Reconciling ALP Dark Matter and Electroweak Baryogenesis through First-Order Electroweak Phase Transition
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arXiv
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866911311381659648 |
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| author | Bhandari, Dipendu Manna, Soumen Kumar Sil, Arunansu |
| author_facet | Bhandari, Dipendu Manna, Soumen Kumar Sil, Arunansu |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_09760 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Reconciling ALP Dark Matter and Electroweak Baryogenesis through First-Order Electroweak Phase Transition Bhandari, Dipendu Manna, Soumen Kumar Sil, Arunansu High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics High Energy Physics - Theory 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. |
| title | Reconciling ALP Dark Matter and Electroweak Baryogenesis through First-Order Electroweak Phase Transition |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics High Energy Physics - Theory |
| url | https://arxiv.org/abs/2512.09760 |