Nonvanishing of \(L\)-series associated to cubic twists of elliptic curves.

*(English)*Zbl 0817.11029The purpose of this paper is to prove that in any arithmetic progression \(D: D\equiv c\pmod p\) (\(p\neq 3\), a prime and \((c,p)=1\)) there are infinitely many cube-free elements \(D\) so that the \(L\)-function of the elliptic curve \(X^ 3+ Y^ 3=d\) does not vanish at 1. In view of the theorem of Coates-Wiles it follows that the curve has only finitely many rational points. The proof is based on an observation of D. Bump and J. Hoffstein [Invent. Math. 84, 481-505 (1986; Zbl 0591.10018)], that the \(L\)-functions in question essentially arise as the Fourier coefficients of a cubic metaplectic form, namely an Eisenstein series induced from a cubic metaplectic form on GL(2). The author computes these coefficients carefully and makes use of the Rankin-Selberg convolution with a metaplectic Eisenstein series on GL(2) to obtain the necessary analytic continuation to deduce the theorem above.

Reviewer: S.J.Patterson (GĂ¶ttingen)

##### MSC:

11F67 | Special values of automorphic \(L\)-series, periods of automorphic forms, cohomology, modular symbols |

11G05 | Elliptic curves over global fields |