Abstract
We use the linear delta expansion with a trial action based on single links to explore the phase structure of the mixedSU(2)-SO(3) lattice gauge theory. The method can be regarded as a systematic expansion going beyond mean field theory or the variational method, to which it is closely related in first order. AtO(δ2) the line of first-order phase transitions is shown to terminate, and atO(δ3) the boundaries between the different phases are well reproduced.
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