Reconstruction of Strong-Gravity Astrophysics, Gravitational Waves, and Cosmology in Nakaza’s New Relativity Theory (NNRT)

Nakaza’s New Relativity Theory (NNRT) is not an auxiliary interpretive scheme that merely changes the interpretation of the equations of conventional relativity while leaving their foundations intact. NNRT reverses the very basis on which relativity is constructed. It places universal time and universal three-dimensional space at the foundation of physical reality and assigns real inertial motion to the Galilean transformation (GT). By contrast, the Lorentz transformation (LT) and general-relativistic metric structures are positioned as observational mappings formed through the phase, frequency, wave number, clocks, distances, and related electromagnetic observables. Under this reversal, relativistic effects that have conventionally been understood as the deformation or curvature of real spacetime acquire a different physical meaning: they are phenomena observed through the transport of　electromagnetic and matter-wave phases, generated from real-source dynamics through gravitational response. In this paper, this principle is applied consistently to strong-gravity objects, neutron-star compactness and tidal disruption, gravitational waves, black-hole shadows, observational horizons, cosmological redshift, the cosmic microwave background (CMB), baryon acoustic oscillations (BAO), and luminosity distance. The central structure is a mapping in which the real state generates the observational propagation structure 𝐶𝜇𝜈, through which the phase four-wavevector 𝐾𝜇 and the ray-bundle Jacobian 𝐷𝐵𝐴 are transported, ultimately producing observables such as 𝑧, 𝛥𝛩, 𝐷𝐴, 𝐷𝐿, and 𝐼𝜈. NNRT does not retain the conventional theory as a parallel framework. It relocates relativistic mathematics to the observational layer and restores universal spacetime, GT, and real matter dynamics to the foundation. This foundational reversal changes the formulation of problems from strong gravity to cosmology and reconstructs the physical meaning of relativity as a whole. More specifically, NNRT replaces the black-hole horizon as a boundary of real spacetime with an output of phase connectivity; replaces the singularity as an endpoint of spacetime with a stability problem of real matter; replaces gravitational waves as distortions of real space with dynamical gravity-phase coupling; replaces cosmic expansion as the stretching of real space with the real motion of the matter distribution plus observational mapping; and separates observational acceleration from acceleration of real space. In this way, NNRT absorbs the empirically successful mathematics of conventional relativity into the observational layer while leaving none of its ontological foundation intact, thereby reconstructing both the physical meaning of relativity and the research questions built upon it.