Completely Dark Photons from Gravitational Particle Production During Inflation

Kavli Affiliate: Edward W. Kolb

| First 5 Authors: Edward W. Kolb, Andrew J. Long, , ,

| Summary:

Starting with the de Broglie–Proca Lagrangian for a massive vector field, we
calculate the number density of particles resulting from gravitational particle
production (GPP) during inflation, with detailed consideration to the evolution
of the number density through the reheating. We find plausible scenarios for
the production of dark-photon dark matter of mass in a wide range, as low as a
micro-electron volt to $10^{14}$ GeV. Gravitational particle production does
not depend on any coupling of the dark photon to standard-model particles.

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