Some aspects of jump-defects in the quantum sine-Gordon model

Bowcock, P.; Corrigan, E.; Zambon, C.

Abstract

The classical sine-Gordon model permits integrable discontinuities, or jump-defects, where the conditions relating the fields on either side of a defect are Bäcklund transformations frozen at the defect location. The purpose of this article is to explore the extent to which this idea may be extended to the quantum sine-Gordon model and how the striking features of the classical model may translate to the quantum version. Assuming a positive defect parameter there are two types of defect. One type, carrying even charge, is stable, but the other type, carrying odd charge, is unstable and may be considered as a resonant bound state of a soliton and a stable defect. The scattering of solitons with defects is considered in detail, as is the scattering of breathers, and in all cases the jump-defect is purely transmitting. One surprising discovery concerns the lightest breather. Its transmission factor is independent of the bulk coupling — a property susceptible to a perturbative check, but not shared with any of the other breathers. It is argued that classical jump-defects can move and some comments are made concerning their quantum scattering matrix.

Citation

Bowcock, P., Corrigan, E., & Zambon, C. (2005). Some aspects of jump-defects in the quantum sine-Gordon model. Journal of High Energy Physics, 2005(08), Article 023. https://doi.org/10.1088/1126-6708/2005/08/023

• Journal Article Type: Article
• Publication Date: Aug 3, 2005
• Deposit Date: Apr 24, 2007
• Publicly Available Date: Jun 17, 2015
• Journal: Journal of High Energy Physics
• Print ISSN: 1126-6708
• Electronic ISSN: 1029-8479
• Publisher: Scuola Internazionale Superiore di Studi Avanzati (SISSA)
• Peer Reviewed: Peer Reviewed
• Volume: 2005
• Issue: 08
• Article Number: 023
• DOI: https://doi.org/10.1088/1126-6708/2005/08/023
• Keywords: Solitons Monopoles, Instantons, Field theories in lower dimensions, Integrable field theories, Exact s-matrix.
• Public URL: https://durham-repository.worktribe.com/output/1563754
• Publisher URL: http://www.iop.org/EJ/abstract/1126-6708/2005/08/023/