k-defects as compactons

Details k-defects as compactons k-defects as compactons

2007-05-24

arxiv.org/abs/0705.3554v4

J.Phys.A40:13625-13643,2007; Erratum-ibid.A42:089801,2009

Physics

High Energy Physics

High Energy Physics - Theory

the stability proof of Section 4.4 corrected, some references added

Scientific paper

10.1088/1751-8113/40/45/009 10.1

We argue that topological compactons (solitons with compact support) may be quite common objects if $k$-fields, i.e., fields with nonstandard kinetic term, are considered, by showing that even for models with well-behaved potentials the unusual kinetic part may lead to a power-like approach to the vacuum, which is a typical signal for the existence of compactons. The related approximate scaling symmetry as well as the existence of self-similar solutions are also discussed. As an example, we discuss domain walls in a potential Skyrme model with an additional quartic term, which is just the standard quadratic term to the power two. We show that in the critical case, when the quadratic term is neglected, we get the so-called quartic $\phi^4$ model, and the corresponding topological defect becomes a compacton. Similarly, the quartic sine-Gordon compacton is also derived. Finally, we establish the existence of topological half-compactons and study their properties.

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