Strings in plane-fronted gravitational waves
arXiv:hep-th/0602128 · doi:10.1142/S0217732393003482
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.
7 pages, no figures
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