Hybrid level aspect subconvexity for GL(2) × GL(1) Rankin-Selberg L-FunctionsArticle
Authors: Keshav Aggarwal 1,2; Yeongseong Jo 1,2; Kevin Nowland 1,2
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Keshav Aggarwal;Yeongseong Jo;Kevin Nowland
1 Mathematics Department, The Ohio State University
2 Department of Mathematics [Ohio State University]
Let $M$ be a squarefree positive integer and $P$ a prime number coprime to $M$ such that $P \sim M^{\eta}$ with $0 < \eta < 2/5$. We simplify the proof of subconvexity bounds for $L(\frac{1]{2}, f \otimes \chi)$ when $f$ is a primitive holomorphic cusp form of level $P$ and $\chi$ is a primitive Dirichlet character modulo $M$. These bounds are attained through an unamplified second moment method using a modified version of the delta method due to R. Munshi. The technique is similar to that used by Duke-Friedlander-Iwaniec save for the modification of the delta method.