Perturbations of the signum-Gordon model

Details Perturbations of the signum-Gordon model Perturbations of the signum-Gordon model

2007-11-13

arxiv.org/abs/0711.2081v2

J. Phys. A: Math. Theor. 41 (2008) 095403

Physics

High Energy Physics

High Energy Physics - Theory

22 pages, 8 figures

Scientific paper

10.1088/1751-8113/41/9/095403

We investigate a perturbation of a scalar field model (called here the signum-Gordon model) with the potential $V(f)=|f|$. The perturbation generalizes the signum-Gordon model to the signum-Klein-Gordon model i.e. to the case $V(f)=|f|-{1/2}\lambda f^2$, where $\lambda$ is a small parameter. Such a generalization breaks the scaling symmetry of the signum-Gordon model. In this paper we concentrate on solutions for self-similar initial data. Such data are particulary useful for identification of the effects caused by the term that breaks the scaling symmetry. We have found that the behaviour of the solutions is quite interesting - they escape and return periodically to the self-similar initial data.

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