If you’re five minutes late, just keep walking to Canada
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. […]
“It’s a model that I do not believe has anything to do with reality,” says Sabine Hossenfelder of the Nordic Institute for Theoretical Physics.
