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arXiv · 1309.5865

The elliptic dilogarithm for the sunset graph

Spencer Bloch·Pierre Vanhove
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Abstract

We study the sunset graph defined as the scalar two-point self-energy at two-loop order. We evaluate the sunset integral for all identical internal masses in two dimensions. We give two calculations for the sunset amplitude; one based on an interpretation of the amplitude as an inhomogeneous solution of a classical Picard-Fuchs differential equation, and the other using arithmetic algebraic geometry, motivic cohomology, and Eisenstein series. Both methods use the rather special fact that the amplitude in this case is a family of periods associated to the universal family of elliptic curves over the modular curve X_1(6). We show that the integral is given by an elliptic dilogarithm evaluated at a sixth root of unity modulo periods. We explain as well how this elliptic dilogarithm value is related to the regulator of a class in the motivic cohomology of the universal elliptic family.

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Spencer Bloch, Pierre Vanhove. 2014-10-24. The elliptic dilogarithm for the sunset graph. https://doi.org/10.1016/j.jnt.2014.09.032

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