Constraints On Dark Energy Models From Galaxy Clusters and Gravitational Lensing Data

TL;DR

This paper uses galaxy cluster observations, gravitational lensing, and cosmographic analysis to constrain dark energy models, finding that $wCDM$ and $\Lambda CDM$ are most favored, and noting a slowdown of the universe at low redshift in some models.

Contribution

It introduces a combined analysis of SZ, X-ray, and gravitational lensing data to constrain dark energy models and explores the universe's expansion behavior at low redshift.

Findings

$wCDM$ and $\Lambda CDM$ are most favored models.

Detected a slowdown in cosmic expansion at low redshift in dynamical dark energy models.

Observational data supports standard cosmological models over alternatives.

Abstract

The Sunyaev--Zel'dovich (SZ) effect is a global distortion of the Cosmic Microwave Background (CMB) spectrum as a result of its interaction with a hot electron plasma in the intracluster medium of large structures gravitationally viralized such as galaxy clusters (GC). Furthermore, this~hot gas of electrons emits X-rays due to its fall in the gravitational potential well of the GC. The~analysis of SZ and X-ray data provides a method for calculating distances to GC at high redshifts. On the other hand, many galaxies and GC produce a Strong Gravitational Lens (SGL) effect, which has become a useful astrophysical tool for cosmology. We use these cosmological tests in addition to more traditional ones to constrain some alternative dark energy (DE) models, including the study of the history of cosmological expansion through the cosmographic parameters. Using Akaike and Bayesian Information Criterion, we find that the $wCDM$ and $\Lambda CDM$ models are the most favoured by the observational data. In addition, we found at low redshift a peculiar behavior of slowdown of the universe, which occurs in dynamical DE models when we use data from GC.