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arXiv 0905.0094math.RTmath.QA
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$GL_{mn}(\C)$-模限制到$GL_m(\C) \times GL_n(\C)$的量子形变

Quantum deformations of the restriction of $GL_{mn}(\C)$-modules to $GL_m(\C) \times GL_n(\C)$

B. Adsul, M. Sohoni, K. V. Subrahmanyam

摘要:

本文考虑有限维$GL_{mn} (\C)$-模对子群${GL_m (\C)\times GL_n (\C)}$的限制.特别地,对于$U_q(gl_{mn})$的Weyl模$V_λ (\C^{mn})$,我们构造$U_q (gl_m)\otimes U_q (gl_n)$的表示$W_λ$,使得在$q=1$处,$V_λ (\C^{mn})$对$U_1 (gl_m)\otimes U_1 (gl_n)$的限制与其在$q=1$处对$W_λ$的作用相匹配。因此,$W_λ$是模块$V_λ$的$q$-变形。这是通过首先构造一个$U_q (gl_m)\otimes U_q (gl_n)$-模块$\wedge^k $,一个$q$-简单$GL_{mn} (\C)$-模块$\wedge^k (\C^{mn})$的变形来实现的.我们还构建了$\wedge^k $的双晶基础,并表明它由有符号的子集。接下来,我们开发$U_q (gl_m) \otimes U_q (gl_n)$-等变映射$ψ_{a,b} :\wedge^{a+1} \otimes \wedge^{b-1} \to \wedge^a \otimes \wedge^b$。它被用作构建通用$W_λ$的构建块。

英文摘要:

In this paper, we consider the restriction of finite dimensional $GL_{mn} (\C)$-modules to the subgroup ${GL_m (\C)\times GL_n (\C)}$. In particular, for a Weyl module $V_λ (\C^{mn})$ of $U_q(gl_{mn})$ we construct a representation $W_λ$ of $U_q (gl_m)\otimes U_q (gl_n)$ such that at $q=1$, the restriction of $V_λ (\C^{mn})$ to $U_1 (gl_m)\otimes U_1 (gl_n)$ matches its action on $W_λ$ at $q=1$. Thus $W_λ$ is a $q$-deformation of the module $V_λ$. This is achieved by first constructing a $U_q (gl_m)\otimes U_q (gl_n)$-module $\wedge^k $, a $q$-deformation of the simple $GL_{mn} (\C)$-module $\wedge^k (\C^{mn})$. We also construct the bi-crystal basis for $\wedge^k $ and show that it consists of signed subsets. Next, we develop $U_q (gl_m) \otimes U_q (gl_n)$-equivariant maps $ψ_{a,b} :\wedge^{a+1} \otimes \wedge^{b-1} \to \wedge^a \otimes \wedge^b$. This is used as the building block to construct the general $W_λ$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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