Berkovits, N.2014-05-202014-05-202000-03-07Classical and Quantum Gravity. Bristol: Iop Publishing Ltd, v. 17, n. 5, p. 971-978, 2000.0264-9381http://hdl.handle.net/11449/23316Sigma model actions are constructed for the type II superstring compactified to four-and six-dimensional curved backgrounds which can contain non-vanishing Ramond-Ramond fields. These actions are N = 2 worldsheet superconformally invariant and can be covariantly quantized preserving manifest spacetime supersymmetry. They are constructed using a hybrid Version of superstring variables which combines features of the Ramond-Neveu-Schwarz and Green-Schwarz formalisms. For the AdS(2) x S-2 and AdS(3) x S-3 backgrounds, these actions differ from the classical Green-Schwarz actions by a crucial kinetic term for the fermions. Parts of this work have been done in collaborations with M Bershadsky, T Hauer, W Siegel, C Vafa, E Witten, S Zhukov and B Zwiebach.971-978engArtigo10.1088/0264-9381/17/5/306WOS:000086104100007Acesso restrito