Scientific American: Was Light Faster in the Past?
If matter in motion is too slow for light, why not make the speed of light faster and faster into the past? Throwing out heavyweight Einstein and his near constant speed of light is no easy task. Yet that is the burden of the new iconoclasts. Maybe they can make a cosmos with wildly varying speeds of light, and maybe they can keep the gas uniform, but they give no clear reward for so denying our well-tested Einstein on this theorist's journey into the past. Their strongest argument is the very flatness of space: it turns out that a cosmos with a changing speed of light must be a flat one and a uniform one as well, if energy is to be conserved. There is much more to be said about the untested physics of these variable vacuum light speeds. More than one form of theory is out there, to say nothing of the myriad options opened by multiple dimensions.link
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