Thermal effects on Dark Matter production during cosmic reheating
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2026
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| _version_ | 1866911601824628736 |
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| author | Drewes, Marco Georis, Yannis Mohammed, Mubarak A. S. Zell, Sebastian |
| author_facet | Drewes, Marco Georis, Yannis Mohammed, Mubarak A. S. Zell, Sebastian |
| contents | The relic abundance of Dark Matter (DM) produced via thermal freeze-in is sensitive to the thermal history during and after cosmic reheating. In minimal models, this opens up the possibility to make predictions for collider observables by combining the requirement to match the DM relic abundance with observations of the Cosmic Microwave Background (CMB). We assess the impact of thermal corrections to the rate of cosmic reheating and the rate of thermal DM production on CMB observables and the relic abundance. We find that such corrections are generally small in the regime where they can be computed by means of finite-temperature field theory. We construct counter-examples where this general rule is violated. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2604_16085 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Thermal effects on Dark Matter production during cosmic reheating Drewes, Marco Georis, Yannis Mohammed, Mubarak A. S. Zell, Sebastian High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics The relic abundance of Dark Matter (DM) produced via thermal freeze-in is sensitive to the thermal history during and after cosmic reheating. In minimal models, this opens up the possibility to make predictions for collider observables by combining the requirement to match the DM relic abundance with observations of the Cosmic Microwave Background (CMB). We assess the impact of thermal corrections to the rate of cosmic reheating and the rate of thermal DM production on CMB observables and the relic abundance. We find that such corrections are generally small in the regime where they can be computed by means of finite-temperature field theory. We construct counter-examples where this general rule is violated. |
| title | Thermal effects on Dark Matter production during cosmic reheating |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2604.16085 |