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Maximum Redshift of Gravitational Wave Merger Events
Savvas M Koushiappas1, Abraham Loeb2
1Department of Physics, Brown University, 182 Hope St., Providence, Rhode Island 02912, USA and Institute for Theory and Computation, Harvard University, 60 Garden Street, Cambridge, Massachusetts 02138, USA.
Abstract:
Future generations of gravitational wave detectors will have the sensitivity to detect gravitational wave events at redshifts far beyond any detectable electromagnetic sources. We show that if the observed event rate is greater than one event per year at redshifts z≥40, then the probability distribution of primordial density fluctuations must be significantly non-Gaussian or the events originate from primordial black holes. The nature of the excess events can be determined from the redshift distribution of the merger rate.
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