Systematic coarse-graining that maps effective couplings at scale ℓ to those at ℓ'. Explains universality of critical exponents; indispensable in QFT and condensed matter.
Systematic coarse-graining that maps effective couplings at scale ℓ to those at ℓ'. Explains universality of critical exponents; indispensable in QFT and condensed matter.