The general -adic convergence conjecture for Hayes-module exponentials and logarithms
The general -adic convergence conjecture for Hayes-module exponentials and logarithms
Let be a Hayes module on , with no restriction on the genus of or on , and let be the field of definition of . Fix a place of different from , normalized so that the value group is . Let be the finite field extension of containing all zeros of the Drinfeld divisor corresponding to . Fix an embedding , let be the place of over , normalized so that its value group is , and let be the ramification index of over .
General -adic convergence conjecture. The exponential series converges in whenever
where is an ideal depending on the Drinfeld divisor evaluated at , and are positive integers depending respectively on ramification and inertia. The logarithm series converges in whenever , and the -adic valuation of its coefficients has order of magnitude .
This conjecture extends the convergence results from the genus-zero example to Hayes modules on arbitrary curves and with arbitrary . A principal difficulty is obtaining an explicit integral model for the shtuka function with all zeros integral and expressing the differential in terms of that shtuka function.
Sources & referencesView supporting material
Primary source
Kwun Chung, “Factorization of Coefficients for Exponential and Logarithm in Function Fields”, arXiv:2010.12979 (2020).
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