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Article Dans Une Revue Forum of Mathematics, Sigma Année : 2022

Where are the zeroes of a random p-adic polynomial?

Résumé

We study the repartition of the roots of a random p-adic polynomial in an algebraic closure of Qp. We prove that the mean number of roots generating a fixed finite extension K of Qp depends mostly on the discriminant of K, an extension containing less roots when it gets more ramified. We prove further that, for any positive integer r, a random p-adic polynomial of sufficiently large degree has about r roots on average in extensions of degree at most r. Beyond the mean, we also study higher moments and correlations between the number of roots in two given subsets of Qp (or, more generally, of a finite extension of Qp). In this perspective, we notably establish results highlighting that the roots tend to repel each other and quantify this phenomenon.
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Dates et versions

hal-02557280 , version 1 (28-04-2020)
hal-02557280 , version 2 (07-10-2021)

Identifiants

Citer

Xavier Caruso. Where are the zeroes of a random p-adic polynomial?. Forum of Mathematics, Sigma, 2022, 10, pp.e55. ⟨10.1017/fms.2022.27⟩. ⟨hal-02557280v2⟩
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