3 research outputs found
Spontaneous PT-Symmetry Breaking for Systems of Noncommutative Euclidean Lie Algebraic Type
We propose a noncommutative version of the Euclidean Lie algebra E 2. Several types of non-Hermitian Hamiltonian systems expressed in terms of generic combinations of the generators of this algebra are investigated. Using the breakdown of the explicitly constructed Dyson maps as a criterium, we identify the domains in the parameter space in which the Hamiltonians have real energy spectra and determine the exceptional points signifying the crossover into the different types of spontaneously broken PT-symmetric regions with pairs of complex conjugate eigenvalues. We find exceptional points which remain invariant under the deformation as well as exceptional points becoming dependent on the deformation parameter of the algebra
Type-II B\"acklund Transformations via Gauge Transformations
The construction of type II Backlund transformation for the sine-Gordon and
the Tzitzeica-Bullough-Dodd models are obtained from gauge transformation. An
infinite number of conserved quantities are constructed from the defect
matrices. This guarantees that the introduction of type II defects for these
models does not spoil their integrability. In particular, modified energy and
momentum are derived and compared with those presented in recent literature.Comment: Latex 19 pages, 2 tables. v2: Comments and two references adde