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Detectable and Defect-Free Dark Photon Dark Matter.

David Cyncynates1, Zachary J Weiner1

  • 1University of Washington, Department of Physics, Seattle, Washington 98195, USA.

Physical Review Letters
|June 18, 2025
PubMed
Summary

Ultralight dark photons are promising dark matter candidates. This study presents a new model for their production, evading current constraints and enabling detection in future experiments.

Area of Science:

  • Cosmology
  • Particle Physics
  • Astrophysics

Background:

  • Ultralight dark photons are theoretically compelling dark matter candidates.
  • Existing constraints on kinetic mixing limit minimal production scenarios, challenging direct detection.
  • Sub-meV dark photon dark matter discovery suggests nonminimal dark sector models.

Purpose of the Study:

  • To propose a novel model for producing cold dark photons.
  • To evade stringent cosmic string network constraints on dark photon kinetic mixing.
  • To enable dark photon dark matter detection across accessible experimental parameter spaces.

Main Methods:

  • Developing a theoretical model for dark photon production dynamics.
  • Analyzing constraints from early Universe cosmology, specifically cosmic string formation.

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  • Investigating signatures in cosmological and small-scale structure formation.

    • Main Results:

    • The proposed model allows for cold dark photon production in parameter spaces viable for future direct detection.
    • It circumvents severe constraints imposed by cosmic string network formation.
    • The production mechanism generates distinct cosmological and small-scale structure signatures.

    Conclusions:

    • This work presents a viable model for ultralight dark photon dark matter.
    • The model offers a pathway for discovery in future direct detection experiments.
    • Associated cosmological signatures could facilitate the identification of this specific production mechanism.