Absolutely Continuous Invariant Measures of Piecewise Linear Lorenz Maps

Abstract

Consider piecewise linear Lorenz maps on $[0,1]$ of the following form \[ f_{a,b,c}(x)= {ll} ax+1-ac & x \in [0, c) b(x-c) & x \in (c, 1].\] We prove that $f_{a,b,c}$ admits an absolutely continuous invariant probability measure (acim) $\mu$ with respect to the Lebesgue measure if and only if $f_{a,b,c}(0)\le f_{a,b,c}(1)$, i.e. $ac+(1-c)b\ge 1$. The acim is unique and ergodic unless $f_{a,b,c}$ is conjugate to a rational rotation. The equivalence between the acim and the Lebesgue measure is also fully investigated via the renormalization theory.

References in corpus (2)

• Renormalization and conjugacy of piecewise linear Lorenz maps
• Renormalization and alpha-limit set for expanding Lorenz maps