Knots from wall--anti-wall annihilations with stretched strings

Abstract

A pair of a domain wall and an anti-domain wall is unstable to decay. We show that when a vortex-string is stretched between the walls, there remains a knot soliton (Hopfion) after the pair annihilation.

Comments: 10 pages, 6 figures, published version. arXiv admin note: text overlap with arXiv:1205.2442