Cool dark sector, concordance, and a low $\sigma_8$
| Title: | Cool dark sector, concordance, and a low $\sigma_8$ |
|---|---|
| Authors: | Hughes, Ellie, Ge, Fei, Cyr-Racine, Francis-Yan, Knox, Lloyd, Raghunathan, Srinivasan |
| Source: | Phys. Rev. D 109, 103516 (2024) |
| Publication Year: | 2023 |
| Collection: | Astrophysics High Energy Physics - Phenomenology |
| Subject Terms: | Astrophysics - Cosmology and Nongalactic Astrophysics, High Energy Physics - Phenomenology |
| More Details: | We investigate a cosmological model in which a fraction of the dark matter is atomic dark matter (ADM). This ADM consists of dark versions of the electron and of the proton, interacting with each other and with dark photons just as their light sector versions do, but interacting with everything else only gravitationally. We find constraints given current cosmic microwave background (CMB) and baryon acoustic oscillation (BAO) data, with and without an $H_0$ prior, and with and without enforcing a big bang nucleosynthesis consistent helium abundance. We find that, at low dark photon temperature, one can have consistency with BAO and CMB data, with a fraction of dark matter that is ADM ($f_{\rm adm}$) as large as $\sim 0.1$. Such a large $f_{\rm adm}$ leads to a suppression of density fluctuations today on scales below about 60 Mpc that may be of relevance to the $\sigma_8$ tension. Our work motivates calculation of nonlinear corrections to matter power spectrum predictions in the ADM model. We forecast parameter constraints to come from future ground-based CMB surveys, and find that if ADM is indeed the cause of the $\sigma_8$ tension, the influence of the ADM, primarily on CMB lensing, will likely be detectable at high significance. Comment: 16 pages + references, 9 figures. Published in PRD |
| Document Type: | Working Paper |
| DOI: | 10.1103/PhysRevD.109.103516 |
| Access URL: | http://arxiv.org/abs/2311.05678 |
| Accession Number: | edsarx.2311.05678 |
| Database: | arXiv |
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| Items | – Name: Title Label: Title Group: Ti Data: Cool dark sector, concordance, and a low $\sigma_8$ – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Hughes%2C+Ellie%22">Hughes, Ellie</searchLink><br /><searchLink fieldCode="AR" term="%22Ge%2C+Fei%22">Ge, Fei</searchLink><br /><searchLink fieldCode="AR" term="%22Cyr-Racine%2C+Francis-Yan%22">Cyr-Racine, Francis-Yan</searchLink><br /><searchLink fieldCode="AR" term="%22Knox%2C+Lloyd%22">Knox, Lloyd</searchLink><br /><searchLink fieldCode="AR" term="%22Raghunathan%2C+Srinivasan%22">Raghunathan, Srinivasan</searchLink> – Name: TitleSource Label: Source Group: Src Data: Phys. Rev. D 109, 103516 (2024) – Name: DatePubCY Label: Publication Year Group: Date Data: 2023 – Name: Subset Label: Collection Group: HoldingsInfo Data: Astrophysics<br />High Energy Physics - Phenomenology – Name: Subject Label: Subject Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Astrophysics+-+Cosmology+and+Nongalactic+Astrophysics%22">Astrophysics - Cosmology and Nongalactic Astrophysics</searchLink><br /><searchLink fieldCode="DE" term="%22High+Energy+Physics+-+Phenomenology%22">High Energy Physics - Phenomenology</searchLink> – Name: Abstract Label: Description Group: Ab Data: We investigate a cosmological model in which a fraction of the dark matter is atomic dark matter (ADM). This ADM consists of dark versions of the electron and of the proton, interacting with each other and with dark photons just as their light sector versions do, but interacting with everything else only gravitationally. We find constraints given current cosmic microwave background (CMB) and baryon acoustic oscillation (BAO) data, with and without an $H_0$ prior, and with and without enforcing a big bang nucleosynthesis consistent helium abundance. We find that, at low dark photon temperature, one can have consistency with BAO and CMB data, with a fraction of dark matter that is ADM ($f_{\rm adm}$) as large as $\sim 0.1$. Such a large $f_{\rm adm}$ leads to a suppression of density fluctuations today on scales below about 60 Mpc that may be of relevance to the $\sigma_8$ tension. Our work motivates calculation of nonlinear corrections to matter power spectrum predictions in the ADM model. We forecast parameter constraints to come from future ground-based CMB surveys, and find that if ADM is indeed the cause of the $\sigma_8$ tension, the influence of the ADM, primarily on CMB lensing, will likely be detectable at high significance.<br />Comment: 16 pages + references, 9 figures. Published in PRD – Name: TypeDocument Label: Document Type Group: TypDoc Data: Working Paper – Name: DOI Label: DOI Group: ID Data: 10.1103/PhysRevD.109.103516 – Name: URL Label: Access URL Group: URL Data: <link linkTarget="URL" linkTerm="http://arxiv.org/abs/2311.05678" linkWindow="_blank">http://arxiv.org/abs/2311.05678</link> – Name: AN Label: Accession Number Group: ID Data: edsarx.2311.05678 |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1103/PhysRevD.109.103516 Subjects: – SubjectFull: Astrophysics - Cosmology and Nongalactic Astrophysics Type: general – SubjectFull: High Energy Physics - Phenomenology Type: general Titles: – TitleFull: Cool dark sector, concordance, and a low $\sigma_8$ Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Hughes, Ellie – PersonEntity: Name: NameFull: Ge, Fei – PersonEntity: Name: NameFull: Cyr-Racine, Francis-Yan – PersonEntity: Name: NameFull: Knox, Lloyd – PersonEntity: Name: NameFull: Raghunathan, Srinivasan IsPartOfRelationships: – BibEntity: Dates: – D: 09 M: 11 Type: published Y: 2023 |
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