Varieties with ample Frobenius-trace kernel
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arXiv
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| Format: | Preprint |
| Published: |
2021
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| _version_ | 1866913058054471680 |
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| author | Carvajal-Rojas, Javier Patakfalvi, Zsolt |
| author_facet | Carvajal-Rojas, Javier Patakfalvi, Zsolt |
| contents | In the search of a projective analog of Kunz's theorem and a Frobenius-theoretic analog of Mori--Hartshorne's theorem, we investigate the positivity of the kernel of the Frobenius trace (equivalently, the negativity of the cokernel of the Frobenius endomorphism) on a smooth projective variety over an algebraically closed field of positive characteristic. For instance, such kernel is ample for projective spaces. Conversely, we show that for curves, surfaces, and threefolds the Frobenius trace kernel is ample only for Fano varieties of Picard rank $1$. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2110_15035 |
| institution | arXiv |
| publishDate | 2021 |
| record_format | arxiv |
| spellingShingle | Varieties with ample Frobenius-trace kernel Carvajal-Rojas, Javier Patakfalvi, Zsolt Algebraic Geometry Commutative Algebra 14G17, 14J45, 14E30, 14J30, 14J26 In the search of a projective analog of Kunz's theorem and a Frobenius-theoretic analog of Mori--Hartshorne's theorem, we investigate the positivity of the kernel of the Frobenius trace (equivalently, the negativity of the cokernel of the Frobenius endomorphism) on a smooth projective variety over an algebraically closed field of positive characteristic. For instance, such kernel is ample for projective spaces. Conversely, we show that for curves, surfaces, and threefolds the Frobenius trace kernel is ample only for Fano varieties of Picard rank $1$. |
| title | Varieties with ample Frobenius-trace kernel |
| topic | Algebraic Geometry Commutative Algebra 14G17, 14J45, 14E30, 14J30, 14J26 |
| url | https://arxiv.org/abs/2110.15035 |