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2020

Light Dark Photon Dark Matter from Inflation

Nakai, Yuichiro, Namba, Ryo, Wang, Ziwei

Understand

We discuss the possibility of producing a light dark photon dark matter through a coupling between the dark photon field and the inflaton.

The dark photon with a large wavelength is efficiently produced due to the inflaton motion during inflation and becomes non-relativistic before the time of matter-radiation equality.
We compute the amount of production analytically.
The correct relic abundance is realized with a dark photon mass extending down to $10^{-21} \, \rm eV$.