Running gravitational constant induced dark energy as a solution to $σ_8$ tension
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arXiv
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| Auteurs principaux: | , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866929597651615744 |
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| author | Zhumabek, Tilek Mukhamediya, Azamat Chakrabarty, Hrishikesh Malafarina, Daniele |
| author_facet | Zhumabek, Tilek Mukhamediya, Azamat Chakrabarty, Hrishikesh Malafarina, Daniele |
| contents | We consider a modified gravity model with a running gravitational constant coupled to a varying dark energy fluid and test its imprint on the growth of structure in the universe. Using Redshift Space Distortion (RSD) measurement results, we show a tension at the $3 σ$ level between the best fit $Λ$CDM and the corresponding parameters obtained from the Planck data. Unlike many modified gravity-based solutions that overlook scale dependence and model-specific background evolution, we study this problem in the broadest possible context by incorporating both factors into our investigation. We performed a full perturbation analysis to demonstrate a scale dependence in the growth equation. Fixing the scale to $k = 0.1 h$ Mpc$^{-1}$ and introducing a phenomenological functional form for the varying Newton coupling $G$ with only one free parameter, we conduct a likelihood analysis of the RSD selected data. The analysis reveals that the model can bring the tension level within $1 σ$ while maintaining the deviation of $G$ from Newton's gravitational constant at the fifth order. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_05965 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Running gravitational constant induced dark energy as a solution to $σ_8$ tension Zhumabek, Tilek Mukhamediya, Azamat Chakrabarty, Hrishikesh Malafarina, Daniele Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology We consider a modified gravity model with a running gravitational constant coupled to a varying dark energy fluid and test its imprint on the growth of structure in the universe. Using Redshift Space Distortion (RSD) measurement results, we show a tension at the $3 σ$ level between the best fit $Λ$CDM and the corresponding parameters obtained from the Planck data. Unlike many modified gravity-based solutions that overlook scale dependence and model-specific background evolution, we study this problem in the broadest possible context by incorporating both factors into our investigation. We performed a full perturbation analysis to demonstrate a scale dependence in the growth equation. Fixing the scale to $k = 0.1 h$ Mpc$^{-1}$ and introducing a phenomenological functional form for the varying Newton coupling $G$ with only one free parameter, we conduct a likelihood analysis of the RSD selected data. The analysis reveals that the model can bring the tension level within $1 σ$ while maintaining the deviation of $G$ from Newton's gravitational constant at the fifth order. |
| title | Running gravitational constant induced dark energy as a solution to $σ_8$ tension |
| topic | Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2411.05965 |