What is the trouble with Dyson--Schwinger equations?

Details What is the trouble with Dyson--Schwinger equations? What is the trouble with Dyson--Schwinger equations?

2004-07-02

arxiv.org/abs/hep-th/0407016v1

Physics

High Energy Physics

High Energy Physics - Theory

5 pages contributed to the proceedings "Loops and Legs 2004", April 2004, Zinnowitz, Germany

Scientific paper

10.1016/j.nuclphysbps.2004.09.01

We discuss similarities and differences between Green Functions in Quantum Field Theory and polylogarithms. Both can be obtained as solutions of fixpoint equations which originate from an underlying Hopf algebra structure. Typically, the equation is linear for the polylog, and non-linear for Green Functions. We argue though that the crucial difference lies not in the non-linearity of the latter, but in the appearance of non-trivial representation theory related to transcendental extensions of the number field which governs the linear solution. An example is studied to illuminate this point.

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