Anatomy of a gauge theory
Abstract
Description
We exhibit the role of Hochschild cohomology in quantum field theory with particular emphasis on gauge theory and Dyson--Schwinger equations, the quantum equations of motion. These equations emerge from Hopf- and Lie algebra theory and free quantum field theory only. In the course of our analysis we exhibit an intimate relation between the Slavnov-Taylor identities for the couplings and the existence of Hopf sub-algebras defined on the sum of all graphs at a given loop order, surpassing the need to work on single diagrams.
25p, uses feynmf, typos corrected, references added, to appear in Annals of Physics
25p, uses feynmf, typos corrected, references added, to appear in Annals of Physics