High Energy Theory Seminar

General arguments indicate that Feynman integrals can be thought as
period
integrals. In this talk we will focus on the case of the two-loop sunset
graph with internal masses.
We will show that this integral is given by a period of a variation of
a mixed Hodge structure, and can be expressed  as an elliptic
dilogarithm.  We will discuss the relation to the regulator of a class
in the motivic cohomology of the universal elliptic family.

This is based on the work [arXiv:1309.5865] done in collaboration with
Spencer Bloch