Constraints on thawing scalar field models from fundamental constants

TL;DR

This paper constrains thawing scalar field dark energy models using observational data on variations in the fine structure constant, finding that some models near the cosmological constant are excluded at 1σ, but ΛCDM remains consistent at 2σ.

Contribution

It introduces constraints on thawing scalar field dark energy models based on fundamental constant variations, linking cosmological parameters with observational data.

Findings

Some thawing models near w0=-1 are excluded at 1σ

ΛCDM model remains consistent with data at 2σ

Variation of fine structure constant can constrain dark energy models

Abstract

We consider a dark energy model with a relation between the equation of state parameter $w$ and the energy density parameter $\Omega_\phi$ derived from thawing scalar field models. Assuming the variation of the fine structure constant is caused by dark energy, we use the observational data of the variation of the fine structure constant to constrain the current value of $w_0$ and $\Omega_{\phi 0}$ for the dark energy model. At the $1\sigma$ level, the observational data excluded some areas around $w_0=-1$, which explains the positive detection of the variation of the fine structure constant at the $1\sigma$ level, but $\Lambda$CDM model is consistent with the data at the $2\sigma$ level.