In theories with spontaneous symmetry breaking, the conventional effective potential possesses a defective loop expansion. For such theories, the exact effective potential V(φc,T) is real and convex, but its perturbative series is complex and concave at small φc and T. A more effective potential is available.
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Research Article| February 05 1992
Kevin Cahill; A more effective potential. AIP Conf. Proc. 5 February 1992; 272 (2): 1461–1465. https://doi.org/10.1063/1.43443
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