Time varying $\alpha$ in N=8 extended Supergravity

Abstract

There has been some evidence that the fine structure "constant" $\alpha$ may vary with time. We point out that this variation can be described by a scalar field in some supergravity theory in our toy model, for instance, the N=8 extended supergravity in four dimensions which can be accommodated in M-theory.

Comments: 5 pages,1 figures. Accepted for publication in JHEP