Relativistic Invariance

(or Lorentz invariance), the invariance of natural laws under the Lorentz transformations that follow from the theory of relativity. Relativistic invariance expresses the equivalence of all inertial frames of reference; that is, by virtue of relativistic invariance, the equations describing any physical processes have an identical form in all such systems. Relativistic invariance sets certain limits to the possible relationships between physical quantities and therefore plays a fundamental role in the search for new physical relationships.