D-effects in Toroidally Compactified Type II String Theory

Details D-effects in Toroidally Compactified Type II String Theory D-effects in Toroidally Compactified Type II String Theory

1997-12-16

arxiv.org/abs/hep-th/9712155v1

Fortsch.Phys.47:271-277,1999

Physics

High Energy Physics

High Energy Physics - Theory

1+6 pages, neuchatel.sty included

Scientific paper

We review exact results obtained for R^4 couplings in maximally supersymmetric type II string theories. These couplings offer a privileged scene to understand the rules of semiclassical calculus in string theory. Upon expansion in weak string coupling, they reveal an infinite sum of non-perturbative e^{-1/g} effects that can be imputed to euclidean D-branes wrapped on cycles of the compactification manifolds. They also shed light on the relation between Dp-branes and D-(p-2)branes, D-strings and (p,q) strings, instanton sums and soliton loops. The latter interpretation takes over in D<=6 in order to account for the e^{-1/g^2} effects, still mysterious from the point of view of instanton calculus. [To appear in the proceedings of the conference "Quantum Aspects of Gauge Theories, Supersymmetry and Unification" held at Neuchatel University, Switzerland, 18-23 September 1997.]

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