Dynamic Spacetime Fluid Cosmology

Abstract

Author's Note: Published on the 15th of August, 2026. As we celebrate India's Independence Day today, I present this updated framework with the hope that it serves as a meaningful, independent step forward in our shared exploration of the cosmos. This formal theoretical treatise introduces a novel cosmological framework that reconceptualizes spacetime not as a passive vacuum, but as a dynamic, energetic continuum termed the "spacetime fluid". Addressing the theoretical limits of current cosmological paradigms—such as the elusive nature of dark matter, dark energy, and the mathematical unification of fundamental forces—the model posits that this fluid originates from and is sustained by a continuous thermodynamic energy influx from a higher-dimensional manifold. Within this framework, mass is redefined as a stable, localized topological excitation (soliton) maintained by a volume-dependent absorption of the surrounding continuum's energy. This continuous energy absorption creates localized depressions in the fluid's structural resistance (viscosity). Consequently, these mass-induced viscosity gradients formally dictate spacetime curvature, where superposed gradient fields drive the macroscopic phenomenon of gravitational attraction. Building upon the foundational tensor architecture introduced in Version 2.0, Version 3.0 rigorously elevates this model into a parameter-free mathematical framework. By formalizing the macroscopic viscosity collapse as a Cooperative Condensate Phase Transition bounded strictly by the Planck Mass and the Cosmological Horizon, all arbitrary scaling divisors are eliminated. Furthermore, the integration of a dynamically emergent Baryonic Half-Mass Radius and a complementary Volumetric Strain Field into the Active Viscosity Tensor mathematically generates the sustained geometric tension required for flat galactic rotation curves. Validated against thousands of empirical data points, this treatise establishes a deterministic, purely derived first-principles foundation for relativistic phenomena without invoking dark matter or phenomenological tuning parameters.