Higher-order blow-up differential-form complex conjecture

Let TT be a simplex, let T~\widetilde{T} denote its blow-up, and let bP1Λkb\mathcal P_1^-\Lambda^k be the shadow-form or blow-up Whitney-form complex and bPrΛ0b\mathcal P_r\Lambda^0 the higher-order blow-up scalar fields. For each flag or face FF of T~\widetilde{T}, let bPrΛk(F)b\mathcal P_r^-\Lambda^k(F) be the restriction of the full space to FF, and let bP˚rΛk(F)b\mathring{\mathcal P}_r^-\Lambda^k(F) be the subspace of forms vanishing on F\partial F. Using F˚jT˚j\mathring F\cong\prod_j\mathring T_j, define the corresponding classical spaces P˚rΛk(F)\mathring{\mathcal P}_r^-\Lambda^k(F) by the tensor-product construction from the classical FEEC spaces P˚rΛk(Tj)\mathring{\mathcal P}_r^-\Lambda^k(T_j). Higher-order blow-up FEEC conjecture. The spaces bP1Λkb\mathcal P_1^-\Lambda^k and bPrΛ0b\mathcal P_r\Lambda^0 can be generalized to a differential complex bPrΛkb\mathcal P_r^-\Lambda^k that is exact except at k=0k=0. For r1r\geq1, these spaces admit a blow-up geometric decomposition: bases can be constructed whose each kk-form has a unique minimal face of T~\widetilde{T} on which it does not vanish. Moreover, for every flag or face FF of T~\widetilde{T}, the trace-vanishing spaces bP˚rΛk(F)b\mathring{\mathcal P}_r^-\Lambda^k(F) are isomorphic to the corresponding classical spaces P˚rΛk(F)\mathring{\mathcal P}_r^-\Lambda^k(F). This conjecture proposes an extension of finite element exterior calculus to blow-up simplices; unlike faces of TT, interiors of faces of T~\widetilde{T} are products of simplices. The source gives no resolution.

Sources & referencesView supporting material

Primary source

Yakov Berchenko-Kogan and Evan S. Gawlik, “Blow-up Whitney forms, shadow forms, and Poisson processes”, arXiv:2402.03198 (2024).

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