Long-range interaction of kinks in higher-order polynomial models

Abstract

We obtain asymptotic estimates of the interaction forces between kink and antikink in a family of field-theoretic models with two vacua in (1+1)-dimensional space–time. In our study we consider a new class of soliton solutions previously found in our paper (Chaos Solitons Fractals 2022;165:112805). We focus on the case of kinks having one exponential and one power-law asymptotics. We show that if the kink and antikink are faced each other with long-range tails, the force of attraction between them at large separations demonstrates a power-law decay with the distance. We also performed numerical simulations to measure the interaction force and obtained good agreement between the experimental values and theoretical estimates.