Alleviating the $H_0$ tension in Rastall gravity

The tension between measurements of the Hubble constant $H_0$ locally and the value inferred from Planck satellite have provided a strong motivation to explore theoretical frameworks beyond the standard cosmological model ($\Lambda$CDM). To this aim, we investigate the $H_0$ tension in the Rastall $\Lambda$CDM model (R-$\Lambda$CDM), formulated within the Rastall gravity framework as a phenomenological extension of General Relativity featuring a non-conserved energy-momentum tensor. To constrain the cosmological parameters, we employ a comprehensive combined dataset including Big Bang Nucleosynthesis (BBN), Hubble parameter $H(z)$, Type Ia supernovae (SNe Ia), Baryon Acoustic Oscillations (BAO), Cosmic Microwave Background (CMB) anisotropies, and the growth rate of cosmic structures $f(z)\sigma_8(z)$. The estimation of model parameters is performed via Markov Chain Monte Carlo (MCMC) sampling within a Bayesian statistical framework. Our results show that the R-$\Lambda$CDM model, especially in closed geometry, reduces the $H_0$ tension, bringing the discrepancy with the local SH0ES measurements down to $1.97\sigma$ to $2.18\sigma$. However, the tension related to the $\sigma_8$ parameter remains unresolved.

• Publication year

  2025

• Venue

  Unknown venue

• Publication date

  2025-08-26

• Fields of study

  Physics

• Identifiers
  arXiv 2508.20129
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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