Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1999-10-29
Class.Quant.Grav.17:971-978,2000
Physics
High Energy Physics
High Energy Physics - Theory
Corrected a few typos, Talk given at Strings `99 in Potsdam
Scientific paper
10.1088/0264-9381/17/5/306
Sigma 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 $AdS_2\times S^2$ and $AdS_3\times S^3$ backgrounds, these actions differ from the classical Greeen-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.
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