292 citations · 1k across the 13 of their papers we have counts for
13 papers
Linearized Perturbations of a Black Hole: Continuum Spectrum
P. T. Leung, Alec Maassen_van_den_Brink, K. W. Mak +1
Linearized perturbations of a Schwarzschild black hole are described, for each angular momentum , by the well-studied discrete quasinormal modes (QNMs), and in addition a con…
Unconventional Gravitational Excitation of a Schwarzschild Black Hole
P. T. Leung, Alec Maassen van den Brink, K. W. Mak +1
Besides the well-known quasinormal modes, the gravitational spectrum of a Schwarzschild black hole also has a continuum part on the negative imaginary frequency axis. The latter is…
SUSY Transformations for Quasinormal Modes of Open Systems
P. T. Leung, Alec Maassen van den Brink, W. M. Suen +2
Supersymmetry (SUSY) in quantum mechanics is extended from square-integrable states to those satisfying the outgoing-wave boundary condition, in a Klein-Gordon formulation. This bo…
SUSY Transformations for Quasinormal and Total-Transmission Modes of Open Systems
P. T. Leung, Alec Maassen van den Brink, W. M. Suen +2
Quasinormal modes are the counterparts in open systems of normal modes in conservative systems; defined by outgoing-wave boundary conditions, they have complex eigenvalues. The con…
Waves in Open Systems: Eigenfunction Expansions
E. S. C. Ching, P. T. Leung, W. M. Suen +2
An open system is not conservative because energy can escape to the outside. An open system by itself is thus not conservative. As a result, the time-evolution operator is not herm…
Waves in Open Systems via Bi-orthogonal Basis
P. T. Leung, W. -M. Suen, C. P. Sun +1
Dissipative quantum systems are sometimes phenomenologically described in terms of a non-hermitian hamiltonian , with different left and right eigenvectors forming a bi-orthogon…