Cosmological constraints on $\Lambda(\alpha)$CDM models with time-varying fine structure constant

TL;DR

This paper investigates cosmological models where the cosmological constant depends on a time-varying fine structure constant, using observational data to constrain the model parameters with improved accuracy.

Contribution

It provides new constraints on $\Lambda(\alpha)$CDM models with one and two parameters, incorporating extensive observational data on the fine structure constant.

Findings

Model parameters constrained around 10^{-4}

Constraints are more accurate than previous studies

Supports the viability of $\Lambda(\alpha)$CDM models

Abstract

We study the $\Lambda(\alpha)$CDM models with $\Lambda(\alpha)$ being a function of the time-varying fine structure constant $\alpha$. We give a close look at the constraints on two specific $\Lambda(\alpha)$CDM models with one and two model parameters, respectively, based on the cosmological observational measurements along with 313 data points for the time-varying $\alpha$. We find that the model parameters are constrained to be around $10^{-4}$, which are similar to the results discussed previously but more accurately.