Period Integrals and Tautological Systems
  We study period integrals of CY hypersurfaces in a partial flag variety. We construct a holonomic system of differential equations which govern the period integrals. By means of representation theory, a set of generators of the system can be described explicitly. The results are also generalized to CY complete intersections. The construction of these new systems of differential equations have lead us to the notion of a tautological system. 
Bong H. Lian, Ruifang Song and Shing-Tung Yau
math.AG math-ph math.MP