Lyapunov modes in soft-disk fluids

Autor(en)

Christina Forster, Harald Posch

Abstrakt

Lyapunov modes are periodic spatial perturbations of phase-space states of many-particle systems, which are associated with the small positive or negative Lyapunov exponents. Although familiar for hard-particle systems in one, two and three dimensions, they have been difficult to find for soft particles. We present computer simulations for soft-disk systems in two dimensions and demonstrate the existence of the modes, where also Fourier-transformation methods are employed. We discuss some of their properties in comparison with equivalent hard-disk results. The whole range of densities corresponding to fluids is considered. We show that it is not possible to represent the modes by a two-dimensional vector field of the position perturbations alone (as is the case for hard disks), but the momentum perturbations are simultaneously required for their characterization. ΠIOP Publishing Ltd and Deutsche Physikalische Gesellschaft.

Organisation(en)

Computergestützte Physik und Physik der Weichen Materie

Journal

New Journal of Physics

Band

7

Anzahl der Seiten

20

ISSN

1367-2630

DOI

https://doi.org/10.1088/1367-2630/7/1/032

Publikationsdatum

2005

Peer-reviewed

Ja

ÖFOS 2012

1030 Physik, Astronomie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/d3adc94c-9a53-42c6-b897-04c7c69ffba4