Cosmological Implications of Thermodynamic Split Conjecture

Abstract

Building on initial work on the Thermodynamic Split Conjecture (TSC), which posits that black hole and cosmological horizon thermodynamics are generically inequivalent, we examine the consequences of that split for the Gibbons Hawking temperature and its role across cosmology. We consider many key results in both early and late universe cosmology and show that many important results such as those governing eternal inflation, vacuum tunneling, quantum breaking and primordial black holes can change. The analysis further reveals that small, TSC motivated corrections to horizon thermodynamics can subtly modify Friedmann dynamics, potentially helping to address the $H_0$ and $S_8$ tensions. The work thus provides a unified route from quantum gravity motivated thermodynamics to observational cosmology and motivates dedicated tests of the thermal laws governing the Universe itself.

21 pages with no figures, comments are very welcome !

References in corpus (22)

• Unified cosmic history in modified gravity: from F(R) theory to Lorentz non-invariant models
• Dark energy cosmology: the equivalent description via different theoretical models and cosmography tests
• Primordial Black Holes as Dark Matter
• Thermodynamic Behavior of Friedmann Equation at Apparent Horizon of FRW Universe
• Eternal inflation and its implications
• Dark matter and the early Universe: a review
• Quantum Entropy Function from AdS(2)/CFT(1) Correspondence
• The 1965 Penrose singularity theorem
• Modified cosmology from extended entropy with varying exponent
• Logarithmic Corrections to Extremal Black Hole Entropy from Quantum Entropy Function
• Thermodynamics of apparent horizon and modified Friedman equations
• Microstates of a Neutral Black Hole in M Theory
• Nonperturbative black hole entropy and Kloosterman sums
• Arithmetic of Quantum Entropy Function
• Finite-time Cosmological Singularities and the Possible Fate of the Universe
• Soundness of Dark Energy properties
• Trans-Planckian censorship, inflation and excited initial states for perturbations
• Trans-Planckian censorship and other swampland bothers addressed in warm inflation
• Islands in Closed and Open Universes
• Thermodynamics of scale-dependent Friedmann equations
• Could Planck Star Remnants be Dark Matter?
• Imprints of screened dark energy on nonlocal quantum correlations