![]() It culminates in the crystallization of Feynman diagrams as a stand-alone theoretical device which is no longer applied to QFT, but encodes it, albeit only in the perturbative limit. This will illustrate the enormous simplification induced by Feynman diagrams when extracting physical information from a particle model. Rather, we take QFT as given, and follow the steps it takes to bring it into quantitative contact with observation. But neither do we aim at evaluating the complexity of QFT as a theory itself, for example by comparing it to possible rival theories. In this article though, we will leave most of these issues aside and focus on a very specific topic, related to the complexity of QFT when it is used to compare a specific particle model to experimental data.Without alluding to the model/theory debate (Frigg and Hartmann 2020), we will adopt the term particle model for a specific, QFT-based model (or theory) of particle interactions, such as the Standard Model or its supersymmetric generalizations. With QFT, a number of additional conceptual problems arise, mostly related to mathematical consistency (see Kuhlmann ( 2020) for details). The intricacies of the latter have been a subject of the philosophical debate since its very conception at the beginning of the twentieth century (Ismael 2020). Feynman diagrams are part of the theoretical toolbox of quantum field theory (QFT) which, loosely speaking, is the relativistic generalization of quantum mechanics. ![]()
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