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| Autori principali: | , , , |
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| Natura: | Preprint |
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2025
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| Accesso online: | https://arxiv.org/abs/2506.21083 |
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| _version_ | 1866911037888921600 |
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| author | Ingole, Yash B. Somwanshi, K. V. Bhoyar, S. R. Bayaskar, S. N. |
| author_facet | Ingole, Yash B. Somwanshi, K. V. Bhoyar, S. R. Bayaskar, S. N. |
| contents | In this study, we investigate the late-time accelerated expansion of the universe within the framework of non-minimally coupled $f(Q,L_m)$ gravity, where $Q$ is the non-metricity scalar and $L_m$ is the matter Lagrangian. We derive modified Friedmann equations in a flat FLRW background and employ the \textit{Gong-Zhang} parameterization for the DE equation of state (EoS), allowing an analytical form of the Hubble parameter $H(z)$. The model parameters are constrained using recent Cosmic Chronometers (CC) and Pantheon+SH0ES Type Ia supernova datasets through MCMC-based chi-squared minimization. We analyze various cosmological quantities including the deceleration parameter, EoS, jerk, snap, lerk, and diagnostic tools such as $Om(z)$ and the statefinder pair $(r,s)$. Our findings indicate a viable transition from deceleration to acceleration and reveal a quintessence-to-phantom-like evolution of dark energy. Furthermore, energy conditions are examined, showing a violation of the strong energy condition, consistent with current cosmic acceleration. The results establish that the $f(Q,L_m) $ framework with non-minimal coupling and parameterized EoS provides a compelling alternative to $Λ$CDM in describing cosmic acceleration. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_21083 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Exploring Dark Energy via Non-Minimal Coupling in $f(Q,L_m)$ Gravity with Gong-Zhang Parameterization Ingole, Yash B. Somwanshi, K. V. Bhoyar, S. R. Bayaskar, S. N. General Relativity and Quantum Cosmology In this study, we investigate the late-time accelerated expansion of the universe within the framework of non-minimally coupled $f(Q,L_m)$ gravity, where $Q$ is the non-metricity scalar and $L_m$ is the matter Lagrangian. We derive modified Friedmann equations in a flat FLRW background and employ the \textit{Gong-Zhang} parameterization for the DE equation of state (EoS), allowing an analytical form of the Hubble parameter $H(z)$. The model parameters are constrained using recent Cosmic Chronometers (CC) and Pantheon+SH0ES Type Ia supernova datasets through MCMC-based chi-squared minimization. We analyze various cosmological quantities including the deceleration parameter, EoS, jerk, snap, lerk, and diagnostic tools such as $Om(z)$ and the statefinder pair $(r,s)$. Our findings indicate a viable transition from deceleration to acceleration and reveal a quintessence-to-phantom-like evolution of dark energy. Furthermore, energy conditions are examined, showing a violation of the strong energy condition, consistent with current cosmic acceleration. The results establish that the $f(Q,L_m) $ framework with non-minimal coupling and parameterized EoS provides a compelling alternative to $Λ$CDM in describing cosmic acceleration. |
| title | Exploring Dark Energy via Non-Minimal Coupling in $f(Q,L_m)$ Gravity with Gong-Zhang Parameterization |
| topic | General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2506.21083 |