to the action S, where R k is a function of both k and p such that for p ≫ ≫ k , R k (p) is very tiny and approaches 0 and for p ≪ ≪ k , R k ( p ) ≳ ≳ k 2 . R k is both smooth and nonnegative. Its large value for small momenta leads to a suppression of their contribution to the partition function which is effectively the same thing as neglecting large-scale fluctuations.