In a "Rainbow" Universe Time May Have No Beginning
If different wavelengths of light experience spacetime differently, the big bang may never have happened
What if the universe had no beginning, and time stretched back infinitely without a big bang to start things off? That's one possible consequence of an idea called "rainbow gravity," so-named because it posits that gravity's effects on spacetime are felt differently by different wavelengths of light, aka different colors in the rainbow./.../
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