For a relatively minimal fibration $f : X \to \mathbb{P}^1$ of non-hyperelliptic curves of genus $g$, we know the Picard number $\rho(X) \leq 3g + 8$. We study the case where $\rho(X) = 3g + 8$ and the Mordell–Weil group of $f$ is trivial. Such an $f$ occurs only if $g \equiv 0$ or $1 \pmod{3}$, and we describe such $f : X \to \mathbb{P}^1$ explicitly.
J. Math. Soc. Japan
73(2):
505-524
(April, 2021).
DOI: 10.2969/jmsj/82438243
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