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| Autores principales: | , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| Materias: | |
| Acceso en línea: | https://arxiv.org/abs/2508.06590 |
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| _version_ | 1866913990496485376 |
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| author | Sanyal, Aritra Dhankar, Praveen Kumar Munyeshyaka, Albert Islam, Safiqul Rahaman, Farook |
| author_facet | Sanyal, Aritra Dhankar, Praveen Kumar Munyeshyaka, Albert Islam, Safiqul Rahaman, Farook |
| contents | We study the emergence of cosmic hysteresis in cyclic bouncing universes within the framework of analytically reconstructed $f(R)$ gravity. Using exact bouncing scale factor solutions of exponential and power-law forms, we reconstruct the corresponding $f(R)$ models and investigate the thermodynamic behavior of a minimally coupled scalar field in these geometries. The pressure evolution during expansion and contraction phases is shown to be asymmetric, leading to a non-vanishing thermodynamic work integral over each cycle, defined by $\oint p_ϕ\, dV$. We identify closed hysteresis loops in the equation-of-state space and quantify the net energy transfer per cycle. Our results reveal that such reconstructed $f(R)$ models generically support irreversible evolution, demonstrating a natural emergence of the thermodynamic arrow of time. These findings provide new insight into the dissipative features of modified gravity and the long-term dynamics of cyclic cosmological scenarios. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_06590 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Cosmic Hysteresis in Reconstructed $f(R)$ Bounce Models: A Thermodynamic Study Sanyal, Aritra Dhankar, Praveen Kumar Munyeshyaka, Albert Islam, Safiqul Rahaman, Farook General Relativity and Quantum Cosmology We study the emergence of cosmic hysteresis in cyclic bouncing universes within the framework of analytically reconstructed $f(R)$ gravity. Using exact bouncing scale factor solutions of exponential and power-law forms, we reconstruct the corresponding $f(R)$ models and investigate the thermodynamic behavior of a minimally coupled scalar field in these geometries. The pressure evolution during expansion and contraction phases is shown to be asymmetric, leading to a non-vanishing thermodynamic work integral over each cycle, defined by $\oint p_ϕ\, dV$. We identify closed hysteresis loops in the equation-of-state space and quantify the net energy transfer per cycle. Our results reveal that such reconstructed $f(R)$ models generically support irreversible evolution, demonstrating a natural emergence of the thermodynamic arrow of time. These findings provide new insight into the dissipative features of modified gravity and the long-term dynamics of cyclic cosmological scenarios. |
| title | Cosmic Hysteresis in Reconstructed $f(R)$ Bounce Models: A Thermodynamic Study |
| topic | General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2508.06590 |