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A Positive Proportion of Cubic Curves over ℚ Admit Linear Determinantal Representations


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1 Department of Mathematics, Kyoto University, Kyoto 606-8502, Japan
     

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Can a smooth plane cubic be defined by the determinant of a square matrix with entries in linear forms in three variables? If we can, we say that it admits a linear determinantal representation. In this paper, we investigate linear determinantal representations of smooth plane cubics over various fields, and prove that any smooth plane cubic over a large field (or an ample field) admits a linear determinantal representation. Since local fields are large, any smooth plane cubic over a local field always admits a linear determinantal representation. As an application, we prove that a positive proportion of smooth plane cubics over ℚ, ordered by height, admit linear determinantal representations. We also prove that, if the conjecture of Bhargava–Kane–Lenstra–Poonen–Rains on the distribution of Selmer groups is true, a positive proportion of smooth plane cubics over ℚ fail the local-global principle for the existence of linear determinantal representations.
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  • A Positive Proportion of Cubic Curves over ℚ Admit Linear Determinantal Representations

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Authors

Yasuhiro Ishitsuka
Department of Mathematics, Kyoto University, Kyoto 606-8502, Japan

Abstract


Can a smooth plane cubic be defined by the determinant of a square matrix with entries in linear forms in three variables? If we can, we say that it admits a linear determinantal representation. In this paper, we investigate linear determinantal representations of smooth plane cubics over various fields, and prove that any smooth plane cubic over a large field (or an ample field) admits a linear determinantal representation. Since local fields are large, any smooth plane cubic over a local field always admits a linear determinantal representation. As an application, we prove that a positive proportion of smooth plane cubics over ℚ, ordered by height, admit linear determinantal representations. We also prove that, if the conjecture of Bhargava–Kane–Lenstra–Poonen–Rains on the distribution of Selmer groups is true, a positive proportion of smooth plane cubics over ℚ fail the local-global principle for the existence of linear determinantal representations.

References