Special Relativity and Inertial Mass

Einstein postulated that the speed of light is constant and derived the consequences — time dilation, length contraction, and Lorentz invariance. This is mathematically correct but ontologically backwards. The constancy of c is not the fundamental insight.

This paper demonstrates that relativistic effects are inevitable in any system with finite causation speed — not just light, not just electromagnetic fields, not just in vacuum. Consider pendula on an elastic rope: the rope has finite tension, so disturbances propagate at finite speed. The system obeys sine-Gordon wave equations. Move a pendulum along the rope, and it experiences effective "time dilation" and "length contraction" relative to stationary pendula — purely from finite propagation geometry.

When any structure held together by finite-speed interactions moves relative to the propagation medium, it must physically contract and its internal dynamics must slow down. The "constant c" is a measurement artefact: moving rulers shrink, moving clocks slow, and these distortions cancel perfectly when measuring the propagation speed.

Special Relativity is not mysterious or unique to light. It is the generic consequence of finite causation in any system. The Lorentz transformations are geometric necessities, not postulates. Relativity is universal.

This paper addresses the wave sector — how structures bound by finite-speed interactions behave when moving. OFT 4–5 apply these principles to the monopolon sector (matter as topological solitons).