Spontaneous symmetry breaking in the non-linear Schrodinger hierarchy with defect

Details Spontaneous symmetry breaking in the non-linear Schrodinger hierarchy with defect Spontaneous symmetry breaking in the non-linear Schrodinger hierarchy with defect

2004-11-04

arxiv.org/abs/math-ph/0411022v2

J.Phys. A38 (2005) 2241-2258

Physics

Mathematical Physics

discussion on symmetry breaking has been improved and examples added

Scientific paper

10.1088/0305-4470/38/10/013

We introduce and solve the one-dimensional quantum non-linear Schrodinger (NLS) equation for an N-component field defined on the real line with a defect sitting at the origin. The quantum solution is constructed using the quantum inverse scattering method based on the concept of Reflection-Transmission (RT) algebras recently introduced. The symmetry of the model is generated by the reflection and transmission defect generators defining a defect subalgebra. We classify all the corresponding reflection and transmission matrices. This provides the possible boundary conditions obeyed by the canonical field and we compute these boundary conditions explicitly. Finally, we exhibit a phenomenon of spontaneous symmetry breaking induced by the defect and identify the unbroken generators as well as the exact remaining symmetry.

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