. The coalescence rate of binaries containing neutron stars is further constrained by electromagnetic observations, including Galactic radio binary pulsars and short gamma-ray bursts. Meanwhile, increasingly sophisticated models of compact objects merging through a variety of evolutionary channels produce a range of theoretically predicted rates. Rapid improvements in instrument sensitivity, along with plans for new and improved surveys, make this an opportune time to summarise the existing observational and theoretical knowledge of compact-binary coalescence rates.
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