ABSTRACT
The mode-mode coupling, however, does depend on details
of the iynamics. The precession of spins in a ferrom agnet
is a very special feature, not shared by antiferromagnets,
for example. The exponent z = 1 + d/2 for the
496 S IM PL E DYNAMIC M O D ELS
ferromagnetic model is a consequence of the form of the
precession term in the kinetic equation. Our task is thus
to c lassify various features of mode-mode coupling terms
which are relevant in determining the transformation
properties under the RG.
