String Interactions in PP-Waves
Rajesh Gopakumar
Abstract
We argue that string interactions in a PP-wave spacetime are governed by an effective coupling geff=gs(μp+)f(μp+ ) where f(μp+ ) is proportional to the light cone energy of the string states involved in the interaction. This simply follows from generalities of a Matrix String description of this background. geff nicely interpolates between the expected result (gs) for flat space (small μp+) and a recently conjectured expression from the perturbative gauge theory side (large μp+).
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