Converse theorems assuming a partial Euler product

Details Converse theorems assuming a partial Euler product Converse theorems assuming a partial Euler product

2004-08-17

arxiv.org/abs/math/0408221v2

Mathematics

Number Theory

12 pages, LaTeX. Final version. To appear in The Ramanujan Journal

Scientific paper

Associated to a newform $f(z)$ is a Dirichlet series $L_f(s)$ with functional equation and Euler product. Hecke showed that if the Dirichlet series $F(s)$ has a functional equation of a particular form, then $F(s)=L_f(s)$ for some holomorphic newform $f(z)$ on $\Gamma(1)$. Weil extended this result to $\Gamma_0(N)$ under an assumption on the twists of $F(s)$ by Dirichlet characters. Conrey and Farmer extended Hecke's result for certain small $N$, assuming that the local factors in the Euler product of $F(s)$ were of a special form. We make the same assumption on the Euler product and describe an approach to the converse theorem using certain additional assumptions. Some of the assumptions may be related to second order modular forms.

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