Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1996-05-09
Nucl.Phys. B482 (1996) 119-141
Physics
High Energy Physics
High Energy Physics - Theory
25 pages, latex
Scientific paper
10.1016/S0550-3213(96)00530-5
We study the ``ordinary'' Scherk-Schwarz dimensional reduction of the bosonic sector of the low energy effective action of a hypothetical M-theory on $S^1 \times S^1 \cong T^2$. We thus obtain the low energy effective actions of type IIA string theory in both ten and nine space-time dimensions. We point out how to obtain the O(1, 1) invariance of the NS-NS sector of the string effective action correctly in nine dimensions. We dimensionally reduce the type IIB string effective action on $S^1$ and show that the resulting nine dimensional theory can be mapped, purely from the bosonic consideration, exactly to the type IIA theory by an O(1, 1) or Buscher's T-duality transformations. We then give a dynamical argument, in analogy with that for the type IIB theory in ten dimensions, to show how an S-duality in the type IIA theory can be understood from the underlying nine dimensional theory by compactifying M-theory on a T-dual torus $\tilde {T}^2$.
Das Ashok
Roy Shibaji
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