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| Main Authors: | , , , |
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| Format: | Preprint |
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2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2405.17554 |
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| _version_ | 1866916283364147200 |
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| author | Bagherian, Hengameh Joseph, Melissa Schmaltz, Martin Sivarajan, Eashwar N. |
| author_facet | Bagherian, Hengameh Joseph, Melissa Schmaltz, Martin Sivarajan, Eashwar N. |
| contents | Models of interacting dark radiation have been shown to alleviate the Hubble tension. Extensions incorporating a coupling between dark matter and dark radiation (DM-DR) have been proposed as combined solutions to both the Hubble and $S_8$ tensions. A key feature of these extended models is a break in the matter power spectrum (MPS), suppressing power for modes that enter the horizon before the DM-DR interactions turn off. In scenarios with a massless mediator, modes that enter before matter-radiation equality get suppressed, whereas for massive mediators, the break is determined by the mediator mass, a free parameter. In this work, we test these models against probes of LSS: weak lensing, CMB lensing, full-shape galaxy clustering, and eBOSS measurements of the 1D Ly$α\,$ forest flux power spectrum. The latter are the most constraining since they probe small scales where many models predict the largest deviations. In fact, already within $Λ{\rm CDM}\,$, the eBOSS Ly$α\,$ data are in significant tension with Planck CMB data, with the Ly$α\,$ data preferring a steeper slope of the MPS at $k \sim h \mathrm{Mpc}^{-1}$. We find that the simplest dark radiation models, which improve the Hubble tension, worsen the fit to the Ly$α\,$ data. However, models with DM-DR interactions can simultaneously address both tensions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_17554 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Stepping into the Forest: Confronting Interacting Radiation Models for the Hubble Tension with Lyman-$α$ Data Bagherian, Hengameh Joseph, Melissa Schmaltz, Martin Sivarajan, Eashwar N. Cosmology and Nongalactic Astrophysics Models of interacting dark radiation have been shown to alleviate the Hubble tension. Extensions incorporating a coupling between dark matter and dark radiation (DM-DR) have been proposed as combined solutions to both the Hubble and $S_8$ tensions. A key feature of these extended models is a break in the matter power spectrum (MPS), suppressing power for modes that enter the horizon before the DM-DR interactions turn off. In scenarios with a massless mediator, modes that enter before matter-radiation equality get suppressed, whereas for massive mediators, the break is determined by the mediator mass, a free parameter. In this work, we test these models against probes of LSS: weak lensing, CMB lensing, full-shape galaxy clustering, and eBOSS measurements of the 1D Ly$α\,$ forest flux power spectrum. The latter are the most constraining since they probe small scales where many models predict the largest deviations. In fact, already within $Λ{\rm CDM}\,$, the eBOSS Ly$α\,$ data are in significant tension with Planck CMB data, with the Ly$α\,$ data preferring a steeper slope of the MPS at $k \sim h \mathrm{Mpc}^{-1}$. We find that the simplest dark radiation models, which improve the Hubble tension, worsen the fit to the Ly$α\,$ data. However, models with DM-DR interactions can simultaneously address both tensions. |
| title | Stepping into the Forest: Confronting Interacting Radiation Models for the Hubble Tension with Lyman-$α$ Data |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2405.17554 |