Heterotic / type I duality and D-brane instantons

Abstract

We study heterotic/type I duality in d=8,9 uncompactified dimensions. We consider the special (``BPS saturated'') F^4 and R^4 terms in the effective one-loop heterotic action, which are expected to be non-perturbatively exact. Under the standard duality map these translate to tree-level, perturbative and non-perturbative contributions on the type I side. We check agreement with the one-loop open string calculation, and discuss the higher-order perturbative contributions, which arise because of the mild non-holomorphicities of the heterotic elliptic genus. We put the heterotic world-sheet instanton corrections in a form that can be motivated as arising from a D-brane instanton calculation on the type-I side.

latex 23 pages, 3 figures eps included. Final version to appear in Nuclear Physics B

References in corpus (10)

• Matrix String Theory
• Effects of D-instantons
• One loop in eleven dimensions
• D-instantons, Strings and M-theory
• Heterotic Matrix String Theory
• Duality of N=2 Heterotic -- Type I Compactifications in Four Dimensions
• Instantons, Scale Invariance and Lorentz Invariance in Matrix Theory
• Dilute D-Instantons at Finite Temperature
• Fermion Exchange between D-instantons
• Systematics of string loop threshold corrections in orbifold models

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