arXiv subjects

Hisanori Tsurusaki

Publications and source records attributed to Hisanori Tsurusaki.

2 recordsLinked to original sources

arXiv2023

Irreducible module decompositions of rank 2 symmetric hyperbolic Kac-Moody Lie algebras by $\mathfrak{sl}_2$ subalgebras which are generalizations of principal $\mathfrak{sl}_2$ subalgebras

There exist principal $\mathfrak{sl}_2$ subalgebras for hyperbolic Kac-Moody Lie algebras. In the case of rank 2 symmetric hyperbolic Kac-Moody Lie algebras, certain $\mathfrak{sl}_2$ subalgebras are constructed. These subalgebras are generalizations of principal $\mathfrak{sl}_2$ subalgebras. We show that the rank 2 symmetric hyperbolic Kac-Moody Lie algebras themselves are irreducibly decomposed under the action of this $\mathfrak{sl}_2$ subalgebras. Furthermore, we classify irreducible components of the decomposition. In particular, we obtain multiplicities of unitary principal series and complementary series.

math.RT↗

arXiv2021

$\mathfrak{sl}_2$ triples whose nilpositive elements are in a space which is spanned by the real root vectors in rank 2 symmetric hyperbolic Kac-Moody Lie algebras

In analogy to the theory of nilpotent orbit in finite-dimensional semisimple Lie algebras, it is known that the principal $\mathfrak{sl}_2$ subalgebras can be constructed in hyperbolic Kac-Moody Lie algebras. We obtained a series of $\mathfrak{sl}_2$ subalgebras in rank 2 symmetric hyperbolic Kac-Moody Lie algebras by extending the aforementioned construction. We present this result and also discuss $\mathfrak{sl}_2$ modules obtained by the action of the $\mathfrak{sl}_2$ subalgebras on the original Lie algebras.

math.RT↗