Alleviating both $H_0$ and ${\sigma }_8$ tensions in Tsallis cosmology

Abstract

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. Additionally, for the same parameter choice we obtain an increased friction term and an effective Newton's constant smaller than the usual one, and thus the ${\sigma }_8$ tension is also solved. These features act as a significant advantage of Tsallis modified cosmology.

16 pages, 4 figures

References in corpus (18)

• The trouble with $H_0$
• Thermodynamic Behavior of Friedmann Equation at Apparent Horizon of FRW Universe
• Unified First Law and Thermodynamics of Apparent Horizon in FRW Universe
• Friedmann Equations of FRW Universe in Scalar-tensor Gravity, f(R) Gravity and First Law of Thermodynamics
• Thermodynamic route to Field equations in Lanczos-Lovelock Gravity
• Thermodynamical Properties of Apparent Horizon in Warped DGP Braneworld
• Probing the interaction between dark matter and dark energy in the presence of massive neutrinos
• Modified cosmology from extended entropy with varying exponent
• Modified cosmology through spacetime thermodynamics and Barrow horizon entropy
• Early modified gravity in light of the $H_0$ tension and LSS data
• Analyzing the $H_0$ tension in $F(R)$ gravity models
• Thermodynamical First Laws of Black Holes in Quadratically-Extended Gravities
• Addressing the cosmological $H_0$ tension by the Heisenberg uncertainty
• The Hubble Tension, The $M$ Crisis of Late Time $H(z)$ Deformation Models and the Reconstruction of Quintessence Lagrangians
• Sources of $H_0$-tensions in dark energy scenarios
• Observational constraints on Tsallis modified gravity
• Can modified gravity models reconcile the tension between CMB anisotropy and lensing maps in Planck-like observations?
• Modified Cosmology Models from Thermodynamical Approach

Cited by in corpus (25)

• The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
• Negative cosmological constant in the dark energy sector: tests from JWST photometric and spectroscopic observations of high-redshift galaxies
• Quantifying the $S_8$ tension and evidence for interacting dark energy from redshift-space distortion measurements
• Transition dynamics in the ${\Lambda }_{\mathrm{s}}$CDM model: Implications for bound cosmic structures
• ${\Lambda }_{\mathrm{s}}$CDM cosmology: Alleviating major cosmological tensions by predicting standard neutrino properties
• Barrow and Tsallis entropies after the DESI DR2 BAO data
• Kaniadakis entropy in extreme gravitational and cosmological environments: a review on the state-of-the-art and future prospects
• Lagrangian formulation of the Tsallis entropy
• Constraints on Barrow and Tsallis Holographic Dark Energy from DESI DR2 BAO data
• Linear matter density perturbations in the ${\Lambda }_{\mathrm{s}}$CDM model: Examining growth dynamics and addressing the $S_8$ tension
• A visual tool for assessing tension-resolving models in the $H_0$-${\sigma }_8$ plane
• Cosmology from String T-duality and zero-point length
• Unveiling the Effects of Coupling Extended Proca-Nuevo Gravity on Cosmic Expansion with Recent Observations
• Topological and optical signatures of modified black-hole entropies
• Quantum Entropy-Driven Modifications to Holographic Dark Energy in $f(G,T)$ Gravity
• Addressing the DESI DR2 Phantom-Crossing Anomaly and Enhanced $H_0$ Tension with Reconstructed Scalar-Tensor Gravity
• Gravitational wave probes of Barrow cosmology with LISA standard sirens
• Dark Universe inspired by the Kaluza-Klein gravity and impact on Primordial Gravitational Waves
• Modified cosmology through generalized mass-to-horizon entropy: observational constraints from DESI DR2 BAO data
• Constraints on Tsallis cosmology using recent low and high redshift measurements
• Evolution of perturbations in the model of Tsallis holographic dark energy
• Modified cosmology through generalized mass-to-horizon entropy: implications for structure growth and primordial gravitational waves
• Observational constraints on Luciano-Saridakis entropic cosmology
• Thermodynamics of sign-switching dark energy models
• A winding number analysis of Schwarzschild black hole stability in light of Planck-scale modified kinematics