http://arxiv.org/abs/2004.10743
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 $10^{-21} \, \rm eV$.
Y. Nakai, R. Namba and Z. Wang
Thu, 23 Apr 20
44/45
Comments: 24 pages, 2 figures
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