Axion-like relics: new constraints from old comagnetometer data

Itay M. Bloch*, Yonit Hochberg, Eric Kuflik, Tomer Volansky

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

45 Scopus citations


The noble-alkali comagnetometer, developed in recent years, has been shown to be a very accurate measuring device of anomalous magnetic-like fields. An ultra-light relic axion-like particle can source an anomalous field that permeates space, allowing for its detection by comagnetometers. Here we derive new constraints on relic axion-like particles interaction with neutrons and electrons from old comagnetometer data. We show that the decade-old experimental data place the most stringent terrestrial constraints to date on ultra-light axion-like particles coupled to neutrons. The constraints are comparable to those from stellar cooling, providing a complementary probe. Future planned improvements of comagnetometer measurements through altered geometry, constituent content and data analysis techniques could enhance the sensitivity to axion-like relics coupled to nucleons or electrons by many orders of magnitude.

Original languageEnglish
Article number167
JournalJournal of High Energy Physics
Issue number1
StatePublished - 1 Jan 2020


FundersFunder number
Creative Commons Attribution License
Horizon 2020 Framework Programme682676


    • Dark Matter and Double Beta Decay (experiments)
    • Dark matter


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