Method of fixed relative distance

A Sylvester equation approach for the computation of zero-group-velocity points in waveguides
Eigenvalues of parameter-dependent quadratic eigenvalue problems form eigencurves. The critical points on these curves, where the …
Bor Plestenjak, Daniel A. Kiefer, Hauke Gravenkamp
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A Sylvester equation approach for the computation of zero-group-velocity points in waveguides