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AbstractIn this paper, we study hybrid subconvexity bounds for class group L-functions associated to quadratic extensions K/ℚ{K/\mathbb{Q}} (real or imaginary).Our proof relies on relating the class group L-functions to Eisenstein series evaluated at Heegner points using formulas due to Hecke.The main technical contribution is the uniform sup norm bound for Eisenstein series E(z,1/2+it)≪εy1/2(|t|+1)1/3+ε{E(z,1/2+it)\ll_{\varepsilon}y^{1/2}(\lvert t\rvert+1)^{1/3+\varepsilon}}, y≫1{y\gg 1}, extending work of Blomer and Titchmarsh.Finally, we propose a uniform version of the sup norm conjecture for Eisenstein series.
Forum Mathematicum – de Gruyter
Published: Jan 1, 2021
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