Investigating cosmic distance duality and dark energy evolution through intermediate and high-z probes
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 tension we find a preference at - for from supernovae when dropping DESI data and for from Planck when using DESI and gamma-ray bursts.
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