Effective convergence of coranks of random Rédei matrices
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Date
2024
Publication Type
Journal Article
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Abstract
We give effective estimates for the l1-distance between the corank distribution of r x r Redei matrices and the measure predicted by the Cohen-Lenstra heuristics. To this end we pinpoint a class of stochastic processes, which we call c-transitioning. These stochastic processes are well approximated by Markov processes, and we give an effective ergodic theorem for such processes. With this tool we make effective a theorem of Gerth (1984) that initiated the study of the Cohen-Lenstra heuristics for p = 2. Gerth's work triggered a series of developments that has recently culminated in the breakthrough of Smith (2017). The present work will be used in upcoming work of the authors on further applications of Smith's ideas to the arithmetic of quadratic fields. To this end we extend our main result to several other families of matrix spaces that occur in the study of integral points of the equation x2 - dy2 = l as d varies.
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Volume
212
Pages / Article No.
337 - 358
Publisher
Instytut Matematyczny Polskiej Akademii Nauk
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Subject
class groups; Rédei matrices; Markov chains