Subconvexity for a double Dirichlet series

Details Subconvexity for a double Dirichlet series Subconvexity for a double Dirichlet series

2009-07-28

arxiv.org/abs/0907.4867v1

Mathematics

Number Theory

17 pages

Scientific paper

For Dirichlet series roughly of the type $Z(s, w) = sum_d L(s, chi_d) d^{-w}$ the subconvexity bound $Z(s, w) \ll (sw(s+w))^{1/6+\varepsilon}$ is proved on the critical lines $\Re s = \Re w = 1/2$. The convexity bound would replace 1/6 with 1/4. In addition, a mean square bound is proved that is consistent with the Lindel\"of hypothesis. An interesting specialization is $s=1/2$ in which case the above result give a subconvex bound for a Dirichlet series without an Euler product.

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