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Quantum interference in gravitational particle production
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Previous numerical investigations of gravitational particle production during the coherent oscillation period of inflation displayed unexplained fluctuations in the spectral density of the produced particles. We argue that these features are due to the quantum interference of the coherent scattering reactions that produce the particles. We provide accurate analytic formulae to compute the particle production amplitude for a conformally-coupled scalar field, including the interference effect in the kinematic region where the production can be interpreted as inflaton scattering into scalar final states via graviton exchange.
Forward citations
Cited by 3 Pith papers
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Graviton Production from Inflaton Condensate: Boltzmann vs Bogoliubov
For quadratic inflaton potentials Boltzmann and Bogoliubov spectra agree at short wavelengths, but for steeper potentials non-adiabatic transition effects captured only by Bogoliubov are sizable across a broad momentum range.
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Dark Matter Ultraviolet Freeze-in in General Reheating Scenarios
The paper derives analytic dark matter freeze-in yields for arbitrary power-law reheating histories and maps the gravitational production parameter space.
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Aspects of Gravitational Portals and Freeze-in during Reheating
During reheating, freeze-in from the gravitationally produced radiation bath can dominate the dark matter relic density for DM masses above the reheating temperature, with k- and n-dependent constraints.
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