Scalar perturbations on the normal and self-accelerating branch of a DGP brane and $σ_8$
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arXiv
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| Hauptverfasser: | , |
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| Format: | Preprint |
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2024
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| _version_ | 1866908760641896448 |
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| author | Hernández-Márquez, Maribel Escamilla-Rivera, Celia |
| author_facet | Hernández-Márquez, Maribel Escamilla-Rivera, Celia |
| contents | In this work we constrain the value of $σ_8$ for the normal and self-accelerating branch of a DGP brane embedded in a five-dimensional Minkowski space-time. For that purpose we first constrain the model parameters $H_0$, $Ω_{m0}$, $Ω_{r0}$ and $M$ by means of the Pantheon+ catalog and a mock catalog of gravitational waves. Then, we solve numerically the equation for dark matter scalar perturbations using the dynamical scaling solution for the master equation and assuming that $p=4$ for the matter dominated era. Finally, we found that the evolution of matter density perturbations in both branches is different from the $Λ$CDM model and that the value of $σ_8=0.774\pm0.027$ for the normal branch and $σ_8=0.913\pm0.032$ for the self-accelerating branch. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_08852 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Scalar perturbations on the normal and self-accelerating branch of a DGP brane and $σ_8$ Hernández-Márquez, Maribel Escamilla-Rivera, Celia General Relativity and Quantum Cosmology Cosmology and Nongalactic Astrophysics In this work we constrain the value of $σ_8$ for the normal and self-accelerating branch of a DGP brane embedded in a five-dimensional Minkowski space-time. For that purpose we first constrain the model parameters $H_0$, $Ω_{m0}$, $Ω_{r0}$ and $M$ by means of the Pantheon+ catalog and a mock catalog of gravitational waves. Then, we solve numerically the equation for dark matter scalar perturbations using the dynamical scaling solution for the master equation and assuming that $p=4$ for the matter dominated era. Finally, we found that the evolution of matter density perturbations in both branches is different from the $Λ$CDM model and that the value of $σ_8=0.774\pm0.027$ for the normal branch and $σ_8=0.913\pm0.032$ for the self-accelerating branch. |
| title | Scalar perturbations on the normal and self-accelerating branch of a DGP brane and $σ_8$ |
| topic | General Relativity and Quantum Cosmology Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2412.08852 |