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arXiv · 2512.09760

Reconciling ALP Dark Matter and Electroweak Baryogenesis through First-Order Electroweak Phase Transition

Dipendu Bhandari·Soumen Kumar Manna·Arunansu Sil
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Abstract

We show that an axionlike particle (ALP) can simultaneously generate the baryon asymmetry and constitute dark matter through dynamics triggered by a first-order electroweak phase transition (EWPT). In our proposal, the transition briefly reshapes the ALP potential via a temperature-dependent vacuum expectation value of a scalar field $S$, responsible for making the EWPT of first order, inducing a transient mass enhancement of ALP via higher-dimensional $U(1)$-breaking operator(s). This sudden kick generates a large ALP velocity near the onset of EWPT enabling the broadening of relic satisfied parameter space and predict a complementary stochastic gravitational-wave signal from the underlying first-order transition. We further show that the same ALP dynamics can naturally fuel electroweak baryogenesis through its coupling to electroweak anomaly.

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Dipendu Bhandari, Soumen Kumar Manna, Arunansu Sil. 2025-12-10. Reconciling ALP Dark Matter and Electroweak Baryogenesis through First-Order Electroweak Phase Transition. https://arxiv.org/abs/2512.09760

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