Iterated orthogonal extension conjecture from log-canonical centres

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Let XX be the space and let \vphiL\vphi_L, ψ\psi, ℓ\ell, \spH\spH, \spE\spE, σ\sigma, σmlc⁡\sigma_{\operatorname{mlc}}, \lcc\lcc, \multidl\paren\vphiL\multidl_{}\paren{\vphi_L}, and \RTF∣⋅∣(t)[σ]\RTF|\cdot|(t)[\sigma] be as in the paper. Assume that \spH=\spH[σ]⊕\spE\spH=\spH[\sigma]\oplus\spE is the orthogonal decomposition with respect to the squared norm \RTF∣⋅∣(1)[σ]\RTF|\cdot|(1)[\sigma]. Iterated orthogonal extension conjecture. There exists a constant b≥1b\geq 1, independent of \vphiL\vphi_L and ψ\psi, such that, after normalising log⁡\absℓψ≥b\log\abs{\ell\psi}\geq b on XX, for every f∈\spH[σmlc⁡+1]/\spH[1]f\in\spH[\sigma_{\operatorname{mlc}}+1]/\spH[1] one can inductively find Fσ∈\spEF_\sigma\in\spE, for σ=1,…,σmlc⁡\sigma=1,\dots,\sigma_{\operatorname{mlc}}, beginning with σ=σmlc⁡\sigma=\sigma_{\operatorname{mlc}}, so that for every such σ\sigma,

∑j=σσmlc⁡Fj≡f(mod\multidl\paren\vphiL⋅I\lcc)on X,\sum_{j=\sigma}^{\sigma_{\operatorname{mlc}}}F_j\equiv f\pmod{\multidl_{}\paren{\vphi_L}\cdot\mathcal{I}_{\lcc}}\quad\text{on }X,

and

\RTF∣Fσ∣(1)[σ]≤\RTF∣Fσ∣(0)[σ]=\RTF∣f−∑j=σ+1σmlc⁡Fj∣(0)[σ].\RTF|F_\sigma|(1)[\sigma]\leq\RTF|F_\sigma|(0)[\sigma]=\RTF|f-\sum_{j=\sigma+1}^{\sigma_{\operatorname{mlc}}}F_j|(0)[\sigma].

Consequently, F=∑σ=1σmlc⁡FσF=\sum_{\sigma=1}^{\sigma_{\operatorname{mlc}}}F_\sigma is a holomorphic extension of ff and, if additionally \absψ≥1\abs\psi\geq1 on XX, satisfies

\RTF∣F∣(1)[σmlc⁡]≤∑σ=1σmlc⁡\RTF∣Fσ∣(1)[σ]≤∑σ=1σmlc⁡\RTF∣Fσ∣(0)[σ].\RTF|F|(1)[\sigma_{\operatorname{mlc}}]\leq\sum_{\sigma=1}^{\sigma_{\operatorname{mlc}}}\RTF|F_\sigma|(1)[\sigma]\leq\sum_{\sigma=1}^{\sigma_{\operatorname{mlc}}}\RTF|F_\sigma|(0)[\sigma].

The conjecture proposes an iterated extension procedure from log-canonical centres with an L2L^2 estimate; its resolution is not indicated in the supplied text.

References

Primary source

Tsz On Mario Chan, “On an L^2 extension theorem from log-canonical centres with log-canonical measures”, arXiv:2008.03019 (2022).

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