Freeze-in production of scalaron dark matter in $f(R)$ gravity
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| Main Authors: | , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866918273599143936 |
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| author | Barman, Basabendu Das, Ashmita SivaKumar, Rakesh Kumar Udgata, Rudra Pratap |
| author_facet | Barman, Basabendu Das, Ashmita SivaKumar, Rakesh Kumar Udgata, Rudra Pratap |
| contents | We demonstrate that the scalaron, a scalar degree of freedom, emerging from the $f(R)$ theory of gravity, can account for the observed dark matter (DM) abundance if its mass is around the MeV scale, to ensure its cosmological stability. Focusing on two well-known $f(R)$ gravity models, we systematically show that if scalaron production proceeds via the freeze-in mechanism, the right relic abundance is satisfied over a very narrow window of reheating temperature $10^{14}\lesssim T_{\rm rh}\lesssim 10^{16}$ GeV. We delineate the viable parameter space of the $f(R)$ models consistent with the observed DM abundance, and highlight relevant experimental constraints from searches targeting DM decay signatures. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_06436 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Freeze-in production of scalaron dark matter in $f(R)$ gravity Barman, Basabendu Das, Ashmita SivaKumar, Rakesh Kumar Udgata, Rudra Pratap High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics High Energy Physics - Theory We demonstrate that the scalaron, a scalar degree of freedom, emerging from the $f(R)$ theory of gravity, can account for the observed dark matter (DM) abundance if its mass is around the MeV scale, to ensure its cosmological stability. Focusing on two well-known $f(R)$ gravity models, we systematically show that if scalaron production proceeds via the freeze-in mechanism, the right relic abundance is satisfied over a very narrow window of reheating temperature $10^{14}\lesssim T_{\rm rh}\lesssim 10^{16}$ GeV. We delineate the viable parameter space of the $f(R)$ models consistent with the observed DM abundance, and highlight relevant experimental constraints from searches targeting DM decay signatures. |
| title | Freeze-in production of scalaron dark matter in $f(R)$ gravity |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics High Energy Physics - Theory |
| url | https://arxiv.org/abs/2506.06436 |