Recall from Chapter 5 that special relativity addresses the relationship between the speed of light and time. The BGV theorem applies to any universe that meets very general conditions, including those implied by inflationary cosmological models. As Alexander Vilenkin explained, “A remarkable thing about this theorem is its sweeping generality. We made no assumptions about the material content of the universe. We did not even assume that gravity is described by Einstein’s equations. So, if Einstein’s gravity requires some modification, our conclusion will still hold. The only assumption that
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