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Strings in plane-fronted gravitational waves

C. Duval, Z. Horvath, P. A. Horvathy

hep-tharXiv:hep-th/0602128

Abstract

Brinkmann's plane-fronted gravitational waves with parallel rays --~shortly pp-waves~-- are shown to provide, under suitable conditions, exact string vacua at all orders of the sigma-model perturbation expansion.

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