Investigating the Hubble Tension and $σ_8$ Discrepancy in f(Q) Cosmology
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arXiv
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| author | Sakr, Ziad Schey, Leonid |
| author_facet | Sakr, Ziad Schey, Leonid |
| contents | In this study, we incorporated a three-parameter family, of the metric incompatible modification of standard general relativity $f(Q)$ models into the Boltzmann code MGCLASS at both the background and perturbation levels, in order to conduct a Bayesian study employing probes that include the cosmic microwave background (CMB), baryon acoustic oscillations (BAO), weak lensing (WL), alone or its correlation with galaxy clustering (3$\times$2pt) and growth measurements $f σ_8$, for each submodel. Our analysis focused on the impact of the Hubble tension in $H_0$ and the discrepancy in $σ_8$ resulting from the inclusion of our model parameters, namely $M$, $α$ and $β$. We find that none of the sub models, considered alone or combined, were able of alleviating the Hubble tension with only reducing it to 3 $σ$ in the least constraining, highest degree of freedom case while we found that the $σ_8$ discrepancy, already strongly mitigated on WL linear scales, especially when we let all our model's parameters as free, appears again when considering the more constraining 3$\times$2pt probe. Among the parameters considered, we found that $β$, acting in scaling both the gravitational and the Hubble parameter, had the most impact in reducing the discrepancy, with data preferring far from $Λ$CDM alike values, before the combination with $f σ_8$ constrain it back to its general relativity values. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_03627 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Investigating the Hubble Tension and $σ_8$ Discrepancy in f(Q) Cosmology Sakr, Ziad Schey, Leonid Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology In this study, we incorporated a three-parameter family, of the metric incompatible modification of standard general relativity $f(Q)$ models into the Boltzmann code MGCLASS at both the background and perturbation levels, in order to conduct a Bayesian study employing probes that include the cosmic microwave background (CMB), baryon acoustic oscillations (BAO), weak lensing (WL), alone or its correlation with galaxy clustering (3$\times$2pt) and growth measurements $f σ_8$, for each submodel. Our analysis focused on the impact of the Hubble tension in $H_0$ and the discrepancy in $σ_8$ resulting from the inclusion of our model parameters, namely $M$, $α$ and $β$. We find that none of the sub models, considered alone or combined, were able of alleviating the Hubble tension with only reducing it to 3 $σ$ in the least constraining, highest degree of freedom case while we found that the $σ_8$ discrepancy, already strongly mitigated on WL linear scales, especially when we let all our model's parameters as free, appears again when considering the more constraining 3$\times$2pt probe. Among the parameters considered, we found that $β$, acting in scaling both the gravitational and the Hubble parameter, had the most impact in reducing the discrepancy, with data preferring far from $Λ$CDM alike values, before the combination with $f σ_8$ constrain it back to its general relativity values. |
| title | Investigating the Hubble Tension and $σ_8$ Discrepancy in f(Q) Cosmology |
| topic | Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2405.03627 |