Minimal Dark Matter Freeze-in with Low Reheating Temperatures and Implications for Direct Detection
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866912609087782912 |
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| author | Boddy, Kimberly K. Freese, Katherine Montefalcone, Gabriele Haghi, Barmak Shams Es |
| author_facet | Boddy, Kimberly K. Freese, Katherine Montefalcone, Gabriele Haghi, Barmak Shams Es |
| contents | We investigate the influence of the reheating temperature of the visible sector on the freeze-in dark matter (DM) benchmark model for direct detection experiments, where DM production is mediated by an ultralight dark photon. Here we consider a new regime for this benchmark: we take the initial temperature of the thermal Standard Model (SM) bath to be below the DM mass. The production rate from the SM bath is drastically reduced due to Boltzmann suppression, necessitating a significant increase in the portal coupling between DM and the SM to match the observed relic DM abundance. This enhancement in coupling strength increases the predicted DM-electron scattering cross section, making freeze-in DM more accessible to current direct detection experiments. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_06226 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Minimal Dark Matter Freeze-in with Low Reheating Temperatures and Implications for Direct Detection Boddy, Kimberly K. Freese, Katherine Montefalcone, Gabriele Haghi, Barmak Shams Es High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics High Energy Physics - Experiment We investigate the influence of the reheating temperature of the visible sector on the freeze-in dark matter (DM) benchmark model for direct detection experiments, where DM production is mediated by an ultralight dark photon. Here we consider a new regime for this benchmark: we take the initial temperature of the thermal Standard Model (SM) bath to be below the DM mass. The production rate from the SM bath is drastically reduced due to Boltzmann suppression, necessitating a significant increase in the portal coupling between DM and the SM to match the observed relic DM abundance. This enhancement in coupling strength increases the predicted DM-electron scattering cross section, making freeze-in DM more accessible to current direct detection experiments. |
| title | Minimal Dark Matter Freeze-in with Low Reheating Temperatures and Implications for Direct Detection |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2405.06226 |