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Problems with inflation theoryMathematical problems with inflation theoryDeath of the eternal cosmos Lisa Grossman/based mainly on Alexander Vilenkin New Scientist, 14 January 2012 The fashionable theory of eternal inflation at the beginning of the universe has been used to explain both the fine tuning of the laws of nature and to allow for string theory having 10500 solutions. Alexander Vilenkin of Tufts University has examined the equations relating eternal inflation to the Hubbke constant describing the expansion of the universe in Physical Review Letters, DOI: 10,1103/physrevlett.90.151301. The conclusion is that it is impossible to have a spacetime with this property, as the constant has a limit that prevents inflation. The same sort of constraint applies to the idea of cyclic universes going through endless Big Crunches followed by Big Bangs. From this Vilenkin concludes that there is no possibility of a universe that did not have a definite beginning. |
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