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PFH spectral invariants and C^infty closing lemmas

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arxiv 2110.02463 v5 pith:DDUYXC2R submitted 2021-10-06 math.SG math.DS

PFH spectral invariants and C^infty closing lemmas

classification math.SG math.DS
keywords area-preservingclosinginftyinvariantslemmasperiodicspectraldelta
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We develop the theory of spectral invariants in periodic Floer homology (PFH) of area-preserving surface diffeomorphisms. We use this theory to prove $C^\infty$ closing lemmas for certain Hamiltonian isotopy classes of area-preserving surface diffeomorphisms. In particular, we show that for a $C^\infty$-generic area-preserving diffeomorphism of the torus, the set of periodic points is dense. Our closing lemmas are quantitative, asserting roughly speaking that for a given Hamiltonian isotopy, within time $\delta$ a periodic orbit must appear of period $O(\delta^{-1})$. We also prove a "Weyl law" describing the asymptotic behavior of PFH spectral invariants.

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