Arboreal Galois Groups of a PCF Map with Strictly Pre-periodic Critical Points
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arXiv
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| Autores principales: | , , , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| _version_ | 1866910246072483840 |
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| author | Ejder, Özlem Gołaska, Zofia Kara, Yasemin Nienhaus, Leonie Ülkem, Özge |
| author_facet | Ejder, Özlem Gołaska, Zofia Kara, Yasemin Nienhaus, Leonie Ülkem, Özge |
| contents | We study the arithmetic and geometric iterated monodromy groups associated to the postcritically finite (PCF) quadratic rational function $f(x)=\frac{2}{(x-1)^2}$ defined over a number field $k$, whose critical points are both strictly pre-periodic. We give explicit recursive descriptions of the topological generators of the geometric iterated monodromy group of $f$ and show that the arithmetic iterated monodromy group has Hausdorff dimension zero. We describe an explicit criterion to determine the values $a\in k$ for which the associated arboreal Galois group achieves its maximum possible size. In particular, we show that maximality of the arboreal Galois group can already be verified at level four, which is computationally accessible. Finally, we determine the intersection of the constant field of the arithmetic iterated monodromy group with $k(μ_{2^{\infty}})$, providing the first full study of a PCF quadratic map with non-abelian constant field. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_22466 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Arboreal Galois Groups of a PCF Map with Strictly Pre-periodic Critical Points Ejder, Özlem Gołaska, Zofia Kara, Yasemin Nienhaus, Leonie Ülkem, Özge Number Theory Group Theory 11G32, 37P05, 37P15, 12F10 We study the arithmetic and geometric iterated monodromy groups associated to the postcritically finite (PCF) quadratic rational function $f(x)=\frac{2}{(x-1)^2}$ defined over a number field $k$, whose critical points are both strictly pre-periodic. We give explicit recursive descriptions of the topological generators of the geometric iterated monodromy group of $f$ and show that the arithmetic iterated monodromy group has Hausdorff dimension zero. We describe an explicit criterion to determine the values $a\in k$ for which the associated arboreal Galois group achieves its maximum possible size. In particular, we show that maximality of the arboreal Galois group can already be verified at level four, which is computationally accessible. Finally, we determine the intersection of the constant field of the arithmetic iterated monodromy group with $k(μ_{2^{\infty}})$, providing the first full study of a PCF quadratic map with non-abelian constant field. |
| title | Arboreal Galois Groups of a PCF Map with Strictly Pre-periodic Critical Points |
| topic | Number Theory Group Theory 11G32, 37P05, 37P15, 12F10 |
| url | https://arxiv.org/abs/2605.22466 |