We consider the problem of determining the beta-functions for any reduced effective field theory. Even though not all the Green’s functions of a reduced effective field theory are renormalizable, unlike the full effective field theory, certain effective beta-functions for the reduced set of couplings may be calculated without having to introduce vertices in the Feynman rules for redundant opera...

We discuss shallow resonances in the nonrelativistic scattering of two particles using an effective field theory (EFT) that includes auxiliary with quantum numbers resonance. construct manifestly renormalized amplitude up to next-to-leading order a systematic expansion. For narrow resonance, is perturbative except immediate vicinity resonance poles. It naturally has zero low-energy region, anal...

in this paper we investigate the effect of a random transverse field, distributed according to a trimodal distribution, on the phase diagram and magnetic properties of a two-dimensional lattice (square with z=4),  ferromagnetic ising system consisting of magnetic atoms with spin-1. this study is done using the effectivefield theory (eft) with correlations method. the equations are derived using...