Periodic Eigendecomposition and its application in nonlinear dynamics

SIAM Student Seminar
Friday, October 17, 2014 - 2:00pm for 1 hour (actually 50 minutes)
Skiles 269
Xiong Ding – School of Physics, Georgia Tech
Fabio Difonzo
Periodic eigendecomposition algorithm for calculating eigenvectors of a periodic product of a sequence of matrices, an extension of the periodic Schur decomposition, is formulated and compared with the recently proposed covariant vectors algorithms. In contrast to those, periodic eigendecomposition requires no power iteration and is capable of determining not only the real eigenvectors, but also the complex eigenvector pairs. Its effectiveness, and in particular its ability to resolve eigenvalues whose magnitude differs by hundreds of orders, is demonstrated by applying the algorithm to computation of the full linear stability spectrum of periodic solutions of Kuramoto-Sivashinsky system.