Becchi-Rouet-Stora-Tyutin symmetry, differential geometry, and string field theory

Abstract
We introduce a generalized concept of differential geometry in which the usual first-order derivative is replaced by more general operators, for example, the Virasoro operators. These pseudo-derivatives are covariantized by introducing the analogs of spin connections and vierbeins. The resulting field-dependent curvatures and torsions are used to build a ‘‘geometrical’’ Becchi-Rouet-Stora-Tyutin (BRST) operator which plays a role analogous to the ‘‘exterior derivative’’ in the construction of generalized BRST-invariant gauge field theories. Possible geometrical approaches to string fields and dynamics are suggested and partially explored.

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