Year: 2025
Type: article
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 Δ. Interestingly, this framework exhibits similarities with cosmology based on Tsallis δ-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 Δ is found to be negative, while the zero value, which corresponds to ΛCDM paradigm, is allowed only in the range of 2σ for three out of four datasets. Additionally, for the case of the SN0+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 ΛCDM cosmology, showing that the latter is slightly favoured.
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funder: Universitat de Lleida
OpenAlex ID: W4413991147