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Sign Switching Dark Energy from a Running Barrow Entropy

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arxiv 2205.09311 v2 pith:FS3LRWU7 submitted 2022-05-19 gr-qc astro-ph.COhep-th

Sofia Di Gennaro , Yen Chin Ong This is my paper · ORCID
classification gr-qcastro-ph.COhep-th
keywords energybarrowentropydarkdeltaareagravitationalleqslant
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abstract

Barrow proposed that the area law of the entropy associated with a horizon might receive a "fractal correction" due to quantum gravitational effects -- in place of $S\propto A$, we have instead $S\propto A^{1+\delta/2}$, where $0\leqslant \delta \leqslant 1$ measures the deviation from the standard area law ($\delta=0$). Based on black hole thermodynamics, we argue that the Barrow entropy should run (i.e., energy scale dependent), which is reasonable given that quantum gravitational corrections are expected to be important only in high energy regime. When applied to the Friedmann equation, we demonstrate the possibility that such a running Barrow entropy index could give rise to a dynamical effective dark energy, which is asymptotically positive and vanishing, but negative at the Big Bang. Such a sign switching dark energy could help to alleviate the Hubble tension. Other cosmological implications are discussed.

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Cited by 5 Pith papers

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    gr-qc 2026-07 conditional novelty 6.0 of 10

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  3. Background-level reconstruction of scalar-field potentials from dark-energy histories and comparison with analytic potential families

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    A background reconstruction maps prescribed ρ_de(z) histories to V(φ) and ranks analytic potentials by Bayesian evidence, with exponential preferred for CPL and shifted-tanh for sign-switching targets.

  4. 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.

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