Freeze-in Axion-like Dark Matter

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.

arXiv comment1+14 pages; v2: updated ALP longevity bound from gamma ray observations, references added, version to appear in PLB

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Cited by in corpus (11)

• Seven hints that early-time new physics alone is not sufficient to solve the Hubble tension
• Relativistic Freeze-in
• Effects of the Axion Through the Higgs Portal on Primordial Gravitational Waves During the Electroweak Breaking
• Electroweak baryogenesis by axionlike dark matter
• Axion dark matter with thermal friction
• Axion-driven hybrid inflation over a barrier
• Freezing In with Lepton Flavored Fermions
• Resonant ALP-Portal Dark Matter Annihilation as a Solution to the $B^{\pm }\to K^{\pm }\nu \bar{\nu }$ Excess
• Collider fingerprints of freeze-in dark matter produced during the fast expansion phase of Universe
• Exploring the viability of pseudo Nambu-Goldstone boson as ultralight dark matter in a mass range relevant for strong gravity applications
• Structure Formation Limits on Axion-Like Dark Matter