Abstract
This article extends recent results on log-Coulomb gases in a \(p\)-field \(K\) (i.e., a nonarchimedean local field) to those in its projective line \(\mathbb{P}^1(K)\), where the latter is endowed with the \(PGL_2\)-invariant Borel probability measure and spherical metric. Our first main result is an explicit combinatorial formula for the canonical partition function of log-Coulomb gases in \(\mathbb{P}^1(K)\) with arbitrary charge values. Our second main result is called the “\((q+1)\)th Power Law”, which relates the grand canonical partition functions for one-component gases in \(\mathbb{P}^1(K)\) (where all particles have charge 1) to those in the open and closed unit balls of \(K\) in a simple way. The final result is a quadratic recurrence for the canonical partition functions for one-component gases in both unit balls of \(K\) and in \(\mathbb{P}^1(K)\). In addition to efficient computation of the canonical partition functions, the recurrence provides their “\(q\to 1\)” limits and “\(q\mapsto q^{-1}\)” functional equations.
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Acknowledgments
I would like to thank Clay Petsche for confirming several details about the measure and metric on \(\mathbb{P}^1(K)\), and I would like to thank Chris Sinclair for many useful suggestions regarding the Power Laws and the Quadratic Recurrence. Finally, I would like to thank the referees for their careful review of the manuscript and their many helpful suggestions.
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Webster, J. log-Coulomb Gases in the Projective Line of a \(p\)-Field. P-Adic Num Ultrametr Anal Appl 15, 59–80 (2023). https://doi.org/10.1134/S2070046623010041
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DOI: https://doi.org/10.1134/S2070046623010041