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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2508.21121 |
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| _version_ | 1866908508791767040 |
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| author | García-Cely, Camilo Landini, Giacomo Marsili, Luca Zapata, Óscar |
| author_facet | García-Cely, Camilo Landini, Giacomo Marsili, Luca Zapata, Óscar |
| contents | As recently proposed, a non-vanishing topological angle may play a central role in QCD-like theories of dark matter (DM). In this work, we introduce a dark photon portal to the Standard Model in order to establish thermal equilibrium in the early Universe, and discuss the ensuing phenomenological constraints, including the stability of DM. The resulting dynamics accounts for the observed DM relic abundance and yields velocity-dependent DM self-interactions in astrophysical halos. Due to the sharp velocity dependence arising from a Breit-Wigner resonance, dedicated studies are required to assess the gravothermal evolution in detail, especially in the core-collapse regime. This is particularly timely in light of self-interacting DM interpretations of strong-lensing systems such as SDSS J0946+1006, which can be naturally explained within our framework. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_21121 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Pion dark matter in a $θ$ vacuum: a thermal relic with sharp velocity-dependent self-interactions García-Cely, Camilo Landini, Giacomo Marsili, Luca Zapata, Óscar High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies As recently proposed, a non-vanishing topological angle may play a central role in QCD-like theories of dark matter (DM). In this work, we introduce a dark photon portal to the Standard Model in order to establish thermal equilibrium in the early Universe, and discuss the ensuing phenomenological constraints, including the stability of DM. The resulting dynamics accounts for the observed DM relic abundance and yields velocity-dependent DM self-interactions in astrophysical halos. Due to the sharp velocity dependence arising from a Breit-Wigner resonance, dedicated studies are required to assess the gravothermal evolution in detail, especially in the core-collapse regime. This is particularly timely in light of self-interacting DM interpretations of strong-lensing systems such as SDSS J0946+1006, which can be naturally explained within our framework. |
| title | Pion dark matter in a $θ$ vacuum: a thermal relic with sharp velocity-dependent self-interactions |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2508.21121 |