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| Formato: | Preprint |
| Publicado: |
2026
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| Acceso en línea: | https://arxiv.org/abs/2605.26482 |
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| _version_ | 1866911718016286720 |
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| author | Zhu, Sophie |
| author_facet | Zhu, Sophie |
| contents | Let $r\in\mathbb{C}$, let $K$ be a finite extension of $\mathbb{Q}$, let $I_K$ be the monoid of integral ideals in the ring of integers $\mathcal{O}_K$ of $K$, and let $χ$ be a Dirichlet character. Then define the twisted ideal divisor function $σ_{r, K, χ} : I_K \rightarrow \mathbb{C}$ by $$σ_{r,K,χ}(I) = \sum_{J \mid I} N(J)^{-r}χ(N(J)),$$ where $N$ denotes the ideal norm. For real $r>1,$ we study the number of connected components $C_{r, K, χ}$ of the closure $\overline{σ_{r,K,χ}(I_K)}$, writing $C_{r,K}$ when $χ$ is the principal character modulo 1. We prove that $C_{r,K,χ}$ is finite when $χ$ is real-valued. When $K = \mathbb{Q}$, we show that for fixed $r > 1,$ every sufficiently large positive integer is realized as $C_{r,\mathbb{Q},χ},$ and if $r$ is sufficiently large, then every positive integer is realized as $χ$ varies. For finite Galois extensions $K$ over $\mathbb{Q}$, we exhibit new exponential lower bounds for $C_{r,K},$ and we prove that for every fixed integer $s \geq 2$, the values $C_{r,K}$ are unbounded as $K$ ranges over degree-$s$ extensions of $\mathbb{Q}$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_26482 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Connected components of the ranges of twisted divisor functions on number fields Zhu, Sophie Number Theory Let $r\in\mathbb{C}$, let $K$ be a finite extension of $\mathbb{Q}$, let $I_K$ be the monoid of integral ideals in the ring of integers $\mathcal{O}_K$ of $K$, and let $χ$ be a Dirichlet character. Then define the twisted ideal divisor function $σ_{r, K, χ} : I_K \rightarrow \mathbb{C}$ by $$σ_{r,K,χ}(I) = \sum_{J \mid I} N(J)^{-r}χ(N(J)),$$ where $N$ denotes the ideal norm. For real $r>1,$ we study the number of connected components $C_{r, K, χ}$ of the closure $\overline{σ_{r,K,χ}(I_K)}$, writing $C_{r,K}$ when $χ$ is the principal character modulo 1. We prove that $C_{r,K,χ}$ is finite when $χ$ is real-valued. When $K = \mathbb{Q}$, we show that for fixed $r > 1,$ every sufficiently large positive integer is realized as $C_{r,\mathbb{Q},χ},$ and if $r$ is sufficiently large, then every positive integer is realized as $χ$ varies. For finite Galois extensions $K$ over $\mathbb{Q}$, we exhibit new exponential lower bounds for $C_{r,K},$ and we prove that for every fixed integer $s \geq 2$, the values $C_{r,K}$ are unbounded as $K$ ranges over degree-$s$ extensions of $\mathbb{Q}$. |
| title | Connected components of the ranges of twisted divisor functions on number fields |
| topic | Number Theory |
| url | https://arxiv.org/abs/2605.26482 |