05-392 Steve Clark and Fritz Gesztesy
On Self-adjoint and J-self-adjoint Dirac-type Operators: A Case Study (135K, LaTeX) Nov 15, 05
Abstract , Paper (src), View paper (auto. generated ps), Index of related papers

Abstract. We provide a comparative treatment of some aspects of spectral theory for self-adjoint and non-self-adjoint (but J-self-adjoint) Dirac-type operators connected with the defocusing and focusing nonlinear Schr\"odinger equation, of relevance to nonlinear optics. In addition to a study of Dirac and Hamiltonian systems, we also introduce the concept of Weyl-Titchmarsh half-line m-coefficients (and 2 x 2 matrix-valued M-matrices) in the non-self-adjoint context and derive some of their basic properties. We conclude with an illustrative example showing that crossing spectral arcs in the non-self-adjoint context imply the blowup of the norm of spectral projections in the limit where the crossing point is approached.

Files: 05-392.tex