Spectral bounded isometry conjecture

Let (M,ω)(M,\omega) be a symplectic manifold, let Symp0(M,ω)\operatorname{Symp}_0(M,\omega) be its identity component, and let Ham(M,ω)\operatorname{Ham}(M,\omega) be the Hamiltonian subgroup. Let BI0(M,ω,γ)\operatorname{BI}_0(M,\omega,\gamma) denote the subgroup of symplectomorphisms bounded with respect to the spectral norm γ\gamma. Spectral bounded isometry conjecture.

BI0(M,ω,γ)=Ham(M,ω)for all (M,ω).\operatorname{BI}_0(M,\omega,\gamma)=\operatorname{Ham}(M,\omega)\qquad\text{for all }(M,\omega).

This is the spectral-norm analogue of the bounded isometry conjecture for the Hofer norm. The source formulates it as a conjecture after noting that the Hofer version is very hard and that partial results are known.

Sources & referencesView supporting material

Primary source

Zhigang Han, “A nonextension result on the spectral metric”, arXiv:0805.1045 (2008).

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