**After 100 Years of General Relativity Theory its Time for Super Principle Relativity Theory**

**Abstract**

The Super Principle Relativity Theory is a hydrodynamic field theory, which models “Gravitation” and the “Vacuum”, in the conceptual and mathematical framework of a variable density *compressible ideal gaseous fluid*. In contrast to General Relativity Theory which is a field theory, that models “Gravitation” and the “Vacuum”, in the conceptual and mathematical framework of a fixed density *“frictionless incompressible fluid medium” or “incompressible liquid medium”*. The new theory produces exact solutions to gravitation phenomena, and describes the Euler-Lagrangian Hydrodynamic Energy Density Equation, as a space-time frame of reference; and is mathematically the net sum of space-like and time-like energy density terms. The “Hydrodynamic Field Energy Density Frame of Reference” is used to model the interaction between seven (7) physical phenomena: gravitational, electromagnetic, isotropic space-time world line, gravitational sink, gravitational source, electromagnetic sink, and electromagnetic source energy density frames of reference. The “Hydrodynamic Field Theory” models physical phenomena: solar systems, galaxy rotation, quantum mechanical systems, etc.

**Keywords:** General Relativity, Euler-Lagrangian Field Theory, Classical Field Theory, Einstein Field Equation, Gravitational Field, Vacuum Energy Density, Black Hole, Hydrodynamic, Gravitation