IIB PP-Waves with Extra Supersymmetries
نویسنده
چکیده
We examine Killing spinor equations of the general IIB pp-wave backgrounds, which contain a scalar H(xm, x) in the metric and a self-dual four-form ξ(xm, x) in the self-dual five-form flux. We find that if the backgrounds admit at least one extra Killing spinor characterized by mutually commuting projection operators in addition to 16 standard Killing spinors, backgrounds must reduce to the form with H = Am(x m)2 and ξ = constant, modulo coordinate transformations. Solving Killing spinor equations, we find IIB pp-wave backgrounds which admit 18, 20, 24 and 32 Killing spinors.
منابع مشابه
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