Did the Universe have a beginning?
- 15 September 1992
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review D
- Vol. 46 (6) , 2355-2361
- https://doi.org/10.1103/physrevd.46.2355
Abstract
It is argued that ‘‘eternal inflation’’ must have a beginning in time. Conditions are formulated for a spacetime to describe an eternally inflating universe without a beginning, and it is shown that these conditions cannot be satisfied. A rigorous proof is given for a two-dimensional spacetime, and a plausibility argument for four dimensions.Keywords
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