Relational Coexistence Theory (TCR): Quantum and Cosmological foundations.

This work presents a theoretical framework in physics, deposited as a preprint to establish priority and ensure open access. The "Teoria della Coesistenza Relazionale" (TCR, Relational Coexistence Theory) proposes an ontological model in which spacetime (R) is not the fundamental level of reality, but rather the emergent manifestation of an original relational domain (R′). Within this framework, Quantum Mechanics and General Relativity are addressed simultaneously, suggesting unified explanations for phenomena usually treated separately, such as interference, entanglement, decoherence, cosmic expansion, and the arrow of time. The strength of TCR lies not in mathematical complexity but in the parsimony of its ontological foundation. From R′, multidisciplinary consequences naturally emerge, linking microscopic and cosmological scales. The theory is presented as an open research program: it offers preliminary experimental predictions, leaves room for mathematical development, and provides a unified reinterpretation of several well-known paradoxes of modern physics.