English

Constraints on Tsallis cosmology using recent low and high redshift measurements

Cosmology and Nongalactic Astrophysics 2024-07-23 v2 General Relativity and Quantum Cosmology

Abstract

Recently Tsallis cosmology has been presented as a novel proposal for alleviating both H0H_0 and σ8\sigma_8 tensions. Hence a universe filled with matter and radiation as perfect fluids and considering the Tsallis entropy is confronted using recent cosmological measurements coming from cosmic chronometers, type Ia supernovae, hydrogen II galaxies, quasars, and baryon acoustic oscillations. Following a Bayesian Monte Carlo Markov Chain analysis and combining the samples, we constrain the main characteristic parameters α=1.0310.051+0.054\alpha = 1.031^{+0.054}_{-0.051} and δ=1.0050.001+0.001\delta = 1.005^{+0.001}_{-0.001} where the uncertainties are 1σ1\sigma confidence level. Additionally, we estimate the current deceleration parameter q0=0.5300.017+0.018q_0=-0.530^{+0.018}_{-0.017}, the deceleration-acceleration transition redshift zT=0.6320.028+0.028z_T=0.632^{+0.028}_{-0.028} and the age of the universe τU=12.6370.066+0.067Gyrs\tau_U = 12.637^{+0.067}_{-0.066}\,\rm{Gyrs} which are in agreement with the standard cosmology (Λ\LambdaCDM) within 1.5σ1.5\sigma. Furthermore, we find that the dark energy equation of state is consistent with both phantom and quintessence behaviors within 1σ1\sigma in the past and converging to Λ\LambdaCDM in the future. Additionally, we find agreement values of H0H_0 within 1σ1\sigma with the SH0ES values when the CMB distance priors are added to the analysis, suggesting that H0H_0 tension could be alleviated. Finally, Tsallis cosmology is preferred over Λ\LambdaCDM by the combined data that motives further studies at the perturbation level.

Keywords

Cite

@article{arxiv.2404.18346,
  title  = {Constraints on Tsallis cosmology using recent low and high redshift measurements},
  author = {M. L. Mendoza-Martínez and A. Cervantes-Contreras and J. J. Trejo-Alonso and A. Hernandez-Almada},
  journal= {arXiv preprint arXiv:2404.18346},
  year   = {2024}
}

Comments

9 pages, 2 figures, 2 tables. Version accepted in EPJC

R2 v1 2026-06-28T16:09:11.208Z