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Verified Computation of High-Order Poincaré Maps
Abstract
Poincare maps often prove to be invaluable tools in the study of long-term behaviour and qualitative properties of a given dynamical system. While the analytic theory of these maps is fully explored, finding numerical algorithms that allow the computation of Poincare maps in concrete problems is far from trivial. For the verification it is desirable to approximate the Poincare map over as large a domain as possible. Knowledge of the flow of the system is a prerequisite for any computation of Poincare maps. Taylor model based verified integrators compute final coordinates as high-order polynomials in terms of initial coordinates, with a small remainder error interval which typically is many orders of magnitude smaller than the initial domain.We present a method to obtain a Taylor model representation of the Poincare map from the original Taylor model flow representation. First a high-order polynomial approximation of the time necessary to reach the Poincare section is determined as a function of the initial conditions. This is achieved by reducing the problem to a non-verified polynomial inversion. This approximate crossing time is inserted into the Taylor model of the time-dependent flow, leading to an approximate Poincare map. A verified correction is performed heuristically which provides a rigorous enclosure of the Poincare map given, demonstrating achieved accuracy with verification.
J. Grote, K. Makino, M. Berz, Transactions on Systems 11,4 (2005) 1986-1992
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