English

Investigating cosmic distance duality and dark energy evolution through intermediate and high-z probes

Cosmology and Nongalactic Astrophysics 2026-05-05 v1

Abstract

We investigate deviations from the cosmic distance duality relation adopting model-dependent and -independent approaches using i) a Taylor expansion, ii) a power-law parameterization, iii) a logarithmic correction, iv) a (2;1) Pad\'e polynomial and v) a second order Chebyshev parameterization. We derive constraints on all parameters using observational Hubble data, galaxy clusters, type Ia supernovae, DESI data and gamma-ray bursts. Through Monte-Carlo Markov chain analyses adopting the Metropolis Hastings algorithm, we find no significant violation of duality, then model selection criteria favor flat scenarios even though a slight curvature is not totally ruled out. For the H0H_0 tension we find a preference at 11-σ\sigma for h0R=0.730±0.010h^R_0=0.730\pm0.010 from supernovae when dropping DESI data and for h0P=0.674±0.005h^P_0=0.674\pm 0.005 from Planck when using DESI and gamma-ray bursts.

Keywords

Cite

@article{arxiv.2605.02428,
  title  = {Investigating cosmic distance duality and dark energy evolution through intermediate and high-z probes},
  author = {Anna Chiara Alfano},
  journal= {arXiv preprint arXiv:2605.02428},
  year   = {2026}
}

Comments

Proceeding AstroMarche2 conference, September 2025, Accepted for publication in IJMPA, 9 pages, 3 tables