Identifying rare chaotic and regular trajectories in dynamical systems with Lyapunov weighted path sampling

Autor(en)

Philipp Geiger, Christoph Dellago

Abstrakt

Depending on initial conditions, individual finite time trajectories of dynamical systems can have very different chaotic properties. Here we present a numerical method to identify trajectories with atypical chaoticity, pathways that are either more regular or more chaotic than average. The method is based on the definition of an ensemble of trajectories weighted according to their chaoticity, the Lyapunov weighted path ensemble. This ensemble of trajectories is sampled using algorithms borrowed from transition path sampling, a method originally developed to study rare transitions between long-lived states. We demonstrate our approach by applying it to several systems with numbers of degrees of freedom ranging from one to several hundred and in all cases the algorithm found rare pathways with atypical chaoticity. For a double well dimer embedded in a solvent, which can be viewed as simple model for an isomerizing molecule, rare reactive pathways were found for parameters strongly favoring chaotic dynamics.

Organisation(en)

Computergestützte Materialphysik, Computergestützte Physik und Physik der Weichen Materie

Journal

Chemical Physics

Band

375

Seiten

309-315

Anzahl der Seiten

7

ISSN

0301-0104

DOI

https://doi.org/10.1016/j.chemphys.2010.04.024

Publikationsdatum

2010

Peer-reviewed

Ja

ÖFOS 2012

103018 Materialphysik

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/04e3a526-c4b1-41f8-9762-aba673f48400