# Probing cosmic acceleration by strong gravitational lensing systems

## TL;DR

This study uses strong gravitational lensing data to compare cosmological models, finding strong evidence that supports the flat DM model with cosmic acceleration over alternative models.

## Contribution

It provides a model comparison using gravitational lensing data, strengthening the case for DM as the correct description of cosmic acceleration.

## Key findings

- Flat DM model is strongly supported over power-law and R_h=ct models.
- Bayesian evidence favors DM with DM's non power-law expansion.
- Strong gravitational lensing effectively probes cosmic acceleration.

## Abstract

Recently, some divergent conclusions about cosmic acceleration were obtained using type Ia supernovae (SNe Ia), with opposite assumptions on the intrinsic luminosity evolution. In this paper, we use strong gravitational lensing systems to probe the cosmic acceleration. Since the theory of strong gravitational lensing is established certainly, and the Einstein radius is determined by stable cosmic geometry. We study two cosmological models, $\Lambda$CDM and power-law models, through 152 strong gravitational lensing systems, incorporating with 30 Hubble parameters $H(z)$ and 11 baryon acoustic oscillation (BAO) measurements. Bayesian evidence are introduced to make a one-on-one comparison between cosmological models. Basing on Bayes factors $\ln B$ of flat $\Lambda$CDM versus power-law and $R_{h}=ct$ models are $\ln B>5$, we find that the flat $\Lambda$CDM is strongly supported by the combination of the datasets. Namely, an accelerating cosmology with non power-law expansion is preferred by our numeration.