Sufficiency conjecture for multiplication profiles of hyperelliptic Jacobian point classes

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Let BB) be a hyperelliptic curve of genus \ga\ga, with a marked Weierstrass point qq, and let Θ10(B)⊂Jac⁡(B)\Theta_1^0(B)\subset \operatorname{Jac}(B) denote the relevant locus of point classes [p−q][p-q]. A multiplication profile is a sequence (\epi)i=1∞(\ep_i)_{i=1}^{\infty} recording the sizes of the supports of the qq-reductions of the multiples i[p−q]i[p-q]. Multiplication-profile sufficiency conjecture. Any sequence (\epi)i=1∞(\ep_i)_{i=1}^{\infty} of non-negative integers satisfying the five listed conditions—namely \ep1=1\ep_1=1 and 0≤\epj≤\ga0\leq \ep_j\leq \ga; subadditivity \epi+\epj≥\epi+j\ep_i+\ep_j\geq \ep_{i+j}; the adjacent-difference and nonrepetition conditions; the prohibition on \epj+1=\epj+1=\epj+2+1\ep_{j+1}=\ep_j+1=\ep_{j+2}+1 except when \epj=\ep2=0\ep_j=\ep_2=0; and the stated periodicity and symmetry after the first zero— is realized as the multiplication profile of some element [p−q]∈Θ10(B)⊂Jac⁡(B)[p-q]\in\Theta_1^0(B)\subset \operatorname{Jac}(B) for some hyperelliptic curve BB of genus \ga\ga. This would turn the necessary numerical conditions for multiplication profiles into a complete characterization, extending the paper's explicit classifications for cyclic covers and selected torsion orders. Whether every sequence satisfying these conditions is geometrically realizable remains open.

References

Primary source

Ethan Cotterill, Nathan Pflueger and Naizhen Zhang, “Weierstrass semigroups from cyclic covers of hyperelliptic curves”, arXiv:2201.00033 (2023).

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