Terrestrial probes of electromagnetically interacting dark radiation

Jui Lin Kuo, Maxim Pospelov, Josef Pradler

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


We study the possibility that dark radiation, sourced through the decay of dark matter in the late Universe, carries electromagnetic interactions. The relativistic flux of particles induces recoil signals in direct detection and neutrino experiments through its interaction with millicharge, electric/magnetic dipole moments, or anapole moment/charge radius. Taking the DM lifetime as 35 times the age of the Universe, as currently cosmologically allowed, we show that direct detection (neutrino) experiments have complementary sensitivity down to ϵ∼10-11 (10-12), dχ/μχ∼10-9μB (10-13μB), and aχ/bχ∼10-2 GeV-2 (10-8 GeV-2) on the respective couplings. Finally, we show that such dark radiation can lead to a satisfactory explanation of the recently observed XENON1T excess in the electron recoil signal without being in conflict with other bounds.

Original languageEnglish (US)
Article number115030
JournalPhysical Review D
Issue number11
StatePublished - Jun 25 2021
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2021 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.


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