Thermodynamics of the FLRW apparent horizon

Abstract

To investigate the relationship between gravity and thermodynamics in the case of dynamic systems, we interpret the apparent horizon of the Friedmann-Lemaître-Robertson-Walker (FLRW) spacetime as a thermodynamic system. We derive the corresponding fundamental equation in the entropy representation and explore the consequences of demanding the fulfillment of the classical laws of thermodynamics. We investigate in detail the case of an FLRW spacetime with and without cosmological constant. We show that the interpretation of the apparent horizon as a thermodynamic system is possible only under certain conditions because the analogy is not always valid for all the values of the parameters entering the dynamics of the horizon and certainly not for its entire evolution.

arXiv commentTypos corrected, comments and reference added

References in corpus (18)

• Thermodynamics of Spacetime: The Einstein Equation of State
• Enthalpy and the Mechanics of AdS Black Holes
• Black hole chemistry: thermodynamics with Lambda
• First Law of Thermodynamics and Friedmann Equations of Friedmann-Robertson-Walker Universe
• The Thermodynamics of Black Holes
• General Laws of Black-Hole Dynamics
• Unified first law of black-hole dynamics and relativistic thermodynamics
• Gravitational Energy in Spherical Symmetry
• Cosmic Holography
• Dark energy and the generalized second law
• An analysis of systematic effects in finite size scaling studies using the gradient flow
• General Relativity from a Thermodynamic Perspective
• The generalized second law of thermodynamics with Barrow entropy
• Does the entropy of the Universe tend to a maximum?
• Cosmological apparent and trapping horizons
• The Apparent (Gravitational) Horizon in Cosmology
• The Apparent Universe
• Thermodynamics of FRW Universe: Heat Engine

Cited by in corpus (11)

• Holographic realization from inflation to reheating in generalized entropic cosmology
• Evolution of thermodynamic quantities on cosmological horizon in $\Lambda (t)$ model
• Exploring Modifications to FLRW Cosmology with General Entropy and Thermodynamics: A new Approach
• Thermodynamics of the Primordial Universe
• Holographic thermodynamic relation for dissipative and non-dissipative universes in a flat FLRW cosmology
• Entropy Bounds and Holographic Dark Energy: Conflicts and Consensus
• Cosmological Tensions with Non-Extensive Entropic Cosmology: A Modified Stress-Energy Approach
• Revealing some cosmological aspects of Kaniadakis entropy
• Cosmological scenario based on the first and second laws of thermodynamics: Thermodynamic constraints on a generalized cosmological model
• Thermodynamics of sign-switching dark energy models
• First-order phase transitions and cosmic evolution: thermodynamic approach to generalized holographic dark energy