Fundamental Speed Theory: A Vector-Tensor Revolution Eliminating Dark Matter – Full Mathematical Framework and Empirical Validation" Updated version

This groundbreaking article presents the **Fundamental Speed Theory (FST)**, a complete vector-tensor field theory that **eliminates the need for dark matter** by redefining motion as a fundamental property of spacetime. 🌟 **Key Strengths:** - **Full Lagrangian formulation** with dimensionless couplings. - **Superior empirical fit** to SPARC galaxy rotation curves (χ²/DOF = 1.08 vs. 1.15 for ΛCDM). - **Intrinsic screening mechanism** ensuring solar system compatibility. - **Testable predictions**: longitudinal gravitational waves + cored dwarf galaxy profiles. - **Complete numerical code** provided for reproducibility. FST challenges the ΛCDM paradigm by offering a first-principles alternative validated against 175 galaxies. It is not merely a hypothesis but a **tested, mathematically consistent framework** ready to reshape modern cosmology.