Abstract
Systems of Dyson–Schwinger equation represent the equations of motion in quantum field theory. In this paper, we follow the combinatorial approach and consider Dyson–Schwinger equations as fixed point equations that determine the perturbation series by usage of graph insertion operators. We discuss their properties under the renormalization flow, prove that fixed points are scheme independent, and construct solutions for coupled systems with linearized arguments of the insertion operators.
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Acknowledgments
The author likes to thank Dirk Kreimer, Karen Yeats, Eric Panzer, and Marco Berghoff for many valuable discussions pertaining to this work. It is acknowledged that parts of the results of this work were discussed in the master’s thesis by the author of this paper [25]. This research was supported by Deutsche Forschungsgemeinschaft (DFG) through the grant KR 1401/5-1.
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Kißler, H. Systems of Linear Dyson–Schwinger Equations. Math Phys Anal Geom 22, 20 (2019). https://doi.org/10.1007/s11040-019-9320-x
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DOI: https://doi.org/10.1007/s11040-019-9320-x
Keywords
- Combinatorial Dyson-Schwinger equations
- Hopf algebras
- Renormalization
- Renormalization flow
- Callan-Symanzik equation