Graph Reconstruction, Functorial Feynman Rules and Superposition Principles

In this article functorial Feynman rules are introduced as large generalizations of physicists Feynman rules, in the sense that they can be applied to arbitrary classes of hypergraphs, possibly endowed with any kind of structure on their vertices and hyperedges. We show that the reconstruction conjecture for classes of (possibly structured) hypergraphs admit a sheaf-theoretic characterization, allowing us to consider analogous conjectures. We propose an axiomatization for the notion of superposition principle and prove that the functorial Feynman rules work as a bridge between reconstruction conjectures and superposition principles, meaning that a conjecture for a class of hypergraphs is satisfied only if each functorial Feynman rule defined on it induces a superposition principle. Applications in perturbative euclidean quantum field theory and graph theory are given