Demailly–Kollár openness conjecture for jumping numbers

Let φ\varphi be a plurisubharmonic germ at a point xx on a complex manifold, and let qOx\mathfrak q\subseteq\mathcal O_x be a nonzero ideal. Define

cxq(φ)=sup{c>0q2exp(2cφ) is locally integrable at x}.c_x^{\mathfrak q}(\varphi)=\sup\{c>0\mid |\mathfrak q|^2\exp(-2c\varphi)\text{ is locally integrable at }x\}.

Demailly–Kollár jumping-number openness conjecture. If cxq(φ)<c_x^{\mathfrak q}(\varphi)<\infty, then q2exp(2cxq(φ)φ)|\mathfrak q|^2\exp(-2c_x^{\mathfrak q}(\varphi)\varphi) is not locally integrable at xx.

The source describes this as a generalization of the original openness conjecture and as a semicontinuity statement for multiplier ideals. Its status is open in the generality considered.

Sources & referencesView supporting material

Primary source

Mattias Jonsson and Mircea Mustata, “An algebraic approach to the openness conjecture of Demailly and Kollar”, arXiv:1205.4273 (2013).

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