Scalar metric perturbations after inflation break conformal invariance and induce quantum production of gravitons, generating a GW spectrum that peaks near GHz frequencies for standard primordial scalar power spectra.
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Derives expressions connecting particle production from metric perturbations to the stress-energy tensor correlator and establishes a phenomenological link between dark matter yield and stochastic gravitational wave background amplitude for sub-horizon sources.
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Quantum production of gravitational waves after inflation
Scalar metric perturbations after inflation break conformal invariance and induce quantum production of gravitons, generating a GW spectrum that peaks near GHz frequencies for standard primordial scalar power spectra.
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Particle Production from Inhomogeneities: the off-shell side of gravitational waves
Derives expressions connecting particle production from metric perturbations to the stress-energy tensor correlator and establishes a phenomenological link between dark matter yield and stochastic gravitational wave background amplitude for sub-horizon sources.