The indecomposable theta-multiplicity conjecture

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Let SkS_k be the locus of principally polarized abelian varieties (A,Θ)(A,\Theta) for which there exists z∈Az\in A with mult⁡zΘ≥k\operatorname{mult}_z\Theta\geq k, and let Agind{\mathcal A}_g^{\mathrm{ind}} be the indecomposable locus.

Theta-multiplicity conjecture.

Agind∩S⌊g+32⌋=∅.{\mathcal A}_g^{\mathrm{ind}}\cap S_{\left\lfloor\frac{g+3}{2}\right\rfloor}=\emptyset.

The conjecture reflects the expected bounds on theta-divisor multiplicities for Jacobians and Prym varieties. The source gives no resolution status.

References

Primary source

Samuel Grushevsky, “The Schottky Problem”, arXiv:1009.0369 (2010).

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