Cosmologist João Magueijo proposes that during the early stages of the Big Bang, the speed of light was many times greater than it is today, as much as 60 orders of magnitude. His theory attempts to answer the horizon problem in the Big Bang Theory. He does not propose the actual physics for such a variable speed of light, only suggesting that such a change in our theory fits with the observations/measurements of universal CMB and cosmic inflation. Here is my question. If he is correct, is it reasonable in a story to postulate about his theory in such a way as to allow intra galactic space travel and possibly even intergalactic travel? Perhaps Star Trek's "Warp Factor such and such" could actually be possible if Magueijo's theory leads to an understanding of the underlying mechanism for multiple-c speeds. Note: many physicists regard Magueijo with skepticism for questioning the accepted notion that the speed of light is rigidly set, but I watched an hour long show about his theory and it made perfect sense to me. What do you think about using such obscure theories in our sci-fi writing?