A unified approach to construction of Gelfand-Tsetlin-Zhelobenko base vectors for series $A$, $B$, $C$, $D$

Abstract

Using the Zhelobenko's approach we investigate a branching of an irreducible representation of $g_n$ under the restriction of algebras $g_n\downarrow g_{n-1}$, where $g_n$ is a Lie algebra of type $B_n$, $C_n$, $D_n$ or a Lie algebra of type $A$, where in this case we put $g_n={\mathfrak{gl}}_{n+1}$, $g_{n-1}={\mathfrak{gl}}_{n-1}$. We give a new explicit description of the space of the $g_{n-1}$-highest vectors, then we construct a base in this space. The case $n=2$ is considered separately for different algebras, but a passage from $n=2$ to an arbitrary $n$ is the same for all series $A$, $B$, $C$, $D$. This new procedure has the following advantage: it establishes a relation between spaces of $g_{n-1}$-highest vectors for different series of algebras. This procedure describes an extension of Gelfand-Tsetlin tableaux to the left.

The paper is completely revised, a comparision with Molev's base is removed

References in corpus (3)

• A Basis for Representations of Symplectic Lie Algebras
• Weight bases of Gelfand-Tsetlin type for representations of classical Lie algebras
• The comparison Gelfand-Tsetlin-Molev and Gelfand-Tsetlin-Zhelobenko bases for ${\mathfrak{sp}}_{2n}$

Cited by in corpus (1)

• The Gelfand-Tsetlin basis for infinite-dimensional representations of $g{l}_n(\mathbb{C})$