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arXiv 1802.03575math-phmath.MP
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仿射Temperley-Lieb代数上的融合运算

On the computation of fusion over the affine Temperley-Lieb algebra

Jonathan Belletête, Yvan Saint-Aubin

摘要:

熔合积起源于共形场论中算子乘积展开的代数化。Read和Saleur(2007)引入了一个模在结合代数上的融合的模拟,例如那些出现在2d格模型的描述中的模。本文将他们的模定义推广到仿射Temperley-Lieb代数$\atl n$上。由于正则Temperley-Lieb代数$\tl n$是仿射$\atl n$的一个子代数,所以存在一对自然的伴随诱导-限制函子$(\Indar{}, \Resar{})$。代数态射$ϕ:\atl n\to\tl n$的存在提供了第二对伴随函子$(\Indphi{},\Resphi{})$。提出并研究了$\atl{}$ -模之间的两种融合积.它们用这四个函子表示。这些函子的作用是在标准、胞腔和不可约$\atl n$ -模上计算的。作为一个副产品,$\atl n(q+q^{-1})$的Peirce分解,当$q$不是一个单位根时,作为标准$\tl n$ -模到$\atl n$ -模的归纳$\Indar{\TheS{n,k}}$的直和给出。给出了各种仿射模对的融合积的例子。

英文摘要:

Fusion product originates in the algebraisation of the operator product expansion in conformal field theory. Read and Saleur (2007) introduced an analogue of fusion for modules over associative algebras, for example those appearing in the description of 2d lattice models. The article extends their definition for modules over the affine Temperley-Lieb algebra $\atl n$. Since the regular Temperley-Lieb algebra $\tl n$ is a subalgebra of the affine $\atl n$, there is a natural pair of adjoint induction-restriction functors $(\Indar{}, \Resar{})$. The existence of an algebra morphism $ϕ:\atl n\to\tl n$ provides a second pair of adjoint functors $(\Indphi{},\Resphi{})$. Two fusion products between $\atl{}$-modules are proposed and studied. They are expressed in terms of these four functors. The action of these functors is computed on the standard, cell and irreducible $\atl n$-modules. As a byproduct, the Peirce decomposition of $\atl n(q+q^{-1})$, when $q$ is not a root of unity, is given as direct sum of the induction $\Indar{\TheS{n,k}}$ of standard $\tl n$-modules to $\atl n$-modules. Examples of fusion products of various pairs of affine modules are given.

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