Uniqueness of M-theory PP-Wave Background with Extra Supersymmetries

Details Uniqueness of M-theory PP-Wave Background with Extra Supersymmetries Uniqueness of M-theory PP-Wave Background with Extra Supersymmetries

2003-05-24

arxiv.org/abs/hep-th/0305215v5

Phys.Rev. D69 (2004) 066006

Physics

High Energy Physics

High Energy Physics - Theory

25 pages, LaTeX2e, comments added, version to appear in PRD

Scientific paper

10.1103/PhysRevD.69.066006

We examine Killing spinor equations of the general eleven-dimensional pp-wave backgrounds, which contain a scalar H(x^m,x^-) in the metric and a three-form \xi(x^m,x^-) in the flux. Considering non-harmonic extra Killing spinors, we show that if the backgrounds admit at least one extra Killing spinor in addition to the standard 16 Killing spinors, they can be reduced to the form with H=A_{mn}(x^-)x^mx^n and \xi(x^-) modulo coordinate transformations. We further examine the cases in which the extra Killing spinor is characterized by a set of Cartan matrices. The super-isometry algebras of the resulting backgrounds are also derived.

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