The Isotropy of the Speed of Light and its Implications

This monograph reexamines the basics on the motional properties of light and of material particles in an attempt to resolve as many of the questions and paradoxes posed by the different interpretational scenarios of Special Relativity (SR). The observational process is clarified and defined in terms of measurements by the use of standard rulers. Motion invariant rulers vs. motion variant rulers are considered under different interpretational scenarios of SR. The isotropy of the speed of light and particle trajectories in general are then considered under the different interpretational scenarios of SR to clarify their implications together with the behavior of de Broglie matter-waves, in reference to their motional geometry. In conclusion, a 3D spherical manifold (S3 hypersurface) is proposed for the motional geometry of the Universe.