An infinite-rank Lie algebra associated to SL$(2,\mathbb R)$ and SL$(2,\mathbb R)/U(1)$
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arXiv
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| Format: | Preprint |
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2024
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| author | Campoamor-Stursberg, Rutwig Marrani, Alessio de Traubenberg, Michel Rausch |
| author_facet | Campoamor-Stursberg, Rutwig Marrani, Alessio de Traubenberg, Michel Rausch |
| contents | We construct a generalised notion of Kac-Moody algebras using smooth maps from the non-compact manifolds ${\cal M}=$SL$(2,\mathbb R)$ and ${\cal M}=$ SL$(2,\mathbb R)/U(1)$ to a finite-dimensional simple Lie group $G$. This construction is achieved through two equivalent ways: by means of the Plancherel Theorem and by identifying a Hilbert basis within $L^2(\mathcal{M})$. We analyse the existence of central extensions and identify those in duality with Hermitean operators on $\cal M$. By inspecting the Clebsch-Gordan coefficients of $\mathfrak{sl}(2,\mathbb{R})$, we derive the Lie brackets characterising the corresponding generalised Kac-Moody algebras. The root structure of these algebras is identified, and it is shown that an infinite number of simultaneously commuting operators can be defined. Furthermore, we briefly touch upon applications of these algebras within the realm of supergravity, particularly in scenarios where the scalar fields coordinatize the non-compact manifold $\text{SL}(2,\mathbb{R})/U(1)$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_09845 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | An infinite-rank Lie algebra associated to SL$(2,\mathbb R)$ and SL$(2,\mathbb R)/U(1)$ Campoamor-Stursberg, Rutwig Marrani, Alessio de Traubenberg, Michel Rausch Mathematical Physics High Energy Physics - Theory Representation Theory We construct a generalised notion of Kac-Moody algebras using smooth maps from the non-compact manifolds ${\cal M}=$SL$(2,\mathbb R)$ and ${\cal M}=$ SL$(2,\mathbb R)/U(1)$ to a finite-dimensional simple Lie group $G$. This construction is achieved through two equivalent ways: by means of the Plancherel Theorem and by identifying a Hilbert basis within $L^2(\mathcal{M})$. We analyse the existence of central extensions and identify those in duality with Hermitean operators on $\cal M$. By inspecting the Clebsch-Gordan coefficients of $\mathfrak{sl}(2,\mathbb{R})$, we derive the Lie brackets characterising the corresponding generalised Kac-Moody algebras. The root structure of these algebras is identified, and it is shown that an infinite number of simultaneously commuting operators can be defined. Furthermore, we briefly touch upon applications of these algebras within the realm of supergravity, particularly in scenarios where the scalar fields coordinatize the non-compact manifold $\text{SL}(2,\mathbb{R})/U(1)$. |
| title | An infinite-rank Lie algebra associated to SL$(2,\mathbb R)$ and SL$(2,\mathbb R)/U(1)$ |
| topic | Mathematical Physics High Energy Physics - Theory Representation Theory |
| url | https://arxiv.org/abs/2406.09845 |