Dark photon dark matter from an oscillating dilaton

Peter Adshead, Kaloian D. Lozanov, Zachary J. Weiner

Research output: Contribution to journalArticlepeer-review


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 photon's mass is half that of the dilaton, dark photons are copiously produced even when the dilaton undergoes small-amplitude oscillations. Scenarios consistent with the cosmic microwave background allow for ultralight vector dark matter with mass as light as 10-20 eV.

Original languageEnglish (US)
Article number083519
JournalPhysical Review D
Issue number8
StatePublished - Apr 15 2023
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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