Constraining $f(Q, L_m)$ gravity with bulk viscosity
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arXiv
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| Autores principales: | , , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| author | Myrzakulov, Y. Donmez, O. Koussour, M. Muminov, S. Davletov, I. Y. Rayimbaev, J. |
| author_facet | Myrzakulov, Y. Donmez, O. Koussour, M. Muminov, S. Davletov, I. Y. Rayimbaev, J. |
| contents | We investigate the influence of bulk viscosity on late-time cosmic acceleration within an extended $f(Q, L_m)$ gravity framework, where the non-metricity $Q$ is non-minimally coupled with the matter Lagrangian $L_m$. Analyzing the function $f(Q, L_m) = αQ + βL_m$, we derive exact solutions under non-relativistic matter domination. Using observational datasets ($H(z)$, Pantheon supernovae, and their combination), we constrain the model parameters $H_0$, $α$, $β$, and $ζ$. The deceleration parameter transitions from positive to negative values around redshifts $z_t \approx 0.80$ to $0.99 $, indicating current accelerated expansion. Moreover, the effective equation of state parameter, $ω_{eff}$, resembles quintessence dark energy ($-1 < ω_{eff} < -\frac{1}{3}$), with corresponding values from respective datasets. Finally, we use the $Om(z)$ diagnostic, which confirms that our model demonstrates quintessence-like behavior. Our findings underscore the significant role of bulk viscosity in understanding accelerated expansion in the universe within alternative gravity theories. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_08837 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Constraining $f(Q, L_m)$ gravity with bulk viscosity Myrzakulov, Y. Donmez, O. Koussour, M. Muminov, S. Davletov, I. Y. Rayimbaev, J. Cosmology and Nongalactic Astrophysics We investigate the influence of bulk viscosity on late-time cosmic acceleration within an extended $f(Q, L_m)$ gravity framework, where the non-metricity $Q$ is non-minimally coupled with the matter Lagrangian $L_m$. Analyzing the function $f(Q, L_m) = αQ + βL_m$, we derive exact solutions under non-relativistic matter domination. Using observational datasets ($H(z)$, Pantheon supernovae, and their combination), we constrain the model parameters $H_0$, $α$, $β$, and $ζ$. The deceleration parameter transitions from positive to negative values around redshifts $z_t \approx 0.80$ to $0.99 $, indicating current accelerated expansion. Moreover, the effective equation of state parameter, $ω_{eff}$, resembles quintessence dark energy ($-1 < ω_{eff} < -\frac{1}{3}$), with corresponding values from respective datasets. Finally, we use the $Om(z)$ diagnostic, which confirms that our model demonstrates quintessence-like behavior. Our findings underscore the significant role of bulk viscosity in understanding accelerated expansion in the universe within alternative gravity theories. |
| title | Constraining $f(Q, L_m)$ gravity with bulk viscosity |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2407.08837 |