Dark matter production via a non-minimal coupling to gravity
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arXiv
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| Hauptverfasser: | , , |
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| Format: | Preprint |
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2022
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| _version_ | 1866909916079325184 |
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| author | Lebedev, Oleg Solomko, Timofey Yoon, Jong-Hyun |
| author_facet | Lebedev, Oleg Solomko, Timofey Yoon, Jong-Hyun |
| contents | We study postinflationary scalar dark matter production via its non-minimal coupling to gravity. During the inflaton oscillation epoch, dark matter is produced resonantly for a sufficiently large non-minimal coupling $ξ\gtrsim 5$. We find that backreaction on the curvature and rescattering effects typically become important for the values of $ξ$ above $30$, which invalidate simple estimates of the production efficiency. At large couplings, the dark matter yield becomes almost independent of $ξ$, signifying approximate quasi-equilibrium in the inflaton-dark matter system. Although the analysis gets complicated by the presence of apparent negative energy in the Jordan frame, this behaviour can be regularized by introducing mild dark matter self-interaction. Using lattice simulations, we delineate parameter space leading to the correct dark matter relic abundance. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2211_11773 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Dark matter production via a non-minimal coupling to gravity Lebedev, Oleg Solomko, Timofey Yoon, Jong-Hyun High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology We study postinflationary scalar dark matter production via its non-minimal coupling to gravity. During the inflaton oscillation epoch, dark matter is produced resonantly for a sufficiently large non-minimal coupling $ξ\gtrsim 5$. We find that backreaction on the curvature and rescattering effects typically become important for the values of $ξ$ above $30$, which invalidate simple estimates of the production efficiency. At large couplings, the dark matter yield becomes almost independent of $ξ$, signifying approximate quasi-equilibrium in the inflaton-dark matter system. Although the analysis gets complicated by the presence of apparent negative energy in the Jordan frame, this behaviour can be regularized by introducing mild dark matter self-interaction. Using lattice simulations, we delineate parameter space leading to the correct dark matter relic abundance. |
| title | Dark matter production via a non-minimal coupling to gravity |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2211.11773 |