Periods of Feynman Diagrams and GKZ D-Modules
  We study differential equations for Feynman amplitudes and we show that the corresponding D-module is isomorphic to a GKZ D-modules. We show that the sheaf of solutions to the D-module is isomorphic to a certain relative homology and the amplitudes are periods of a relative motive. Using these ideas, we develop a method of regularization which specializes to dimensional regularization and analytic regularization. 
Emad Nasrollahpoursamami
math-ph math.AG math.CO math.MP