D-Instanton Corrections as (p,q)-String Effects and Non-Renormalization Theorems

Abstract

We discuss higher derivative interactions in the type IIB superstring in ten dimensions. From the fundamental string point of view, the non-perturbative corrections are due to D-instantons. We argue that they can alternatively be understood as arising from $(p,q)$-strings. We derive a non-renormalization theorem for eight-derivative bosonic interactions, which states that terms involving either NS-NS or R-R fields occur at tree-level and one-loop only. By using the $SL(2,Z)$ symmetry of M-theory on $T^2$, we show that in order for the possible $R^{3m+1}(m=1,2,...)$ interactions in M-theory to have a consistent perturbative expansion in nine dimensions, $m$ must be odd. Thus, only $R^{6N+4}(N=0,1,...)$ terms can be present in M-theory and their string theory counterparts arise at $N$ and $2N+1$ loops. Finally, we treat an example of fermionic term.

24 pages, latex, additional arguments for the perturbative form of the eight-derivative interactions

References in corpus (3)

• Effects of D-instantons
• One loop in eleven dimensions
• D-instantons, Strings and M-theory

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