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Thermodynamics of an accelerated expanding universe

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arxiv gr-qc/0511051 v1 pith:3NQKZ7YL submitted 2005-11-10 gr-qc

Bin Wang , Yungui Gong , Elcio Abdalla This is my paper · ORCID
classification gr-qc
keywords thermodynamicsuniversehorizonlawsboundarycosmologicaleventaccelerated
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We investigate the laws of thermodynamics in an accelerating universe driven by dark energy with a time-dependent equation of state. In the case we consider that the physically relevant part of the Universe is that envelopped by the dynamical apparent horizon, we have shown that both the first law and second law of thermodynamics are satisfied. On the other hand, if the boundary of the Universe is considered to be the cosmological event horizon the thermodynamical description based on the definitions of boundary entropy and temperature breaks down. No parameter redefinition can rescue the thermodynamics laws from such a fate, rendering the cosmological event horizon unphysical from the point of view of the laws of thermodynamics.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Phantom-Divide Crossing in Barrow-Tsallis Holographic Dark Energy with a Scale-Dependent Barrow Exponent

    gr-qc 2026-07 conditional novelty 5.0 of 10

    For generalized-entropy holographic dark energy with a future-event-horizon cutoff, the phantom-divide crossing on the kinematic branch is unique, quintessence-to-phantom, and fixes the local entropy-scaling dimension...

  2. Modified Cosmology from Mass-to-Horizon Relation: Background Evolution

    gr-qc 2026-06 unverdicted novelty 5.0 of 10

    Viable generalized horizon entropies from the mass-to-horizon relation are restricted to a narrow neighborhood around the Bekenstein-Hawking law, yielding only Lambda-CDM-like background evolution.

  3. Constraints on R\'{e}nyi Entropy through Primordial Big-Bang Nucleosynthesis and Baryogenesis

    physics.gen-ph 2025-07 reject novelty 5.0 of 10

    Rényi entropy cosmology constrained by BBN: helium and deuterium allow overlapping λ ranges near 10^-85, lithium requires disjoint values, so the constant-λ model cannot solve the lithium problem.

  4. Ghost Dark Energy in the Modified Kaniadakis Cosmology

    gr-qc 2026-07 conditional novelty 3.5 of 10

    Interacting ghost dark energy in Kaniadakis-corrected cosmology mildly shifts acceleration onset and approaches ΛCDM, remaining generally unstable though less so for larger λ.

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