The QALE Laplacian index-set and Fredholm conjecture

Let (X,J,g)(X,J,g) be a QALE Kähler manifold asymptotic to Cm/G\mathbb{C}^m/G, and let nn be the complex codimension of the singular set of Cm/G\mathbb{C}^m/G. The set IX\mathcal{I}_X consists of the weight pairs satisfying

IX={(β,γ)R2:β<0,22n<γ<0,β+γ>22m}.\mathcal{I}_X=\bigl\{(\beta,\gamma)\in\mathbb{R}^2:\beta<0,\quad 2-2n<\gamma<0,\quad\beta+\gamma>2-2m\bigr\}.

For generic β,γR\beta,\gamma\in\mathbb{R}, consider the weighted Laplacian

Δ:Cβ,γk+2,α(X)Cβ,γ2k,α(X).\Delta:C^{k+2,\alpha}_{\beta,\gamma}(X)\longrightarrow C^{k,\alpha}_{\beta,\gamma-2}(X).

The QALE Laplacian index-set and Fredholm conjecture. The displayed description of IX\mathcal{I}_X holds, and the displayed map is Fredholm, with finite-dimensional kernel and cokernel, for generic β,γR\beta,\gamma\in\mathbb{R}.

These assertions describe the expected exceptional weight region and Fredholm behavior for the Laplacian on QALE Kähler manifolds. The source presents them as beliefs rather than established results, and supplies no resolution evidence.

Sources & referencesView supporting material

Primary source

Dominic Joyce, “Quasi-ALE metrics with holonomy SU(m) and Sp(m)”, arXiv:math/9905043 (1999).

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