Special Relativity

The special-relativity category develops the flat spacetime framework from explicit postulates and mathematical definitions: the affine Minkowski model, inertial frames and charts, worldlines and clocks, observer measurements, Lorentz transformations and their tensor calculus, energy and momentum, forces and the continuum, causality and signals, light and the Doppler effect, accelerated observers, the Newtonian bridge and the experimental interface. Physical postulates are adopted assumptions; the mathematical results in this category are complete conditional deductions from them. The continuum pages build the stress-energy field, its observer decomposition and the scalar-field, dust and perfect-fluid models, with local conservation derived from the adopted model equations and integrated conservation only under an explicit isolation premise on finite boxes. No empirical claim, measurement, gravity or electromagnetic coupling is asserted unless a page says so explicitly.