The GG conjecture on singularities after resolving the discriminant locus

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=LkP=|\mathcal L^k|. A resolution of the discriminant locus is a projective variety SS with a birational morphism f:SPf: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:SP=Lkf:S\to P=|\mathcal L^k| of the discriminant locus such that, for any Deligne cohomology class ω\omega mapping to ζ\zeta, fν(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.

Sources & referencesView supporting material

Primary source

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

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