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arXiv 0707.3189hep-thcond-mat.stat-mechmath-phmath.MP
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对数极小模型的融合代数

Fusion Algebras of Logarithmic Minimal Models

Jorgen Rasmussen, Paul A. Pearce

摘要:

我们给出了对数极小模型LM(p,p ')的手征融合代数的显式结构,其中考虑了Virasoro表示,不需要扩大或扩展对称代数.融合的生成器在数量上是可数无限的,但随后的融合规则是准理性的,在这个意义上,有限数量的表示的融合分解成有限的表示的直和。融合规则是可交换的,结合的,并表现出sl(2)结构,但需要所谓的Kac表示,其是秩1的可约但不可分解的表示。特别地,基本融合代数的恒等式一般是秩为1的可约但不可分解的Kac表示。我们详细比较了我们的融合规则与Gaberdiel和Kausch在p=1时的结果以及Eberle和Flohr在(p,p ')=(2,5)时的结果。在后一种情况下,我们确认的外观不可分解的表示秩3。我们还发现,一个基本的融合代数的封闭实现不引入秩高于3的不可分解表示。在我们的晶格方法中,相关的可积晶格模型的广泛的数值研究支持的约束融合规则。我们的晶格发现和数值结果的细节将在其他地方介绍。我们的融合规则与以前的融合规则的协议借给相当大的支持对数极小模型LM(p,p ')与代数定义的增广c_{p,p'}(极小)模型的识别。

英文摘要:

We present explicit conjectures for the chiral fusion algebras of the logarithmic minimal models LM(p,p') considering Virasoro representations with no enlarged or extended symmetry algebra. The generators of fusion are countably infinite in number but the ensuing fusion rules are quasi-rational in the sense that the fusion of a finite number of representations decomposes into a finite direct sum of representations. The fusion rules are commutative, associative and exhibit an sl(2) structure but require so-called Kac representations which are reducible yet indecomposable representations of rank 1. In particular, the identity of the fundamental fusion algebra is in general a reducible yet indecomposable Kac representation of rank 1. We make detailed comparisons of our fusion rules with the results of Gaberdiel and Kausch for p=1 and with Eberle and Flohr for (p,p')=(2,5) corresponding to the logarithmic Yang-Lee model. In the latter case, we confirm the appearance of indecomposable representations of rank 3. We also find that closure of a fundamental fusion algebra is achieved without the introduction of indecomposable representations of rank higher than 3. The conjectured fusion rules are supported, within our lattice approach, by extensive numerical studies of the associated integrable lattice models. Details of our lattice findings and numerical results will be presented elsewhere. The agreement of our fusion rules with the previous fusion rules lends considerable support for the identification of the logarithmic minimal models LM(p,p') with the augmented c_{p,p'} (minimal) models defined algebraically.

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