Time variation of the electron mass in the early universe and the Barrow-Magueijo model

TL;DR

This paper investigates how the electron mass varied in the early universe by analyzing primordial element abundances and cosmic data, testing the Barrow-Magueijo model and providing new constraints on its parameters.

Contribution

It offers the first combined analysis of early and late universe data to constrain the time variation of the electron mass within the Barrow-Magueijo model.

Findings

Constraints on the variation of electron mass during the early universe.

Disagreement with previous results on the model's parameters.

New bounds on the model parameter Gω/c^4.

Abstract

We put limits on the time variation of the electron mass in the early universe using observational primordial abundances of D, He4 and Li7, recent data from the Cosmic Microwave Background and the 2dFGRS power spectrum. Furthermore, we use these constraints together with other astronomical and geophysical bounds from the late universe to test Barrow-Magueijo's model for the variation in m_e. From our analysis we obtain -0.615 < G\omega/c^4 < -0.045 (3\sigma interval) in disagreement with the result obtained in the original paper.