Exact thresholds and instanton effects in D=3 string theories

Details Exact thresholds and instanton effects in D=3 string theories Exact thresholds and instanton effects in D=3 string theories

2000-06-13

arxiv.org/abs/hep-th/0006088v1

JHEP 0007 (2000) 003

Physics

High Energy Physics

High Energy Physics - Theory

15 pages, JHEP style

Scientific paper

10.1088/1126-6708/2000/07/003

Three-dimensional string theories with 16 supersymmetries are believed to possess a non-perturbative U-duality symmetry $SO(8,24,\Zint)$. By covariantizing the heterotic one-loop amplitude under U-duality, we propose an exact expression for the $(\partial \phi)^4$ amplitude, that reproduces known perturbative limits. The weak-coupling expansion in either of the heterotic, type II or type I descriptions exhibits the well-known instanton effects, plus new contributions peculiar to three-dimensional theories, including the Kaluza-Klein 5-brane, for which we extract the summation measure. This letter is a post-scriptum to hepth/0001083.

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