Physics – Mathematical Physics
Scientific paper
2005-06-09
Czech.J.Phys. 55 (2005) 1099-1106
Physics
Mathematical Physics
8 pages, 3 figures, Conf. Proc., 3rd International Workshop "Pseudo-Hermitian Hamiltonians in Quantum Physics", Istanbul, Turk
Scientific paper
10.1007/s10582-005-0113-z
The spectra of self-adjoint operators in Krein spaces are known to possess real sectors as well as sectors of pair-wise complex conjugate eigenvalues. Transitions from one spectral sector to the other are a rather generic feature and they usually occur at exceptional points of square root branching type. For certain parameter configurations two or more such exceptional points may happen to coalesce and to form a higher order branch point. We study the coalescence of two square root branch points semi-analytically for a PT-symmetric 4x4 matrix toy model and illustrate numerically its occurrence in the spectrum of the 2x2 operator matrix of the magnetohydrodynamic alpha^2-dynamo and of an extended version of the hydrodynamic Squire equation.
Guenther Uwe
Stefani Frank
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