Addition in Jacobians of tropical hyperelliptic curves

Details Addition in Jacobians of tropical hyperelliptic curves Addition in Jacobians of tropical hyperelliptic curves

2011-11-29

arxiv.org/abs/1111.6657v1

Nonlinear Sciences

Exactly Solvable and Integrable Systems

23 pages, 8 figures, submitted to RIMS Kokyuroku Bessatsu

Scientific paper

We show that there exists a surjection from the set of effective divisors of degree $g$ on a tropical curve of genus $g$ to its Jacobian by using a tropical version of the Riemann-Roch theorem. We then show that the restriction of the surjection is reduced to the bijection on an appropriate subset of the set of effective divisors of degree $g$ on the curve. Thus the subset of effective divisors has the additive group structure induced from the Jacobian. We finally realize the addition in Jacobian of a tropical hyperelliptic curve of genus $g$ via the intersection with a tropical curve of degree $3g/2$ or $3(g-1)/2$.

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