
TL;DR
This paper explores cosmological hysteresis in various modified gravity models, showing how it can lead to cyclic universes with increasing amplitude, offering an alternative to inflation and introducing an arrow of time in a dissipationless setting.
Contribution
It demonstrates the widespread occurrence of hysteresis in different cosmological potentials within modified gravity frameworks, providing semi-analytical conditions for an ever-expanding universe.
Findings
Hysteresis causes increasing cycle amplitudes in cyclic cosmologies.
The phenomenon depends on the sign of the hysteresis loop integral.
Hysteresis introduces an arrow of time without dissipation.
Abstract
Hysteresis is a phenomenon occurring naturally in several magnetic and electric materials in condensed matter physics. When applied to cosmology, aka cosmological hysteresis, has interesting and vivid implications in the scenario of a cyclic bouncy universe. Most importantly, this physical prescription can be treated as an alternative proposal to inflationary paradigm. Cosmological hysteresis is caused by the asymmetry in the equation of state parameter during expansion and contraction phase of the universe, due to the presence of a single scalar field. This process is purely thermodynamical in nature, results in a non-vanishing hysteresis loop integral in cosmology. When applied to variants of modified gravity models -1) Dvali-Gabadadze-Porrati (DGP) brane world gravity, 2) Cosmological constant dominated Einstein gravity, 3) Loop Quantum Gravity (LQG), 4)…
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