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running coupling
From Wiktionary, the free dictionary
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English
Noun
running coupling (plural running couplings)
- (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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