I. Nandori, I. G. Marian, V. Bacso
The need for the absence of spontaneous symmetry breaking in d=1 dimension has been used to optimize the regulator-dependence of functional renormalization group equations in the framework of the sine-Gordon scalar field theory. Known results on the power-law regulator have been recovered. The renormalization group equations with compactly supported smooth (CSS) regulator have been optimized which has importance since all major type of regulators are recovered by the CSS one in appropriate limits. Optimization of this kind can also be used to study the convergence of the derivative expansion.
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http://arxiv.org/abs/1303.4508
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