scale symmetry

scale symmetry

[′skāl ‚sim·ə·trē]
(physics)
The property of certain physical systems whereby their equations of motion in classical mechanics are unchanged when the space and time variables are rescaled; for example, for a point particle moving in a plane in a potential given by a delta function at the origin, when the vector giving the particle's position r is replaced by sr and the time t is replaced by s 2 t, where s is any number.
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