Melvin solution in string theory
arXiv:hep-th/9411198 · doi:10.1016/0370-2693(94)01682-3
Abstract
We identify a string theory counterpart of the dilatonic Melvin D=4 background describing a "magnetic flux tube" in low-energy field theory limit. The corresponding D=5 bosonic string model containing extra compact Kaluza-Klein dimension is a direct product of the D=2 Minkowski space and a D=3 conformal sigma model. The latter is a singular limit of the [SL(2,R) x R]/R gauged WZW theory. This implies, in particular, that the dilatonic Melvin background is an exact string solution to all orders in \a'. Moreover, the D=3 model is formally related by an abelian duality to a flat space with a non-trivial topology. The conformal field theory for the Melvin solution is exactly solvable (and for special values of magnetic field parameter is equivalent to CFT for a orbifold of 2-plane times a circle) and should exhibit tachyonic instabilities.
12 pages, harvmac (substantial revision, especially of the part discussing the structure of the corresponding conformal theory)
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