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Quantitative statistical stability and linear response for irrational rotations and diffeomorphisms of the circle

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  • We prove quantitative statistical stability results for a large class of small $ C^{0} $ perturbations of circle diffeomorphisms with irrational rotation numbers. We show that if the rotation number is Diophantine the invariant measure varies in a Hölder way under perturbation of the map and the Hölder exponent depends on the Diophantine type of the rotation number. The set of admissible perturbations includes the ones coming from spatial discretization and hence numerical truncation. We also show linear response for smooth perturbations that preserve the rotation number, as well as for more general ones. This is done by means of classical tools from KAM theory, while the quantitative stability results are obtained by transfer operator techniques applied to suitable spaces of measures with a weak topology.

    Mathematics Subject Classification: Primary: 37C40; Secondary: 37A30, 37J40, 37A45, 37C05, 37C75, 37E45.

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