Particles, Fields, and Beyond: Toward a State- and Structure-Based Ontology in Fundamental Physics

This record contains the introductory paper of a coherent research program composed of six interconnected scientific publications. The introductory paper is conceived as a unifying conceptual framework for two complementary research lines developed across the six papers: Supersymmetry and emergent theoretical structures, with particular focus on entities that are mathematically and geometrically necessary but not directly falsifiable through standard collider experiments. This line includes a supergeometric reinterpretation of the gravitino mass, an analysis of non-particle structures in supersymmetric theories, and a conceptual bridge between supersymmetric structures and a structured-vacuum approach. Second Physics, a generalized physical framework in which the vacuum is modeled as a structured, multiscale, spin-active medium endowed with internal degrees of freedom and memory. This line includes the foundational formulation of Second Physics, the definition of its extended state space, and a detailed ontological analysis addressing thermodynamics, observability, physical scale, and coupling to matter. The introductory paper does not replace the individual publications, but provides the logical and ontological context necessary to read them as parts of a single theoretical trajectory. It clarifies the motivation, scope, and internal coherence of the program, highlighting a common conceptual shift from a particle-centered ontology toward a state- and structure-based description of physical reality. The six papers referenced in this introduction are released as separate publications and are intended to be read together. This Zenodo record may be updated to reflect the progressive completion and release of the associated works.