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arXiv · 1907.07383

Freeze-in Axion-like Dark Matter

Sang Hui Im·Kwang Sik Jeong
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Abstract

We present an interesting Higgs portal model where an axion-like particle (ALP) couples to the Standard Model sector only via the Higgs field. The ALP becomes stable due to CP invariance and turns out to be a natural candidate for freeze-in dark matter because its properties are controlled by the perturbative ALP shift symmetry. The portal coupling can be generated non-perturbatively by a hidden confining gauge sector, or radiatively by new leptons charged under the ALP shift symmetry. Such UV completions generally involve a CP violating phase, which makes the ALP unstable and decay through mixing with the Higgs boson, but can be sufficiently suppressed in a natural way by invoking additional symmetries.

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Sang Hui Im, Kwang Sik Jeong. 2019-10-29. Freeze-in Axion-like Dark Matter. https://doi.org/10.1016/j.physletb.2019.135044

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