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<p>We propose a novel approach to study hyperbolic Kac-Moody algebras, and more specifically, the Feingold-Frenkel algebra 𝔉, which is based on considering the tensor algebra of level-one states before descending to the Lie algebra by converting tensor products into multiple commutators. This method enables us to exploit the presence of mutually commuting coset Virasoro algebras, whose number grows without bound with increasing affine level. We present the complete decomposition of the tensor algebra under the affine and coset Virasoro symmetries for all levels <i>ℓ</i> ≤ 5, as well as the maximal tensor ground states from which all elements of 𝔉 up to level five can be (redundantly) generated by the joint action of the affine and coset Virasoro generators, and subsequent conversion to multi-commutators, which are then expressed in terms of transversal and longitudinal DDF states. We comment on the deep relations between the algebra 𝔉 and Einstein gravity in four space-time dimensions, and outline novel directions for future work.</p>

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From tensor algebras to hyperbolic Kac-Moody algebras

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年12月16日

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  • Axel Kleinschmidt,
  • Hannes Malcha,
  • Hermann Nicolai

摘要

We propose a novel approach to study hyperbolic Kac-Moody algebras, and more specifically, the Feingold-Frenkel algebra 𝔉, which is based on considering the tensor algebra of level-one states before descending to the Lie algebra by converting tensor products into multiple commutators. This method enables us to exploit the presence of mutually commuting coset Virasoro algebras, whose number grows without bound with increasing affine level. We present the complete decomposition of the tensor algebra under the affine and coset Virasoro symmetries for all levels ℓ ≤ 5, as well as the maximal tensor ground states from which all elements of 𝔉 up to level five can be (redundantly) generated by the joint action of the affine and coset Virasoro generators, and subsequent conversion to multi-commutators, which are then expressed in terms of transversal and longitudinal DDF states. We comment on the deep relations between the algebra 𝔉 and Einstein gravity in four space-time dimensions, and outline novel directions for future work.