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| Formato: | Preprint |
| Publicado: |
2023
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| Acceso en línea: | https://arxiv.org/abs/2312.13235 |
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| _version_ | 1866909166347485184 |
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| author | Sobotka, Alexander C. Erickcek, Adrienne L. Smith, Tristan L. |
| author_facet | Sobotka, Alexander C. Erickcek, Adrienne L. Smith, Tristan L. |
| contents | We derive constraints on the injection of free-streaming dark radiation after big bang nucleosynthesis (BBN) by considering the decay of a massive hidden sector particle into dark radiation. Such a scenario has the potential to alleviate the Hubble tension by introducing a new energy component to the evolution of the early universe. We employ observations of the cosmic microwave background (CMB) from $\textit{Planck}$ 2018 and the South Pole Telescope (SPT-3G), measurements of the primordial deuterium abundance, Pantheon+ Type Ia supernovae data, and baryon acoustic oscillation (BAO) measurements from BOSS DR12 to constrain these decay scenarios. Pre-recombination decays are primarily restricted by observations of the CMB via their impact on the effective number of relativistic species. On the other hand, long-lived decay scenarios in which the massive particle lifetime extends past recombination tend to decrease the late-time matter density inferred from the CMB and are thus subject to constraints from Pantheon+ and BAO. We find that, when marginalizing over lifetimes of $τ_Y = [10^{-12.08}, 10^{-1.49}]$ Gyr, the decaying particle is limited at $2σ$ to only contribute a maximum of $3\%$ of the energy density of the universe. With limits on these decays being so stringent, neither short-lived nor long-lived scenarios are successful at substantially mitigating the Hubble tension. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_13235 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Comprehensive Constraints on Dark Radiation Injection After BBN Sobotka, Alexander C. Erickcek, Adrienne L. Smith, Tristan L. Cosmology and Nongalactic Astrophysics We derive constraints on the injection of free-streaming dark radiation after big bang nucleosynthesis (BBN) by considering the decay of a massive hidden sector particle into dark radiation. Such a scenario has the potential to alleviate the Hubble tension by introducing a new energy component to the evolution of the early universe. We employ observations of the cosmic microwave background (CMB) from $\textit{Planck}$ 2018 and the South Pole Telescope (SPT-3G), measurements of the primordial deuterium abundance, Pantheon+ Type Ia supernovae data, and baryon acoustic oscillation (BAO) measurements from BOSS DR12 to constrain these decay scenarios. Pre-recombination decays are primarily restricted by observations of the CMB via their impact on the effective number of relativistic species. On the other hand, long-lived decay scenarios in which the massive particle lifetime extends past recombination tend to decrease the late-time matter density inferred from the CMB and are thus subject to constraints from Pantheon+ and BAO. We find that, when marginalizing over lifetimes of $τ_Y = [10^{-12.08}, 10^{-1.49}]$ Gyr, the decaying particle is limited at $2σ$ to only contribute a maximum of $3\%$ of the energy density of the universe. With limits on these decays being so stringent, neither short-lived nor long-lived scenarios are successful at substantially mitigating the Hubble tension. |
| title | Comprehensive Constraints on Dark Radiation Injection After BBN |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2312.13235 |