Hyperbolic continuation of high-entropy homoclinic classes

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Let ff be a CrC^r diffeomorphism of a compact surface. For 0<t≤htop(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 fn→ff_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 μO∈C\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.

References

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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