Coleman-Weinberg potential

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The Coleman-Weinberg model represents quantum electrodynamics of a scalar field in four-dimensions. The Lagrangian for the model is

$L = -\frac{1}{4} (F_{\mu \nu})^2 + (D_{\mu} \phi)^2 - m^2 \phi^2 - \frac{\lambda}{6} \phi^4$