Hybrid subconvexity for class group 𝐿-functions and uniform sup norm bounds of Eisenstein series
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AbstractIn this paper, we study hybrid subconvexity bounds for class group 𝐿-functions associated to quadratic extensions 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)\ll_{\varepsilon}y^{1/2}(\lvert t\rvert+1)^{1/3+\varepsilon}, y\gg 1, extending work of Blomer and Titchmarsh. Finally, we propose a uniform version of the sup norm conjecture for Eisenstein series.
2017 ◽
Vol 19
(5)
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pp. 1545-1576
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2008 ◽
Vol 189
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pp. 139-154
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2019 ◽
Vol 38
(4)
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pp. 127-135
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2018 ◽
Vol 19
(2)
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pp. 581-596
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