We compute the effective potential for theory with a squeezed coherent-state type of construct for the ground state. The method essentially consists of optimizing the basis at zero and finite temperatures. The gap equation becomes identical to resumming the infinite series of daisy and superdaisy graphs while the effective potential includes multiloop effects and agrees with that obtained through the composite operator formalism at finite temperature.
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Mishra et al. (1997) studied this question.
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