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Explicit constructions of unitary transformations between equivalent irreducible representations

机译:等效不可约表示之间unit变换的显式构造

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Irreducible representations (irreps) of a finite group G are equivalent if there exists a similarity transformation between them. In this paper, we describe an explicit algorithm for constructing this transformation between a pair of equivalent irreps, assuming that we are given an algorithm for computing the matrix elements of these irreps. Along the way, we derive a generalization of the classical orthogonality relations for matrix elements of irreps of finite groups. We give an explicit form of such unitary matrices for the important case of conjugated Young-Yamanouchi representations, when our group G is the symmetric group S(N).
机译:如果有限组G的不可约表示(irreps)之间存在相似变换,则它们是等效的。在本文中,假设给定了一种计算这些irrep的矩阵元素的算法,我们描述了一种在一对等效irrep之间构建此转换的显式算法。一路上,我们推导了有限群irrep矩阵元素的经典正交关系的推广。当我们的群G是对称群S(N)时,对于共轭Young-Yamanouchi表示的重要情况,我们给出了这种unit矩阵的显式形式。

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