Abstract
The static kink, sphaleron and kink chain solutions for a single scalar field φ in one spatial dimension are reconsidered. By integration of the Euler–Lagrange equation, or through the Bogomolny argument, one finds that each of these solutions obeys a first-order field equation, an autonomous ODE that can always be formally integrated. We distinguish the BPS case, where the required integral is along a contour in the φ-plane, from the semi-BPS case, where the integral is along a contour in the Riemann surface double-covering the φ-plane, and is generally more complicated.
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