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Originally Posted by Unknown User
But I don't think it is possible to pull something out of absolute nothing
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You can think that it is impossible, based on your experience with the world around you, and perhaps you are right, but I think you'd have to agree that very little about our current laws of physics as we understand them today has to have been valid at the moment that the universe started.
It could well be the case that in the first yoctosecond, that the speed of light was not a limit, and that there was no conservation of energy, momentum, or even lepton number. The universe was pretty different back then. The things you know, based on seeing large sparse clumps of cold solidified matter just don't apply.