Trepp, Tenzin C. ; Pinho, Luis Gustavo B. & Mendes, Gabriela de Melo P.: Logic of ER III - Physics Underdetermination: Constructive Toy Models for a Dynamic Ontology in Spacetime and Hilbert Space

We challenge the common view that relativity and quantum formalisms compel a static block-universe ontology. Instead, we show that Existential Realism (ER) – can be formulated as an ontological extension of the specific physical models studied here, leaving empirical predictions unchanged so long as the added ER structure remains empirically idle. First, we clarify that the mathematical formalism of physics is neutral: one can impose a preferred foliation or an existence predicate without changi