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PreprintCC BY 4.0arXiv

Persistence of invariant graphs for twist maps under analytic perturbations

Abstract

We construct high-frequency perturbations of an integrable exact symplectic twist map which preserve an analytic invariant graph with a prescribed rotation number. Their oscillation frequencies may be any positive integers tending to infinity. For every fixed Gevrey parameter L>0, the perturbations tend to zero in a Gevrey-α norm and diverge in a Gevrey-(α−ε) norm. The frequency class strictly contains the α-Brjuno--Rüssmann class, and their difference has cardinality 2ℵ0.

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BibTeX
@misc{li2026persistence,
  title = {{Persistence of invariant graphs for twist maps under analytic perturbations}},
  author = {Qi Li and Yi Liu and Lin Wang},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2608.05239},
  eprint = {2608.05239},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2608.05239},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Persistence of invariant graphs for twist maps under analytic perturbations
AU  - Qi Li
AU  - Yi Liu
AU  - Lin Wang
PY  - 2026
DA  - 2026/10/15
PB  - arXiv
DO  - 10.48550/arxiv.2608.05239
UR  - https://arxiv.org/abs/2608.05239
AB  - We construct high-frequency perturbations of an integrable exact symplectic twist map which preserve an analytic invariant graph with a prescribed rotation number. Their oscillation frequencies may be any positive integers tending to infinity. For every fixed Gevrey parameter L>0, the perturbations tend to zero in a Gevrey-α norm and diverge in a Gevrey-(α−ε) norm. The frequency class strictly contains the α-Brjuno--Rüssmann class, and their difference has cardinality 2^ℵ_0.
ER  -