Symmetries in Science XI pp 527-536
Combinatorial Physics, Normal Order and Model Feynman Graphs
- Cite this paper as:
- Solomon A.I., Blasiak P., Duchamp G., Horzela A., Penson K. (2004) Combinatorial Physics, Normal Order and Model Feynman Graphs. In: Gruber B.J., Marmo G., Yoshinaga N. (eds) Symmetries in Science XI. Springer, Dordrecht
The general normal ordering problem for boson strings is a combinatorial problem. In this talk we restrict ourselves to single-mode boson monomials. This problem leads to elegant generalisations of well-known combinatorial numbers, such as Bell and Stirling numbers. We explicitly give the generating functions for some classes of these numbers. Finally we show that a graphical representation of these combinatorial numbers leads to sets of model field theories, for which the graphs may be interpreted as Feynman diagrams corresponding to the bosons of the theory. The generating functions are the generators of the classes of Feynman diagrams.
KeywordsCombinatorics normal order Feynman diagrams
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