It is often claimed that the fine-structure "constant" $\ensuremath{\alpha}$ is shown to be strictly constant in time by a variety of astronomical and geophysical results. These constrain its fractional rate of change $\frac{\stackrel{\ifmmode \dot{}\else \.{}\fi{}}{\ensuremath{\alpha}}}{\ensuremath{\alpha}}$ to at least some orders of magnitude below the Hubble rate ${H}_{0}$. We argue that the conclusion is not as straightforward as claimed since there are good physical reasons to expectâ€¦Â Expand

The Theoretical Significance of Experi mental Relativity

1965

A Meisels, dissertation

Latin) indices are spacetime (space) indices; the summation convention applies; semicolon denotes covariant derivative; g denotes determinant of metric g&

Other conceivable behaviors such as ln~x~and exp( -1/x ) are singular and lead to varying signs for f' and f