Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1998-02-12
Nucl.Phys. B535 (1998) 116-138
Physics
High Energy Physics
High Energy Physics - Theory
new section on effective action, small corrections. 23 pages, harvmac
Scientific paper
10.1016/S0550-3213(98)00602-6
The construction of $SL(2,Z)$ invariant amplitudes that generalizethe Virasoro amplitude is investigated in detail. We describe a number of mathematical properties that characterize the simplest example, and present pieces of evidence that it represents the tree-level four-graviton scattering amplitude in membrane theory on ${\bf R}^9\times T^2$ in the limit that the torus area goes to zero. In particular, we show that the poles of the $S$-dual amplitude are in precise correspondence with the states of membrane theory that survive in the type IIB limit. These are shown to be the states that span the Cartan subspaces of area preserving diffeomorphisms of the 2-torus; all other states become infinitely massive, and membrane world-volume theory acquires the structure of a free theory.
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