A Structural Revision of the Definition of Energy: State-Based Framework Rooted in Subatomic Dynamics and Fundamental Interactions

The conventional definition of energy as the “capacity to do work” remains operationally effective but is conceptually insufficient as an ontological account in modern physics. It describes what energy does without specifying what energy is, and becomes strained in quantum, relativistic, and high-entropy regimes where energy cannot always be characterized through classical work. This paper proposes a structural revision: energy is the physical state of the arrangement and motion of subatomic excitations within their mediating fields, governed by the strong nuclear, weak nuclear, and electromagnetic interactions, and constrained by gravity. Within this framework, potential energy corresponds to configurational structure, while kinetic, thermal, and radiant energy correspond to dynamical motion. This unifies traditionally distinct categories under a single state-based ontology and aligns with quantum theory, where energy is derived from the state via the Hamiltonian, and with general relativity, where energy–momentum determines spacetime curvature through the stress–energy tensor. The framework also distinguishes energy associated with physically instantiated states from quantities associated primarily with spacetime geometry. Applied to the dark sector, this distinction places dark energy under diagnostic constraint: if it cannot be mapped to a structurally distinguishable state, it may reflect a geometric property of spacetime rather than energy in the conventional physical sense. Dark matter, by contrast, remains a candidate for undiscovered state-structured energy. By clarifying the domain of energy, this definition constrains interpretation without introducing new entities and establishes a direct connection between physical state and information, providing a foundation for Cosmic Intelligence Theory (CIT).