Abstract:We present a mechanism for generating ultralight dark photon dark matter in the early Universe via a dilatonlike scalar field coupled to the dark photon's kinetic term. Energy is initially stored in the condensate of the dilaton, which resonantly produces dark photons when it begins oscillating in the early Universe. While similar scenarios with axion-dark-photon couplings require large coupling coefficients to fully populate the dark photon, the dilatonic coupling features a unique regime: when the dark photo… Show more
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