2025/08/08 by Sanyal, Aritra, Dhankar, Praveen Kumar, Munyeshyaka, Albert +2 · 2 citations
#FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc)
paper · doi:10.48550/arxiv.2508.06590
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 pϕ 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.