Maximal curves over finite fields and a modular isogeny
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866910921487548416 |
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| author | Dose, Valerio Lido, Guido Mercuri, Pietro Stirpe, Claudio |
| author_facet | Dose, Valerio Lido, Guido Mercuri, Pietro Stirpe, Claudio |
| contents | We prove the existence of curves of genus $7$ and $12$ over the field with $11^5$ elements, reaching the Hasse-Weil-Serre upper bound. These curves are quotients of modular curves and we give explicit equations. We compute the number of points of many quotient modular curves in the same family without providing equations. For various pairs (genus, finite field) we find new records for the largest known number of points. In other instances we find quotient modular curves that are maximal, matching already known results. To perform these computations, we provide a generalization of Chen's isogeny result. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_18894 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Maximal curves over finite fields and a modular isogeny Dose, Valerio Lido, Guido Mercuri, Pietro Stirpe, Claudio Number Theory 11G20, 11G18, 11T71, 14G35 We prove the existence of curves of genus $7$ and $12$ over the field with $11^5$ elements, reaching the Hasse-Weil-Serre upper bound. These curves are quotients of modular curves and we give explicit equations. We compute the number of points of many quotient modular curves in the same family without providing equations. For various pairs (genus, finite field) we find new records for the largest known number of points. In other instances we find quotient modular curves that are maximal, matching already known results. To perform these computations, we provide a generalization of Chen's isogeny result. |
| title | Maximal curves over finite fields and a modular isogeny |
| topic | Number Theory 11G20, 11G18, 11T71, 14G35 |
| url | https://arxiv.org/abs/2504.18894 |