Primitive algebraic points on curves
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arXiv
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| Format: | Preprint |
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2023
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| _version_ | 1866913355120246784 |
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| author | Khawaja, Maleeha Siksek, Samir |
| author_facet | Khawaja, Maleeha Siksek, Samir |
| contents | A number field $K$ is primitive if $K$ and $\mathbb{Q}$ are the only subextensions of $K$. Let $C$ be a curve defined over $\mathbb{Q}$. We call an algebraic point $P\in C(\overline{\mathbb{Q}})$ primitive if the number field $\mathbb{Q}(P)$ is primitive. We present several sets of sufficient conditions for a curve $C$ to have finitely many primitive points of a given degree $d$. For example, let $C/\mathbb{Q}$ be a hyperelliptic curve of genus $g$, and let $3 \le d \le g-1$. Suppose that the Jacobian $J$ of $C$ is simple. We show that $C$ has only finitely many primitive degree $d$ points, and in particular it has only finitely many degree $d$ points with Galois group $S_d$ or $A_d$. However, for any even $d \ge 4$, a hyperelliptic curve $C/\mathbb{Q}$ has infinitely many imprimitive degree $d$ points whose Galois group is a subgroup of $S_2 \wr S_{d/2}$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2306_17772 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Primitive algebraic points on curves Khawaja, Maleeha Siksek, Samir Number Theory 11G30 A number field $K$ is primitive if $K$ and $\mathbb{Q}$ are the only subextensions of $K$. Let $C$ be a curve defined over $\mathbb{Q}$. We call an algebraic point $P\in C(\overline{\mathbb{Q}})$ primitive if the number field $\mathbb{Q}(P)$ is primitive. We present several sets of sufficient conditions for a curve $C$ to have finitely many primitive points of a given degree $d$. For example, let $C/\mathbb{Q}$ be a hyperelliptic curve of genus $g$, and let $3 \le d \le g-1$. Suppose that the Jacobian $J$ of $C$ is simple. We show that $C$ has only finitely many primitive degree $d$ points, and in particular it has only finitely many degree $d$ points with Galois group $S_d$ or $A_d$. However, for any even $d \ge 4$, a hyperelliptic curve $C/\mathbb{Q}$ has infinitely many imprimitive degree $d$ points whose Galois group is a subgroup of $S_2 \wr S_{d/2}$. |
| title | Primitive algebraic points on curves |
| topic | Number Theory 11G30 |
| url | https://arxiv.org/abs/2306.17772 |