Strings in Nontrivial Gravitino and Ramond-ramond Backgrounds


In this paper we discuss deformations of the BRST operator of the fermionic string. These deformations preserve inlpotency of the BRST operator and correspond to turning on infinitesimal Gravitino and Ramond-Ramond spacetime fields. One of the outstanding problems of string theory is to understand the equations of motion for… (More)