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Gravitational-Wave Cosmology across 29 Decades in Frequency

Shannon, Ryan M.; Mingarelli, Chiara M. F.; Kerr, Matthew +24 more

Quantum fluctuations of the gravitational field in the early Universe, amplified by inflation, produce a primordial gravitational-wave background across a broad frequency band. We derive constraints on the spectrum of this gravitational radiation, and hence on theories of the early Universe, by combining experiments that cover 29 orders of magnitu…