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Paper detail

Light Dark Matter and Superfluid He-4 from EFT

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.

preprint2019arXivOpen access
Andrea CaputoAngelo EspositoAntonio D. Polosa
astro-ph.COhep-ph
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Andrea CaputoAngelo EspositoAntonio D. Polosa

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