Leptogenesis from Dark Matter Coannihilation
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866911461873287168 |
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| author | Arora, Simran Borah, Debasish Dasgupta, Arnab Dev, P. S. Bhupal Mahanta, Devabrat |
| author_facet | Arora, Simran Borah, Debasish Dasgupta, Arnab Dev, P. S. Bhupal Mahanta, Devabrat |
| contents | We propose a minimal extension of the type-I seesaw model to realise leptogenesis from the co-annihilation of dark sector particles. The type-I seesaw model is extended with a singlet fermion and two singlet scalars charged under a $Z_{2}$ symmetry. The $Z_{2}$-odd singlet scalar is the dark matter candidate. Here the usual type-I seesaw mechanism generates neutrino mass, and a net lepton asymmetry is generated from the co-annihilation of the dark matter and the $Z_2$-odd singlet fermion. The $Z_{2}$-even singlet scalar is important in dark matter phenomenology. Successful leptogenesis is possible at TeV-scale, unlike the vanilla case. This minimal extension provides an elegant explanation of successful leptogenesis with direct connection to the dark matter abundance in the Universe. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2509_12333 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Leptogenesis from Dark Matter Coannihilation Arora, Simran Borah, Debasish Dasgupta, Arnab Dev, P. S. Bhupal Mahanta, Devabrat High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics We propose a minimal extension of the type-I seesaw model to realise leptogenesis from the co-annihilation of dark sector particles. The type-I seesaw model is extended with a singlet fermion and two singlet scalars charged under a $Z_{2}$ symmetry. The $Z_{2}$-odd singlet scalar is the dark matter candidate. Here the usual type-I seesaw mechanism generates neutrino mass, and a net lepton asymmetry is generated from the co-annihilation of the dark matter and the $Z_2$-odd singlet fermion. The $Z_{2}$-even singlet scalar is important in dark matter phenomenology. Successful leptogenesis is possible at TeV-scale, unlike the vanilla case. This minimal extension provides an elegant explanation of successful leptogenesis with direct connection to the dark matter abundance in the Universe. |
| title | Leptogenesis from Dark Matter Coannihilation |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2509.12333 |