Modified cosmology in $f(Q, L_m)$ gravity
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866910924231671808 |
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| author | Myrzakulov, Y. Alfedeel, Alnadhief H. A. Koussour, M. Muminov, S. Hassan, E. I. Rayimbaev, J. |
| author_facet | Myrzakulov, Y. Alfedeel, Alnadhief H. A. Koussour, M. Muminov, S. Hassan, E. I. Rayimbaev, J. |
| contents | In this letter, we investigate cosmology within the framework of modified $f(Q, L_m)$ gravity using the non-linear model $f(Q, L_m) = -Q + αL_m^n + β$, where $α$, $β$, and $n$ are free parameters. The modified Friedmann equations are derived for a matter-dominated universe, and an analytical solution is obtained. Using Hubble, Pantheon+, and joint datasets, we constrain the model parameters and examine their implications. The results indicate that the model accommodates varying $H_0$ values, contributing to the Hubble tension, while $n \neq 1$ suggests deviations from general relativity (GR). The deceleration parameter confirms a transition to acceleration at $z_t \approx 0.6 - 0.8$, with present values supporting cosmic acceleration. This model offers a viable alternative to GR-based cosmology. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_00208 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Modified cosmology in $f(Q, L_m)$ gravity Myrzakulov, Y. Alfedeel, Alnadhief H. A. Koussour, M. Muminov, S. Hassan, E. I. Rayimbaev, J. Cosmology and Nongalactic Astrophysics In this letter, we investigate cosmology within the framework of modified $f(Q, L_m)$ gravity using the non-linear model $f(Q, L_m) = -Q + αL_m^n + β$, where $α$, $β$, and $n$ are free parameters. The modified Friedmann equations are derived for a matter-dominated universe, and an analytical solution is obtained. Using Hubble, Pantheon+, and joint datasets, we constrain the model parameters and examine their implications. The results indicate that the model accommodates varying $H_0$ values, contributing to the Hubble tension, while $n \neq 1$ suggests deviations from general relativity (GR). The deceleration parameter confirms a transition to acceleration at $z_t \approx 0.6 - 0.8$, with present values supporting cosmic acceleration. This model offers a viable alternative to GR-based cosmology. |
| title | Modified cosmology in $f(Q, L_m)$ gravity |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2505.00208 |