Bouncing behavior in $f(R,L_m)$ gravity: Phantom crossing and energy conditions
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866917624594563072 |
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| author | Koussour, M. Myrzakulov, N. Rayimbaev, Javlon Alfedeel, Alnadhief H. A. Elkhair, H. M. |
| author_facet | Koussour, M. Myrzakulov, N. Rayimbaev, Javlon Alfedeel, Alnadhief H. A. Elkhair, H. M. |
| contents | In this work, we investigate the bouncing behavior of the universe within the framework of $f(R,L_m)$ gravity, using a simple form of $f(R,L_m)=\frac{R}{2}+L_m^γ$ (where $γ$ is a free model parameter) as previously studied. The model predicts a vanishing Hubble parameter in the early and late times, with the deceleration parameter approaching a specific limit at the bouncing point. The EoS parameter is observed to cross the phantom divide line ($ω=-1$) near the bouncing point, indicating a significant transition from a contracting to an expanding phase. The model satisfies the necessary energy conditions for a successful bouncing scenario, with violations indicating exotic matter near the bouncing point. Stability conditions are satisfied for certain values of $γ$ near the bouncing point, but potential instabilities in late-time evolution require further investigation. Finally, we conclude that the $f(R,L_m)$ gravity model is promising for understanding the universe's dynamics, especially during events like the bouncing phase. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_15772 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Bouncing behavior in $f(R,L_m)$ gravity: Phantom crossing and energy conditions Koussour, M. Myrzakulov, N. Rayimbaev, Javlon Alfedeel, Alnadhief H. A. Elkhair, H. M. General Relativity and Quantum Cosmology Cosmology and Nongalactic Astrophysics In this work, we investigate the bouncing behavior of the universe within the framework of $f(R,L_m)$ gravity, using a simple form of $f(R,L_m)=\frac{R}{2}+L_m^γ$ (where $γ$ is a free model parameter) as previously studied. The model predicts a vanishing Hubble parameter in the early and late times, with the deceleration parameter approaching a specific limit at the bouncing point. The EoS parameter is observed to cross the phantom divide line ($ω=-1$) near the bouncing point, indicating a significant transition from a contracting to an expanding phase. The model satisfies the necessary energy conditions for a successful bouncing scenario, with violations indicating exotic matter near the bouncing point. Stability conditions are satisfied for certain values of $γ$ near the bouncing point, but potential instabilities in late-time evolution require further investigation. Finally, we conclude that the $f(R,L_m)$ gravity model is promising for understanding the universe's dynamics, especially during events like the bouncing phase. |
| title | Bouncing behavior in $f(R,L_m)$ gravity: Phantom crossing and energy conditions |
| topic | General Relativity and Quantum Cosmology Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2403.15772 |