Constraints on the time variation of the fine structure constant by the 5-year WMAP data

Masahiro Nakashima, Ryo Nagata, Jun'ichi Yokoyama

The constraints on the time variation of the fine structure constant at recombination epoch relative to its present value, $Δα/α\equiv (α_{\mathrm{rec}} - α_{\mathrm{now}})/α_{\mat…