In a "Rainbow" Universe Time May Have No Beginning

09 Dec 2013 12:12 #1 by Grady

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.

Rainbow gravity was first proposed 10 years ago as a possible step toward repairing the rifts between the theories of general relativity (covering the very big) and quantum mechanics (concerning the realm of the very small). The idea is not a complete theory for describing quantum effects on gravity, and is not widely accepted. Nevertheless, physicists have now applied the concept to the question of how the universe began, and found that if rainbow gravity is correct, spacetime may have a drastically different origin story than the widely accepted picture of the big bang.

Scientific American

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09 Dec 2013 12:50 #2 by JMC
Great post, love thinking about these issues.

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09 Dec 2013 13:13 #3 by homeagain
A Discovery Channel series "Thru the Wormhole" narrated by Morgan Freeman.....opens the
spectrum of MANY things regarding the universe....our understanding of the universe is in it's
infancy and from my POV EVERYTHING is possible and in fact, probable......we have NOT progressed (as a species) to FULLY comprehend the complexity of the cosmos.

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