paper

Timelike T-Duality, de Sitter Space, Large Gauge Theories and Topological Field Theory

arXiv:hep-th/9806146 · doi:10.1088/1126-6708/1998/07/021

Abstract

T-Duality on a timelike circle does not interchange IIA and IIB string theories, but takes the IIA theory to a type theory and the IIB theory to a type theory. The type theories admit E-branes, which are the images of the type II D-branes under timelike T-duality and correspond to imposing Dirichlet boundary conditions in time as well as some of the spatial directions. The effective action describing an E-brane is the -dimensional Euclidean super-Yang-Mills theory obtained by dimensionally reducing 9+1 dimensional super-Yang-Mills on spatial dimensions and one time dimension. The theory has a solution which is the product of 5-dimensional de Sitter space and a 5-hyperboloid, and the E4-brane corresponds to anon-singular complete solution which interpolates between this solution and flat space. This leads to a duality between the large limit of the Euclidean 4-dimensional U(N) super-Yang-Mills theory and the string theory in de Sitter space, and both are invariant under the same de Sitter supergroup. This theory can be twisted to obtain a large topological gauge theory and its topological string theory dual. Flat space-time may be an unstable vacuum for the type theories, but they have supersymmetric cosmological solutions.

47 pages, 1 Postscript figure, uses phyzzx macro. Monor corrections

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