running coupling

Fetched 2026-10-26 (cache).

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Noun

1. {{lb|en|physics}} A coupling whose strength measurement appears to deviate from its true value as the energy scale at which it is probed shrinks, the deviation being a consequence of higher-order interaction terms and associated [[renormalization]] issues becoming relevant; metaphorically, a coupling whose strength "runs" from its limiting macroscopic value.

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