Duality and the signature of space-time

Versions of M-theory are found in spacetime signatures (9,2) and (6,5), in addition to the usual M-theory in 10+1 dimensions, and these give rise to type IIA string theories in 10-dimensional spacetime signatures (10,0),(9,1),(8,2),(6,4) and (5,5), and to type IIB string theories in signatures (9,1),(7,3) and (5,5). The field theory limits are 10 and 11 dimensional supergravities in these signatures. These theories are all linked by duality transformations which can change the number of time dimensions as well as the number of space dimensions, so that each should be a different limit of the same underlying theory.

Note:

Minor changes. 52 pages, 14 Postscript figures, uses phyzzx macro

duality
space-time: signature
M-theory
string model
supersymmetry
moduli space
approximation: strong coupling
compactification: torus

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