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Elliptic Eisenstein series associated to ideals in real quadratic number fields (2303.17821v1)

Published 31 Mar 2023 in math.NT

Abstract: In this paper, we compute for odd fundamental discriminants $D>1$ the Fourier expansion of non-holomorphic elliptic Eisenstein series for $\Gamma_0(D)$ with quadratic nebentypus character $\chi_D$ satisfying a certain plus space condition. For each genus of $\mathbb{Q}(\sqrt{D})$, we obtain an associated plus space condition and corresponding Eisenstein series in all positive even weights. In weight $k=2$, the Fourier coefficients are associated to the geometry of Hirzebruch--Zagier divisors on Hilbert modular surfaces.

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