Cosmological constraints on mass-varying dark matter
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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_ | 1866913767330152448 |
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| author | Chakraborty, Amlan Das, Anirban Das, Subinoy Sethi, Shiv K. |
| author_facet | Chakraborty, Amlan Das, Anirban Das, Subinoy Sethi, Shiv K. |
| contents | As one of the fundamental unknowns of our Universe, the mass of dark matter remains to be a topic of great interest. We consider the possibility of a time-variation of the dark matter mass. We study the cosmological constraints on a model where the dark matter mass transitions from zero to a finite value in the early Universe. In this model, the matter power spectrum exhibits power suppression below a certain scale that depends on the epoch of transition, and the angular power spectrum of the cosmic microwave background shows a distinctive phase shift and power suppression at small scales. We use the latest cosmic microwave background data and the $S_8$ priors from weak lensing data to place a lower limit on the transition redshift. We also find that the data from the ACT show a mild preference for the mass-varying dark matter model over $Λ$CDM. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2405_08476 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Cosmological constraints on mass-varying dark matter Chakraborty, Amlan Das, Anirban Das, Subinoy Sethi, Shiv K. Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology As one of the fundamental unknowns of our Universe, the mass of dark matter remains to be a topic of great interest. We consider the possibility of a time-variation of the dark matter mass. We study the cosmological constraints on a model where the dark matter mass transitions from zero to a finite value in the early Universe. In this model, the matter power spectrum exhibits power suppression below a certain scale that depends on the epoch of transition, and the angular power spectrum of the cosmic microwave background shows a distinctive phase shift and power suppression at small scales. We use the latest cosmic microwave background data and the $S_8$ priors from weak lensing data to place a lower limit on the transition redshift. We also find that the data from the ACT show a mild preference for the mass-varying dark matter model over $Λ$CDM. |
| title | Cosmological constraints on mass-varying dark matter |
| topic | Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2405.08476 |