Iterated ${\varphi }^4$ Kinks

Abstract

A first order equation for a static ${\varphi }^4$ kink in the presence of an impurity is extended into an iterative scheme. At the first iteration, the solution is the standard kink, but at the second iteration the kink impurity generates a kink-antikink solution or a bump solution, depending on a constant of integration. The third iterate can be a kink-antikink-kink solution or a single kink modified by a variant of the kink's shape mode. All equations are first order ODEs, so the nth iterate has n moduli, and it is proposed that the moduli space could be used to model the dynamics of n kinks and antikinks. Curiously, fixed points of the iteration are ${\varphi }^6$ kinks.

arXiv commentVersion accepted for publication in JHEP

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• Supersymmetric Inhomogeneous Field Theories in 1+1 Dimensions
• Collisions between kinks with long-range tails: a simple and efficient method
• Kink scattering in the presence of geometric constrictions
• Background fields and self-dual Skyrmions
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• Novel way to construct spatially localized finite energy structures