Hyperbolic continuation of high-entropy homoclinic classes

Let ff be a CrC^r diffeomorphism of a compact surface. For 0<thtop(f)0<t\le h_{\rm top}(f), let H(f,t)\mathcal H(f,t) be the set of homoclinic classes of measures CC satisfying h(f,C)th(f,C)\ge t. Let fnff_n\to f converge in the CrC^r topology. For a homoclinic class CC of ff, its hyperbolic continuation under a nearby diffeomorphism gg is the homoclinic class CgC_g containing all ergodic hyperbolic measures of gg homoclinically related to the hyperbolic continuation of a periodic orbit OO with μOC\mu_O\in C. Continuation conjecture. Fix t>λmin(f)/rt>\lambda_{\min}(f)/r. If #H(fn,t)=#H(f,t)\#\mathcal H(f_n,t)=\#\mathcal H(f,t) for all large nn, then, for all large nn, each homoclinic class in H(fn,t)\mathcal H(f_n,t) is the hyperbolic continuation of some homoclinic class in H(f,t)\mathcal H(f,t). This conjecture refines upper semicontinuity by asserting that equality of the numbers of high-entropy classes forces every perturbed class to arise by continuation from an original one.

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Primary source

Jérôme Buzzi, Chiyi Luo and Dawei Yang, “Continuity properties of ergodic measures of maximal entropy for C^r surface diffeomorphisms”, arXiv:2412.19658 (2025).

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