In physics, dimensional reduction refers to the description of a system in D spacetime dimensions in terms of an exact or effective action in fewer than D dimensions. == In field theory == In statistical or quantum field theory, dimensional reduction is the limit of a compactified theory where the size of the compact dimension(s) goes to zero.
In physics, dimensional reduction refers to the description of a system in D spacetime dimensions in terms of an exact or effective action in fewer than D dimensions. == In field theory == In statistical or quantum field theory, dimensional reduction is the limit of a compactified theory where the size of the compact dimension(s) goes to zero.
Source: Wikipedia "Dimensional reduction" · CC BY-SA 4.0
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