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Nonvanishing of $$L$$-series associated to cubic twists of elliptic curves. (English) Zbl 0817.11029
The 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.

##### MSC:
 11F67 Special values of automorphic $$L$$-series, periods of automorphic forms, cohomology, modular symbols 11G05 Elliptic curves over global fields
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