For , these coordinates cover a wedge of Minkowski spacetime and give in two dimensions. A constant- observer has proper acceleration and the Unruh effect temperature in natural units. The apparent degeneration at is a coordinate horizon.
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Rindler coordinates are a specific set of coordinates used in the context of special relativity and general relativity to describe the perspective of an observer undergoing constant proper acceleration. They are particularly useful for analyzing scenarios involving accelerated frames of reference. In Minkowski space (the spacetime of special relativity), Rindler coordinates are derived from the usual Cartesian coordinates by performing a change of coordinates that reflects the experience of an observer who is accelerating with respect to an inertial observer.