Anisotropic renormalization group
= Anisotropic renormalization group
A <renormalization-group transformation> can scale different coordinate directions by different factors to keep distinct gradient terms fixed. If momentum component $p_i$ scales to $b^{w_i}p_i$, its coordinate scales by $b^{-w_i}$. The momentum/volume measure has total scaling weight $\sum_iw_i$, motivating the <anisotropic effective dimension>.