Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2000-12-08
JHEP 0103 (2001) 027
Physics
High Energy Physics
High Energy Physics - Theory
17 pages, 1 figure, LATEX, uses JHEP.cls, references added
Scientific paper
10.1088/1126-6708/2001/03/027
We study some aspects of the Kaluza-Klein Melvin solution in M-theory. The associated magnetic field has a maximal critical value $B=\pm 1/R$ where $R$ is the radius of the compactification circle. It is argued that the Melvin background of type IIA with magnetic field $B$ and of type 0A with magnetic field $B'=B-1/R$ are equivalent. Evidence for this conjecture is provided using a further circle compactification and a `9-11' flip. We show that partition functions of nine-dimensional type IIA strings and of a $(-1)^F\sigma_{1/2}$ type IIA orbifold both with NS-NS Melvin fluxtubes are related by such shift of the magnetic field. Then the instabilities of both IIA and 0A Melvin solutions are analyzed. For each theory there is an instanton associated to the decay of spacetime. In the IIA case the decay mode is associated to the nucleation of $D6/D\bar{6}$-brane pairs, while in the 0A case spacetime decays through Witten's bubble production.
Costa Silvana M.
Gutperle Michael
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