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arXiv 2107.05902math.NTmath.AG
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费马四次曲线的扭转的算术

The arithmetic of a twist of the Fermat quartic

Yasuhiro Ishitsuka, Tetsushi Ito, Tatsuya Ohshita

摘要:

研究了由$X^4 + Y^4 + Z^4 = 0$定义的Fermat四次方程的扭度的算法,其中没有$\mathbb{Q}$ -有理点.我们明确地计算了雅可比簇的Mordell-Weil群.我们证明了Picard群的度$0$部分是秩为$2$的自由$\mathbb{Z}/2\mathbb{Z}$ -模,而Mordell-Weil群是秩为$3$的自由$\mathbb{Z}/2\mathbb{Z}$ -模.因此,相对Brauer群是非平凡的。我们还表明,这四次违反了局部-全局性质的线性行列式表示。

英文摘要:

We study the arithmetic of the twist of the Fermat quartic defined by $X^4 + Y^4 + Z^4 = 0$ which has no $\mathbb{Q}$-rational point. We calculate the Mordell--Weil group of the Jacobian variety explicilty. We show that the degree $0$ part of the Picard group is a free $\mathbb{Z}/2\mathbb{Z}$-module of rank $2$, whereas the Mordell--Weil group is a free $\mathbb{Z}/2\mathbb{Z}$-module of rank $3$. Thus the relative Brauer group is non-trivial. We also show that this quartic violates the local-global property for linear determinantal representations.

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