General Floer homology and asymptotic growth conjecture for mapping classes

Let MM be a compact connected surface and let Γ=π0(Diff+(M))\Gamma=\pi_0(\operatorname{Diff}^+(M)). For any mapping class gΓg\in\Gamma, let ϕSympm(M,ω)\phi\in\operatorname{Symp}^m(M,\omega) be a monotone representative for a ϕ\phi-invariant area form ω\omega. Let UU be the neighborhood of the reducing curves, and let MidM_{\mathrm{id}} be the union of the components of Mint(U)M\setminus\operatorname{int}(U) on which ϕ\phi restricts to the identity. If ψ\psi is a standard Thurston canonical-form representative of gg, let λ\lambda be the largest stretching factor of its pseudo-Anosov pieces, with λ=1\lambda=1 when there is no pseudo-Anosov piece. Then

General Floer homology and asymptotic growth conjecture.

HF(ϕ)=H(Mid,Mid;Z2)Z2N(ϕMMid),HF_*(\phi)=H_*(M_{\mathrm{id}},\partial M_{\mathrm{id}};\mathbb{Z}_2)\oplus\mathbb{Z}_2^{N(\phi|_{M\setminus M_{\mathrm{id}}})},

and

F(g):=Growth(dimHF(ϕn))=λ=h(ψ)=lim supnN(ψn)1/n.F^{\infty}(g):=\operatorname{Growth}(\dim HF_*(\phi^n))=\lambda=h(\psi)=\limsup_{n\rightarrow\infty}|N(\psi^n)|^{1/n}.

This proposes a complete description of Floer homology for mapping classes in terms of the identity pieces and Nielsen data, together with an asymptotic growth formula governed by the largest pseudo-Anosov stretching factor. The supplied text does not state whether the conjecture has been resolved.

Sources & referencesView supporting material

Primary source

Alexander Fel'shtyn, “Floer Homology, Nielsen Theory and Symplectic Zeta Functions”, arXiv:math/0211032 (2003).

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