Noun
English Wikipedia has an article on:renormalizationWikipedia
renormalization (countable and uncountable, plural renormalizations)
(physics) Any of several techniques in statistical mechanics and quantum electrodynamics used to construct mathematical relationships between observable quantities.
After renormalization, calculations using Feynman diagrams match experimental results with very high accuracy. Source: Internet
Diverse systems with the same critical exponents—that is, which display identical scaling behaviour as they approach criticality —can be shown, via renormalization group theory, to share the same fundamental dynamics. Source: Internet
Even though renormalization works very well in practice, Feynman was never entirely comfortable with its mathematical validity, even referring to renormalization as a "shell game" and "hocus pocus". Source: Internet
He said in that paper that Feynman diagrams were not just a computational tool, but a physical theory, and developed rules for the diagrams that completely solved the renormalization problem. Source: Internet
However, since s is an unphysical parameter, physical states must be left invariant by "s-evolution", and so the physical state space is the kernel of (this requires the use of a rigged Hilbert space and a renormalization of the norm). Source: Internet
In this situation, the predictions of effective field theory are thought to be invalid, as renormalization should cause large corrections that could prevent inflation. Source: Internet