Demailly–Kollár openness conjecture for jumping numbers

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

cxq(φ)=sup⁡{c>0∣∣q∣2exp⁡(−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 ∣q∣2exp⁡(−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.

References

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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