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- W4281254735 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 $Spropto A$, we have instead $Spropto A^{1+delta/2}$, where $0leqslant delta leqslant 1$ 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." @default.
- W4281254735 created "2022-05-23" @default.
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- W4281254735 date "2022-05-18" @default.
- W4281254735 modified "2023-10-16" @default.
- W4281254735 title "Sign Switching Dark Energy from a Running Barrow Entropy" @default.
- W4281254735 hasPublicationYear "2022" @default.
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