Inflationary Particle Production and Implications for WIMP Substructure
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arXiv
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866911439026913280 |
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| author | Olea-Romacho, María Olalla |
| author_facet | Olea-Romacho, María Olalla |
| contents | We explore the observational consequences of resonant particle production during inflation, focusing on its impact on dark matter annihilation signals today. A transient burst of particle production generates localised features in the primordial power spectrum, enhancing the formation of compact small-scale dark matter structures known as prompt cusps. If dark matter consists of thermal WIMPs, the resulting small-scale structures substantially boost annihilation rates, leaving potentially detectable imprints in gamma-ray observations. Using 15 years of Fermi-LAT data targeting the Virgo cluster, we derive upper limits on the thermally averaged annihilation cross section $\langle σv \rangle$, connecting inflationary particle production in the early universe with present-day observations constraining dark matter annihilation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_05240 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Inflationary Particle Production and Implications for WIMP Substructure Olea-Romacho, María Olalla High Energy Physics - Phenomenology We explore the observational consequences of resonant particle production during inflation, focusing on its impact on dark matter annihilation signals today. A transient burst of particle production generates localised features in the primordial power spectrum, enhancing the formation of compact small-scale dark matter structures known as prompt cusps. If dark matter consists of thermal WIMPs, the resulting small-scale structures substantially boost annihilation rates, leaving potentially detectable imprints in gamma-ray observations. Using 15 years of Fermi-LAT data targeting the Virgo cluster, we derive upper limits on the thermally averaged annihilation cross section $\langle σv \rangle$, connecting inflationary particle production in the early universe with present-day observations constraining dark matter annihilation. |
| title | Inflationary Particle Production and Implications for WIMP Substructure |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2511.05240 |