Exponents of Jacobians and relative class groups

Borys Kadets; Daniel Keliher

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arXiv · 2410.11962

Exponents of Jacobians and relative class groups

Borys Kadets·Daniel Keliher

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Abstract

We prove a lower bound for the exponent of the relative class group $\mathrm{Pic}^0 X_1/\phi^* \mathrm{Pic}^0 X_2$ for a covering of curves $X_1 \to X_2$ over a finite field $\mathbb{F}_q$. The results improve on the existing best bounds (due to Stichtenoth) in the case $X_2=\mathbb{P}^1$, when the relative class group equals the class group of the function field $\mathbb{F}_q(X_1)$, and are completely new for the genuinely relative situation.

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Borys Kadets, Daniel Keliher. 2024-10-15. Exponents of Jacobians and relative class groups. https://arxiv.org/abs/2410.11962

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