Abstract
We compute the diagonal restriction of the first derivative with respect to the weight of a p-adic family of Hilbert modular Eisenstein series attached to a general (odd) character of the narrow class group of a real quadratic field, and express the Fourier coefficients of its ordinary projection in terms of the values of a distinguished rigid analytic cocycle in the sense of Darmon and Vonk (Duke Math J, to appear, 2020) at appropriate real quadratic points of Drinfeld’s p-adic upper half-plane. This can be viewed as the p-adic counterpart of a seminal calculation of Gross and Zagier (J Reine Angew Math 355:191–220, 1985, §7) which arose in their “analytic proof” of the factorisation of differences of singular moduli, and whose inspiration can be traced to Siegel’s proof of the rationality of the values at negative integers of the Dedekind zeta function of a totally real field. Our main identity enriches the dictionary between the classical theory of complex multiplication and its extension to real quadratic fields based on RM values of rigid meromorphic cocycles, and leads to an expression for the p-adic logarithms of Gross–Stark units and Stark–Heegner points in terms of the first derivatives of certain twisted Rankin triple product p-adic L-functions.
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Notes
Its restriction to \(\hom (\mathbb {Z}_p^\times , 1+p\mathbb {Z}_p)\) is customarily denoted \(L_p(F, \psi \omega _p, s)\) in the literature.
Note that this differs from the notion of reducedness defined by Gauß in his Disquisitiones Arithmeticae [15]. Reduced forms in his sense are always reduced in our sense, but the converse is not true.
Note that this form may fail to be primitive.
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Acknowledgements
The authors are grateful to Marc Masdeu for numerically verifying the global nature of the point constructed in the final example of this paper. They also thank Francis Brown, Yingkun Li, David Loeffler, Don Zagier, and Sarah Zerbes for their support and for their interest in this work. The research of the Henri Darmon was supported by an NSERC discovery grant. Alice Pozzi was supported by the ERC-COG Grant 523950 ‘Euler Systems’. Jan Vonk was supported by ERC-COG Grant 724638 ‘GALOP’, the Carolyn and Franco Gianturco Fellowship at Linacre College (Oxford), the Max-Planck-Institut für Mathematik (Bonn), and NSF Grant No. DMS-1638352, during various stages of this project.
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Communicated by Wei Zhang.
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Darmon, H., Pozzi, A. & Vonk, J. Diagonal restrictions of p-adic Eisenstein families. Math. Ann. 379, 503–548 (2021). https://doi.org/10.1007/s00208-020-02086-2
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DOI: https://doi.org/10.1007/s00208-020-02086-2