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2023

Alleviating both $H_0$ and $\sigma_8$ tensions in Tsallis cosmology

Basilakos, Spyros, Lymperis, Andreas, Petronikolou, Maria et al.

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We present how Tsallis cosmology can alleviate both $H_0$ and $\sigma_8$ tensions simultaneously.

Such a modified cosmological scenario is obtained by the application of the gravity-thermodynamics conjecture, but using the non-additive Tsallis entropy, instead of the standard Bekenstein-Hawking one.
Hence, one obtains modified Friedmann equations, with extra terms that depend on the new Tsallis exponent $\delta$ that quantifies the departure from standard entropy.
We show that for particular $\delta$ choices we can obtain a phantom effective dark energy, which is known to be one of the sufficient mechanisms that can alleviate $H_0$ tension.

Alleviating both $H_0$ and $\sigma_8$ tensions in Tsallis cosmology · Around

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