Higher differential operators and genera of algebraic varieties

We will describe a generalization of the algebra of differential operators, which gives a

geometric approach to quantization of cotangent field theories. This construction is compatible

with "integration" thus giving a local-to-global construction of volume forms on derived mapping

spaces using a version of non-abelian duality. These volume forms give interesting invariants of

varieties such as the Todd genus, the Witten genus and the B-model operations on Hodge

cohomology.