Axion-like Dark Matter from the Type-II Seesaw Mechanism

Wei Chao; Mingjie Jin; Hai-Jun Li; Ying-Quan Peng

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arXiv · 2210.13233

Axion-like Dark Matter from the Type-II Seesaw Mechanism

Wei Chao·Mingjie Jin·Hai-Jun Li·Ying-Quan Peng

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Abstract

Although axion-like particles (ALPs) are popular dark matter candidates, their mass generation mechanisms as well as cosmic thermal evolutions are still unclear. In this letter, we propose a new mass generation mechanism of ALP during the electroweak phase transition in the presence of the type-II seesaw mechanism. As ALP gets mass uniquely at the electroweak scale, there is a cutoff scale on the ALP oscillation temperature irrelevant to the specific mass of ALP, which is a distinctive feature of this scenario. The ALP couples to the active neutrinos, leaving the matter effect of neutrino oscillations in a dense ALP environment as a smoking gun. As a by-product, the recent $W$-boson mass anomaly observed by the CDF collaboration is also quoted by the TeV-scale type-II seesaw. We explain three kinds of new physics phenomena are with one stroke.

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Wei Chao, Mingjie Jin, Hai-Jun Li, Ying-Quan Peng. 2022-10-24. Axion-like Dark Matter from the Type-II Seesaw Mechanism. https://arxiv.org/abs/2210.13233

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