Dimension and ergodic decompositions for hyperbolic flows

Christian Wolf, Luís Barreira
2006 Discrete and Continuous Dynamical Systems. Series A  
For conformal hyperbolic flows, we establish explicit formulas for the Hausdorff dimension and for the pointwise dimension of an arbitrary invariant measure. We emphasize that these measures are not necessarily ergodic. The formula for the pointwise dimension is expressed in terms of the local entropy and of the Lyapunov exponents. We note that this formula was obtained before only in the special case of (ergodic) equilibrium measures, and these always possess a local product structure (which
more » ... structure (which is not the case for arbitrary invariant measures). The formula for the pointwise dimension allows us to show that the Hausdorff dimension of a (nonergodic) invariant measure is equal to the essential supremum of the Hausdorff dimension of the measures in an ergodic decomposition. 2000 Mathematics Subject Classification. Primary: 37C40.
doi:10.3934/dcds.2007.17.201 fatcat:ulpu7o7iancxdhwcsnpqekh2jy