The effectiveness of the local potential approximation in the Wegner-Houghton renormalization group
Ken-Ichi Aoki, Keiichi Morikawa, Wataru Souma, Jun-ichi Sumi, Haruhiko Terao
Abstract
The non-perturbative Wegner-Houghton renormalization group is analyzed by the local potential approximation in O(N) scalar theories in d-dimensions
(3≤d≤4)
. The leading critical exponents \nu are calculated in order to investigate the effectiveness of the local potential approximation by comparing them with the other non-perturbative methods. We show analytically that the local potential approximation gives the exact exponents up to
O(ϵ)
in \epsilon-expansion and the leading in 1/N-expansion. We claim that this approximation offers fairly accurate results in the whole range of the parameter space of N and d. It is a great advantage of our method that no diverging expansions appear in the procedure.