The Physical Vacuum as the "Immaterial Fluid" Medium: Fundamental Equations, Time Emergence, Light Speed Invariance, and Interference Invariance in the Michelson–Morley Experiment

In this article the theory of the physical vacuum understood as “Immaterial Fluid” (see Di Massa, Lupparelli, Ciarloni - Theoretical Model for the Physical Vacuum as a Superfluid Medium: Structure, Pair Production, Emergent Gravitation, Light Propagation, and Virtual Particle Creation-Annihilation Processes. https://doi.org/10.5281/zenodo.17762316) is further developed. The laws describing the behavior of the “immaterial” elementary particles constituting the fluid are derived. Since their structure has been defined, it has been possible to derive these laws using both contemporary mathematical formalism and classical mathematics. The ability to analyze the behavior of the Immaterial Fluid using the two approaches highlights and reinforces the internal consistency of the model. Furthermore, it has also been possible to physically describe the mechanism through which time emerges, and the speed of light remains constant. From this follows the explanation of why in the Michelson-Morley experiment, even if we consider the presence of the Immaterial Fluid, still no interference variation is observed. Through the Immaterial Fluid, many as-yet unresolved aspects of physics seem to find a clear interpretation (Di Massa, A., Lupparelli, S. - New Description of Quarks, Gluons, the Strong Interaction, β⁻ Decay, the W⁻ Weak Boson, and the Three Generations of Charged Leptons and Quarks. 2026. zenodo https://doi.org/10.5281/zenodo.21130661). For other topics - such as dark energy, dark matter, entanglement, wave-particle dualism - possible, clear interpretations have been identified, but they still need to be explored in depth. lupparelli.sergio@gmail.com