Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1995-10-16
Nucl.Phys. B462 (1996) 213-248
Physics
High Energy Physics
High Energy Physics - Theory
45 p. (Replaced sentence on non-local terms and added 2 references)
Scientific paper
10.1016/0550-3213(95)00679-6
Two-dimensional sigma models are defined for the new manifestly spacetime supersymmetric description of four-dimensional compactified superstrings. The resulting target-superspace effective action is constrained by the way the spacetime dilaton couples to the worldsheet curvature: For the heterotic superstring, the worldsheet curvature couples to the real part of a chiral multiplet, and for Type II it couples to the real part of the sum of a vector multiplet and a tensor hypermultiplet. For the Type II superstring, this contradicts the standard folklore that only a hypermultiplet counts string-loops, explains the peculiar dilaton coupling of Ramond-Ramond fields, and allows the effective action to be easily written in N=2 4D superspace. It also implies that vector multiplet interactions get no quantum corrections, while hypermultiplet interactions can only get corrections if mirror symmetry is non-perturbatively broken.
Berkovits Nathan
Siegel Warren
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