Nonuniformly hyperbolic systems arising from coupling of chaotic and gradient-like systems

Matteo Tanzi, Lai Sang Young

Research output: Contribution to journalArticlepeer-review


We investigate dynamical systems obtained by coupling two maps, one of which is chaotic and is exemplified by an Anosov diffeomorphism, and the other is of gradient type and is exemplified by a N-pole-to-S-pole map of the circle. Leveraging techniques from the geometric and ergodic theories of hyperbolic systems, we analyze three different ways of coupling together the two maps above. For weak coupling, we offer an addendum to existing theory showing that almost always the attractor has fractal-like geometry when it is not normally hyperbolic. Our main results are for stronger couplings in which the action of the Anosov di eomorphism on the circle map has certain monotonicity properties. Under these conditions, we show that the coupled systems have invariant cones and possess SRB measures even though there are genuine obstructions to uniform hyperbolicity.

Original languageEnglish (US)
Pages (from-to)6015-6041
Number of pages27
JournalDiscrete and Continuous Dynamical Systems- Series A
Issue number10
StatePublished - Oct 2020


  • Coupled dynamical systems
  • Nonuniformly hyperbolic systems
  • SRB measures

ASJC Scopus subject areas

  • Analysis
  • Discrete Mathematics and Combinatorics
  • Applied Mathematics


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