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Forums
Physics
Beyond the Standard Models
What would happen if only gravitons existed?
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[QUOTE="jfizzix, post: 5453508, member: 190322"] This is similar to he hypothetical situation of if there were a universe containing only photons. At this point, no one has a tested theory of quantum gravity, so there are many possibilities, but no consensus (as yet) If there was a universe containing only photons, energy would be very nearly uniformly distributed, as even in the presence of gravity created by some blob of higher-than-background energy density, the photons would be deflected, but always traveling at the speed of light. Since Light cannot slow down, it cannot form clumps steadily growing over time like matter can. That being said, black holes could form if the energy density in one location were high enough, but this would be an incredibly unlikely occurrence. On the other hand, if we allow the possibility of photon-photon collisions happening, producing matter-antimatter pairs, then there could be matter in a photon-universe, but individually only for a short time, as the pairs would recombine and annihilate. If for whatever reason, more matter is created than antimatter (however slightly), then eventually the universe would have a significant amount of long-living matter that could form galaxies and stuff. As far as a graviton-universe goes, I expect the situation is very similar, but we simply don't know if anything gets created from colliding gravitons (if they exist at all). [/QUOTE]
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Beyond the Standard Models
What would happen if only gravitons existed?
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