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arXiv 1103.3545math.RT
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Casimir算子的最大特征值与重数自由模自由模

Maximal eigenvalues of a Casimir operator and multiplicity-free modules

Gang Han

摘要:

设$\g$是有限维复半单李代数,$\b$是Borel子代数.则$\g$自然地作用于它的外代数$\w\g$。证明了$\w\g$上Casimir算子的最大特征值是$\g$维数的1/3,$\w^i\g$上Casimir算子的最大特征值$m_i$对$0\le i\le r$是递增的,其中$r$是正根的个数,并且相应的特征空间$M_i$是一个无重性的$\g$ -模,其最高权向量对应于$\b$的某些自幂零理想。我们还得到了一个结果,描述了一组重量的不可约表示的$\g$的最高重量的倍数$ρ$,其中$ρ$是一半的总和的正根。

英文摘要:

Let $\g$ be a finite-dimensional complex semisimple Lie algebra and $\b$ a Borel subalgebra. Then $\g$ acts on its exterior algebra $\w\g$ naturally. We prove that the maximal eigenvalue of the Casimir operator on $\w\g$ is one third of the dimension of $\g$, that the maximal eigenvalue $m_i$ of the Casimir operator on $\w^i\g$ is increasing for $0\le i\le r$, where $r$ is the number of positive roots, and that the corresponding eigenspace $M_i$ is a multiplicity-free $\g$-module whose highest weight vectors corresponding to certain ad-nilpotent ideals of $\b$. We also obtain a result describing the set of weights of the irreducible representation of $\g$ with highest weight a multiple of $ρ$, where $ρ$ is one half the sum of positive roots.

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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