Light Dark Matter and Superfluid He-4 from EFT

Abstract

We study the response of a He-4 detector to the interaction of sub-GeV dark matter using an effective field theory for the superfluid. We compute the lifetime of the phonon, which agrees with what known from standard techniques, hence providing an important check of the effective field theory. We then study the process of emission of two phonons, and show how its rate is much more suppressed than the phase space expectations; this is a consequence of the conservation of the current associated to the superfluid symmetries.

arXiv commentTalk presented at the TAUP 2019 conference; 4 pages, 2 figures

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Cited by in corpus (6)

• Searches for light dark matter using condensed matter systems
• Searching for low mass dark matter via phonon creation in superfluid 4He
• Directional detection of light dark matter from three-phonon events in superfluid ${}^4$He
• Cosmology and prospects for sub-MeV dark matter in electron recoil experiments
• Signatures and Detection Prospects for sub-GeV Dark Matter with Superfluid Helium
• Superfluid Effective Field Theory for Dark Matter Direct Detection