Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2001-12-18
Class.Quant.Grav. 19 (2002) 2699-2716
Physics
High Energy Physics
High Energy Physics - Theory
21 pages; v2: relation of string amplitudes to the effective action clarified, discussion of the superfield expanded, main con
Scientific paper
10.1088/0264-9381/19/10/312
We report on progress made in the construction of higher-derivative superinvariants for type-II theories in ten dimensions. The string amplitude calculations required for this analysis exhibit interesting features which have received little attention in the literature so far. We discuss two examples from a forthcoming publication: the construction of the (H_{NS})^2 R^3 terms and the fermionic completion of the \epsilon\epsilon R^4 terms. We show that a correct answer requires very careful treatment of the chiral splitting theorem, implies unexpected new relations between fermionic correlators, and most interestingly, necessitates the use of worldsheet gravitino zero modes in the string vertex operators. In addition, we discuss the relation of our results to the predictions of the linear scalar superfield of the type-IIB theory and find (and explain) an interesting discrepancy.
Peeters Kasper
Vanhove Pierre
Westerberg Anders
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