The splitting field and generators of the elliptic surface $Y^2=X^3 +t^{360} +1$

Sajad Salami

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arXiv · 2512.25009

The splitting field and generators of the elliptic surface $Y^2=X^3 +t^{360} +1$

Sajad Salami

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Abstract

The splitting field of an elliptic surface $\mathcal{E}/\mathbb{Q}(t)$ is the smallest finite extension $\mathcal{K} \subset \mathbb{C}$ such that all $\mathbb{C}(t)$-rational points are defined over $\mathcal{K}(t)$. In this paper, we provide a symbolic algorithmic approach to determine the splitting field and a set of $68$ linearly independent generators for the Mordell--Weil lattice of Shioda's elliptic surface $Y^2=X^3 +t^{360} +1$. This surface is noted for having the largest known rank 68 for an elliptic curve over $\mathbb{C}(t)$. Our methodology utilizes the known decomposition of the Mordell-Weil Lattice of this surface into Lattices of ten rational elliptic surfaces and one $K3$ surface. We explicitly compute the defining polynomials of the splitting field, which reach degrees of 1728 and 5760, and verify the results via height pairing matrices and specialized symbolic software packages.

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Sajad Salami. 2026-01-10. The splitting field and generators of the elliptic surface $Y^2=X^3 +t^{360} +1$. https://arxiv.org/abs/2512.25009

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