Sharpness of the entropy threshold for infinitely many ergodic measures of maximal entropy
Sharpness of the entropy threshold for infinitely many ergodic measures of maximal entropy
Let be a diffeomorphism of a closed surface, where , and let denote the minimum expansion rate appearing in the entropy estimates. A measure maximizing entropy is a measure with ; it is ergodic when it is ergodic for . Sharpness conjecture. For any and any , there is a surface diffeomorphism with
and infinitely many ergodic measures maximizing entropy. This would show that the threshold in the finiteness theorem is sharp; the conjecture remains open.
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Primary source
Jérôme Buzzi, Sylvain Crovisier and Omri Sarig, “Measures of maximal entropy for surface diffeomorphisms”, arXiv:1811.02240 (2019).
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