  In the special theory of relativity, Lorentz invariance is extended in
Minkowski spacetime from ideal inertial observers to actual observers by means
of the hypothesis of locality, which postulates that accelerated observers are
always pointwise inertial. A critical examination of the locality assumption
reveals its domain of validity: it is true for pointwise coincidences, but is
in conflict with wave-particle duality. To remedy this situation, a nonlocal
theory of accelerated systems is presented that reduces to the standard theory
in the limit of small accelerations. Some of the main consequences of nonlocal
special relativity are briefly outlined.
