Iterated orthogonal extension conjecture from log-canonical centres

From papers

Let XX be the space and let \vphiL\vphi_L, ψ\psi, \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 b1b\geq 1, independent of \vphiL\vphi_L and ψ\psi, such that, after normalising log\absψb\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=σσmlcFjf(mod\multidl\paren\vphiLI\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

\RTFFσ(1)[σ]\RTFFσ(0)[σ]=\RTFfj=σ+1σmlcFj(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=1σmlcFσF=\sum_{\sigma=1}^{\sigma_{\operatorname{mlc}}}F_\sigma is a holomorphic extension of ff and, if additionally \absψ1\abs\psi\geq1 on XX, satisfies

\RTFF(1)[σmlc]σ=1σmlc\RTFFσ(1)[σ]σ=1σmlc\RTFFσ(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.

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Sources & referencesView supporting material

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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