Abstract
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 eV.
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Nakai, Y., Namba, R. & Wang, Z. Light dark photon dark matter from inflation. J. High Energ. Phys. 2020, 170 (2020). https://doi.org/10.1007/JHEP12(2020)170
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DOI: https://doi.org/10.1007/JHEP12(2020)170