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- Bannai Eiichi
- Faculty of Mathematics, Graduate School, Kyushu University
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- Miezaki Tsuyoshi
- Division of Mathematics, Graduate School of Information Sciences, Tohoku University
書誌事項
- タイトル別名
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- Toy models for D. H. Lehmer's conjecture
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抄録
In 1947, Lehmer conjectured that the Ramanujan τ-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 < 1015, and in 1999, Jordan and Kelly for m < 22689242781695999. <br>The 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 τ-function gives the coefficients of a weighted theta series of the E8-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 E8-lattice is an 8-design. So, Lehmer's conjecture is reformulated in terms of spherical t-design. <br>Lehmer'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 Z2-lattice and the A2-lattice 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 Z2-lattice (resp. A2-lattice).
収録刊行物
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- Journal of the Mathematical Society of Japan
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Journal of the Mathematical Society of Japan 62 (3), 687-705, 2010
一般社団法人 日本数学会
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詳細情報 詳細情報について
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- CRID
- 1390282680092117504
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- NII論文ID
- 10027870742
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- NII書誌ID
- AA0070177X
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- ISSN
- 18811167
- 18812333
- 00255645
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- HANDLE
- 2324/27275
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- NDL書誌ID
- 10764013
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- 本文言語コード
- en
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