Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2001-05-02
Gen.Rel.Grav. 34 (2002) 1121-1128
Physics
High Energy Physics
High Energy Physics - Theory
9 pages
Scientific paper
In the No-boundary Universe with $d=11$ supergravity, under the $S_n \times S_{11-n}$ Kaluza-Klein ansatz, the only seed instanton for the universe creation is a $S_7 \times S_4$ space. It is proven that for the Freund-Rubin, Englert and Awada-Duff-Pope models the macroscopic universe in which we are living must be 4- instead of 7-dimensional without appealing to the anthropic principle.
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