Liao Standard Systems and Nonzero Lyapunov Exponents for Differential Flows

Details Liao Standard Systems and Nonzero Lyapunov Exponents for Differential Flows Liao Standard Systems and Nonzero Lyapunov Exponents for Differential Flows

2004-08-23

arxiv.org/abs/math/0408307v1

Mathematics

Dynamical Systems

23 pages

Scientific paper

Consider a $C^1$ vector field together with an ergodic invariant probability that has $\ell$ nonzero Lyapunov exponents. Using orthonormal moving frames along certain transitive orbits we construct a linear system of $\ell$ differential equations which is a reduced form of Liao's "standard system". We show that the Lyapunov exponents of this linear system coincide with all the nonzero exponents of the given vector field with respect to the given probability. Moreover, we prove that these Lyapunov exponents have a persistence property that implies that a "Liao perturbation" preserves both sign and value of nonzero Lyapunov exponents.

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