I was reading about Kugelblitz on Wikipedia, and it says that if enough energy gets concentrated it leads to a black hole (from where nothing can escape - supposedly). So, if during the Big-Bang, when all the energy of the universe was in a really small region of space, why didn't it lead to a black hole and stay forever like that?
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1A bh is an object in space, but not space itself – planetmaker Mar 21 '22 at 00:32
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Please see Did the Big Bang happen at a point? – PM 2Ring Mar 21 '22 at 08:24
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Related: Observable universe equals its Schwarzschild radius (event horizon)? – pela Mar 21 '22 at 10:20
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While it is possible that some black holes (called primordial black holes) were formed in the early universe, in general most of the matter-energy did not collapse into these, since while extremely dense, early universe was also extremely uniform: there simply wasn't significant enough concentrations of mass-energy to form such black holes before the universe expanded rapidly in the inflation phase.
tuomas
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