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| Main Authors: | , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2510.01422 |
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| _version_ | 1866908572923723776 |
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| author | Gendron, T. M. Zenteno, A. |
| author_facet | Gendron, T. M. Zenteno, A. |
| contents | This paper introduces an archimedean, locally Cantor multi-field $\mathcal{O}_θ$ which gives an analog of the $p$-adic number field at a place at infinity of a real quadratic extension $K$ of $\mathbb{Q}$. This analog is defined using a unit $1<θ\in \mathcal{O}_{K}^{\times}$, which plays the same role as the prime $p$ does in $\mathbb{Z}_{p}$; the elements of $\mathcal{O}_θ$ are then greedy Laurent series in the base $θ$. There is a canonical inclusion of the integers $\mathcal{O}_{K}$ with dense image in $\mathcal{O}_θ$ and the operations of sum and product extend to multi-valued operations having at most three values, making $\mathcal{O}_θ$ a multi-field in the sense of Marty. We show that the (geometric) completions of 1-dimensional quasicrystals contained in $\mathcal{O}_{K}$ map canonically to $\mathcal{O}_θ$. The motivation for this work arises in part from a desire to obtain a more arithmetic treatment of a place at infinity by replacing $\mathbb{R}$ with $\mathcal{O}_θ$, with an eye toward obtaining a finer version of class field theory incorporating the ideal arithmetic of quasicrystal rings. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_01422 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The $θ$-adics Gendron, T. M. Zenteno, A. Number Theory This paper introduces an archimedean, locally Cantor multi-field $\mathcal{O}_θ$ which gives an analog of the $p$-adic number field at a place at infinity of a real quadratic extension $K$ of $\mathbb{Q}$. This analog is defined using a unit $1<θ\in \mathcal{O}_{K}^{\times}$, which plays the same role as the prime $p$ does in $\mathbb{Z}_{p}$; the elements of $\mathcal{O}_θ$ are then greedy Laurent series in the base $θ$. There is a canonical inclusion of the integers $\mathcal{O}_{K}$ with dense image in $\mathcal{O}_θ$ and the operations of sum and product extend to multi-valued operations having at most three values, making $\mathcal{O}_θ$ a multi-field in the sense of Marty. We show that the (geometric) completions of 1-dimensional quasicrystals contained in $\mathcal{O}_{K}$ map canonically to $\mathcal{O}_θ$. The motivation for this work arises in part from a desire to obtain a more arithmetic treatment of a place at infinity by replacing $\mathbb{R}$ with $\mathcal{O}_θ$, with an eye toward obtaining a finer version of class field theory incorporating the ideal arithmetic of quasicrystal rings. |
| title | The $θ$-adics |
| topic | Number Theory |
| url | https://arxiv.org/abs/2510.01422 |