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Jan13-06, 08:03 AM
P: 391
Quote Quote by hellfire
Actually there are experimental ways to test theories with varying speed of light. One of the consequences of these theories is that the electromagnetic coupling constant [itex]\alpha=e^2/2\epsilon_0 h c[/itex] does also vary. This constant determines for example the spitting of the spectral lines of the hydrogen (the “fine-structure”). Comparing distant spectral lines with the ones of today might provide information about a varying [itex]\alpha[/itex].
for example;

on astro-ph today.