Truncations of the D9-brane action and type-I strings

Details Truncations of the D9-brane action and type-I strings Truncations of the D9-brane action and type-I strings

2003-01-06

arxiv.org/abs/hep-th/0301021v2

Phys.Lett. B560 (2003) 223-231

Physics

High Energy Physics

High Energy Physics - Theory

15 pages, LaTeX file. Refs. added

Scientific paper

10.1016/S0370-2693(03)00417-9

The low-energy effective action of type-I superstring theory in ten dimensions is obtained performing a truncation of type-IIB supergravity in a background where D9-branes are present. The open sector corresponds to the first order in the low-energy expansion of the D9-brane action in a type-I background. In hep-th/9901055 it was shown that there are two ways of performing a type-I truncation of the D9-brane action, and the resulting truncated action was obtained in a flat background. We extend this result to a generic type-I background, and argue that the two different truncations are in correspondence with the open sector of the low-energy effective action of the two different consistent ten-dimensional type-I string theories, namely the SO(32) superstring and the $USp(32)$ non-supersymmetric string.

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