Symmetries, Integrable Systems and Representations

Volume 40 of the series Springer Proceedings in Mathematics & Statistics pp 319-344

A ℤ3-Orbifold Theory of Lattice Vertex Operator Algebra and ℤ3-Orbifold Constructions

  • Masahiko MiyamotoAffiliated withInstitute of Mathematics, University of Tsukuba

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For an even positive definite lattice L and its automorphism σ of order 3, we prove that a fixed point subVOA \(V_{L}^{\sigma}\) of a lattice VOA V L is C 2-cofinite. Using this result and the results in arXiv:​0909.​3665, we present ℤ3-orbifold constructions of holomorphic VOAs from lattice VOAs V Λ , where Λ are even unimodular positive definite lattices. One of them has the same character with the moonshine VOA V and another is a new VOA corresponding to No. 32 in Schellekens’ list (Theor. Mat. Fiz. 95(2), 348–360, 1993).