Barrow and Tsallis entropies after the DESI DR2 BAO data

Abstract

Modified cosmology based on Barrow entropy arises from the gravity-thermodynamics conjecture, in which the standard Bekenstein-Hawking entropy is replaced by the Barrow entropy of quantum-gravitational origin, characterized by the Barrow parameter $\Delta$. Interestingly, this framework exhibits similarities with cosmology based on Tsallis $\delta$-entropy, which, although rooted in a non-extensive generalization of Boltzmann-Gibbs statistics, features the same power-law deformation of the holographic scaling present in the Barrow case. We use observational data from Supernova Type Ia (SNIa), Cosmic Chronometers (CC), and Baryonic acoustic oscillations (BAO), including the recently released DESI DR2 data, in order to extract constraints on such scenarios. As we show, the best-fit value for the Barrow exponent $\Delta$ is found to be negative, while the zero value, which corresponds to $\Lambda$CDM paradigm, is allowed only in the range of $2\sigma$ for three out of four datasets. Additionally, for the case of the SN${}_0$+OHD+BAO dataset, for the current Hubble function we obtain a value of $H_0=72.2_{-0.9}^{+0.9}$, which may potentially alleviate the $H_0$ tension. Moreover, we compare our results with the Gaussian Process reconstruction of the dark-energy equation of state for the DESI + Cosmic Microwave Background (CMB) + Union3 datasets. Finally, by applying information criteria such as the Akaike Information Criterion and the Bayes evidence, we compare the fitting efficiency of the scenario at hand with $\Lambda$CDM cosmology, showing that the latter is slightly favoured.

11 pages, 3 figures, and 2 tables. Minor revisions to v1 to match the published version

References in corpus (32)

• A Comprehensive Measurement of the Local Value of the Hubble Constant with 1 km/s/Mpc Uncertainty from the Hubble Space Telescope and the SH0ES Team
• N=6 superconformal Chern-Simons-matter theories, M2-branes and their gravity duals
• The Pantheon+ Analysis: Cosmological Constraints
• DESI DR2 Results II: Measurements of Baryon Acoustic Oscillations and Cosmological Constraints
• Thermodynamic Behavior of Friedmann Equation at Apparent Horizon of FRW Universe
• PolyChord: nested sampling for cosmology
• The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
• Eppur è piatto? The cosmic chronometer take on spatial curvature and cosmic concordance
• The Completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: Large-scale Structure Catalogs for Cosmological Analysis
• Barrow entropic dark energy: A member of generalized holographic dark energy family
• Modified cosmology through spacetime thermodynamics and Barrow horizon entropy
• Can late-time extensions solve the $H_0$ and ${\sigma }_8$ tensions?
• New constraints on interacting dark energy from DESI DR2 BAO observations
• Prospecting Black Hole Thermodynamics with Fractional Quantum Mechanics
• Assessing cosmological evidence for non-minimal coupling
• Geometrical observational bounds on a fractal horizon holographic dark energy
• Constraints on Barrow entropy from M87* and S2 star observations
• Barrow Entropy Cosmology: an observational approach with a hint of stability analysis
• Cosmic evolution and thermal stability of Barrow holographic dark energy in nonflat Friedmann-Robertson-Walker Universe
• de Sitter Fractional Quantum Cosmology
• Modified gravity realizations of quintom dark energy after DESI DR2
• Alleviating both $H_0$ and ${\sigma }_8$ tensions in Tsallis cosmology
• Testing Non-Coincident $f(Q)$-gravity with DESI DR2 BAO and GRBs
• Constraining Barrow entropy-based Cosmology with power-law inflation
• Tsallis cosmology and its applications in dark matter physics with focus on IceCube high-energy neutrino data
• Saez-Ballester gravity in Kantowski-Sachs Universe: a new reconstruction paradigm for Barrow Holographic Dark Energy
• Imprints of Barrow-Tsallis Cosmology in Primordial Gravitational Waves
• Interacting Dark Sectors in light of DESI DR2
• Dynamical Dark Energy Implies a Coupled Dark Sector: Insights from DESI DR2 via a Data-Driven Approach
• Generalized interacting Barrow Holographic Dark Energy: cosmological predictions and thermodynamic considerations
• Quantum Entropy-Driven Modifications to Holographic Dark Energy in $f(G,T)$ Gravity
• Cosmic distance duality after DESI 2024 data release and dark energy evolution

Cited by in corpus (9)

• Joint Constraints on Neutrinos and Dynamical Dark Energy in Minimally Modified Gravity
• Topological and optical signatures of modified black-hole entropies
• Barrow holographic dark energy interacting model in the presence of radiation and matter
• Hints Beyond $\Lambda$CDM from Barrow and Tsallis Holographic Dark Energy with GO cutoff
• Modified cosmology through generalized mass-to-horizon entropy: observational constraints from DESI DR2 BAO data
• Testing Gauss-Bonnet Gravity with DESI BAO Data
• Observational constraints on Luciano-Saridakis entropic cosmology
• Observational constraints on the modified cosmology inspired by string T-duality
• Breaking Free from the Swampland of Impossible Universes through the DESI Portal