The GG conjecture on singularities after resolving the discriminant locus

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Let XX be a projective complex variety of dimension 2n2n, let L\mathcal L be a very ample invertible sheaf, and let ζ\zeta be a non-torsion primitive Hodge class. For an integer kk, set P=∣Lk∣P=|\mathcal L^k|. A resolution of the discriminant locus is a projective variety SS with a birational morphism f:S→Pf:S\to P such that the inverse image of the discriminant locus is a divisor with normal crossings. If ω\omega is a Deligne cohomology class mapping to ζ\zeta, write ν(ω,Lk)\nu(\omega,\mathcal L^k) for the associated normal function.

GG conjecture. For every non-torsion primitive Hodge class ζ\zeta, there is an integer kk and a resolution f:S→P=∣Lk∣f:S\to P=|\mathcal L^k| of the discriminant locus such that, for any Deligne cohomology class ω\omega mapping to ζ\zeta, f∗ν(ω,Lk)f^*\nu(\omega,\mathcal L^k) is singular on SS.

This strengthens the expectation that primitive Hodge classes give rise to singular normal functions by requiring singularity after a resolution of the discriminant locus and for every Deligne lift of the class. The supplied text gives no resolution status.

References

Primary source

Patrick Brosnan, Hao Fang, Zhaohu Nie and Gregory Pearlstein, “Singularities of admissible normal functions”, arXiv:0711.0964 (2008).

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