Sufficiency conjecture for multiplication profiles of hyperelliptic Jacobian point classes

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 [pq][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[pq]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 [pq]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.

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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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