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arXiv 1707.07992math.RAmath.GRmath.OA
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码代数、轴代数和VOA

Code algebras, axial algebras and VOAs

Alonso Castillo-Ramirez, Justin McInroy, Felix Rehren

摘要:

受码顶点算子代数及其表示论的启发,我们定义了码代数,这是由二元线性码构造的一类新的交换非结合代数。令$C$是长度为$n$的二进制线性码。码代数$A_C$的基由$n$幂等元和用于$C$的每个非常数码字的向量组成。我们表明,代码代数几乎总是简单的,在温和的条件下,其结构常数,承认一个关联的双线性形式。我们确定了基中幂等元的Peirce分解和融合律,并给出了一个构造来寻找额外的幂等元,称为$s$ -映射,它来自代码结构。对于一般的码代数,我们分类的特征值和特征向量的最小的例子的$s$ -映射的建设,因此,某些代码代数是轴代数。我们给出了一些例子,包括一个汉明码$H_8$,其中代码代数$A_{H_8}$是一个轴代数,并嵌入到代码VOA $V_{H_8}$。

英文摘要:

Inspired by code vertex operator algebras (VOAs) and their representation theory, we define code algebras, a new class of commutative non-associative algebras constructed from binary linear codes. Let $C$ be a binary linear code of length $n$. A basis for the code algebra $A_C$ consists of $n$ idempotents and a vector for each non-constant codeword of $C$. We show that code algebras are almost always simple and, under mild conditions on their structure constants, admit an associating bilinear form. We determine the Peirce decomposition and the fusion law for the idempotents in the basis, and we give a construction to find additional idempotents, called the $s$-map, which comes from the code structure. For a general code algebra, we classify the eigenvalues and eigenvectors of the smallest examples of the $s$-map construction, and hence show that certain code algebras are axial algebras. We give some examples, including that for a Hamming code $H_8$ where the code algebra $A_{H_8}$ is an axial algebra and embeds in the code VOA $V_{H_8}$.

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