Quantum interference in gravitational particle production

Kavli Affiliate: Edward W. Kolb

| First 5 Authors: Edward Basso, Daniel J. H. Chung, Edward W. Kolb, Andrew J. Long,

| Summary:

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.

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