Berkovits, N.Maldacena, J.2014-05-202014-05-202002-10-01Journal of High Energy Physics. Trieste: Int School Advanced Studies, n. 10, 14 p., 2002.1029-8479http://hdl.handle.net/11449/23782Using the U(4) formalism developed ten years ago, the worldsheet action for the superstring in Ramond-Ramond plane wave backgrounds is expressed in a manifestly N = (2, 2) superconformally invariant manner. This simplifies the construction of consistent Ramond-Ramond plane wave backgrounds and eliminates the problems associated with light-cone interaction point operators.14engsuperstrings and heterotic stringsPenrose limit and pp-wave backgroundArtigoWOS:000180552900059Acesso aberto