Abstract
Renormalization group methods are used to describe systems which model critical phenomena at the onset of helical order. This onset is marked by a change in the “bare propagator” used in perturbation theory from a k2-dependence to a more general form. We consider systems which in the non-helical region exhibit O simultaneously critical phases. Results are given to first order in an ϵ-expansion. For the isotropic case of k2L dependence and O = 2, we give η to first order in 1/n for d- ⩽ d ⩽ d+ where d+- are upper and lower borderline dimensions.
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