Constraining the time variation of the coupling constants from cosmic microwave background: effect of Λ_{QCD}

Masahiro Nakashima, Kazuhide Ichikawa, Ryo Nagata +1

We investigate constraints on the time variation of the fine structure constant between the recombination epoch and the present epoch, Δα/α\equiv (α_{rec} - α_{now})/α_{now}, from…