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Toy models for D. H. Lehmer's conjecture

机译:D.H. Lehmer猜想的玩具模型

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In 1947, Lehmer conjectured that the Ramanujanτ-function τ(m) never vanishes for all positive integers m, where τ(m) are the Fourier coefficients of the cusp form Δ24 of weight 12. Lehmer verified the conjecture in 1947 for m < 214928639999. In 1973, Serre verified up to m < 10~(15), and in 1999, Jordan and Kelly for m < 22689242781695999.rnThe theory of spherical t-design, and in particular those which are the shells of Euclidean lattices, is closely related to the theory of modular forms, as first shown by Venkov in 1984. In particular, Ramanujan's r-function gives the coefficients of a weighted theta series of the E_8-lattice. It is shown, by Venkov, de la Harpe, and Pache, that τ(m) = 0 is equivalent to the fact that the shell of norm 2m of the τ8-lattice is an 8-design. So, Lehmer's conjecture is reformulated in terms of spherical t-design.rnLehmer's conjecture is difficult to prove, and still remains open. In this paper, we consider toy models of Lehmer's conjecture. Namely, we show that the m-th Fourier coefficient of the weighted theta series of the Z~2-lattice and the A_2-attice does not vanish, when the shell of norm m of those lattices is not the empty set. In other words, the spherical 5 (resp. 7)-design does not exist among the shells in the Z~2-lattice (resp.A_2-lattice).
机译:1947年,雷曼(Lehmer)猜想,对于所有正整数m,拉曼努詹τ函数τ(m)都不会消失,其中τ(m)是权重12的点状形式的傅立叶系数。雷曼(Lehmer)于1947年验证了m <214928639999的猜想。1973年,Serre验证了m <10〜(15),1999年,Jordan和Kelly验证了m <22689242781695999.rn球形t设计的理论,尤其是作为欧几里得晶格的壳的理论非常接近这与1984年由Venkov首次提出的模块化形式理论有关。特别是,拉马努詹的r函数给出了E_8格的加权theta级数的系数。 Venkov,de la Harpe和Pache证明τ(m)= 0等效于τ8格的范数2m的壳为8设计的事实。因此,Lehmer的猜想是根据球面t设计重新制定的。rnLehmer的猜想很难证明,而且仍然是开放的。在本文中,我们考虑了Lehmer猜想的玩具模型。即,我们证明了当Z〜2格和A_2格的加权theta级数的第m个傅立叶系数不消失时,这些格的范数m不是空集。换句话说,在Z〜2-晶格(分别为A_2-晶格)的壳之间不存在球形5(分别为7)的设计。

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