Hyperbolic Kac-Moody Algebras and Chaos in Kaluza-Klein Models

Details Hyperbolic Kac-Moody Algebras and Chaos in Kaluza-Klein Models Hyperbolic Kac-Moody Algebras and Chaos in Kaluza-Klein Models

2001-03-13

arxiv.org/abs/hep-th/0103094v1

Phys.Lett. B509 (2001) 323-330

Physics

High Energy Physics

High Energy Physics - Theory

13 pages, 1 figure

Scientific paper

10.1016/S0370-2693(01)00498-1

Some time ago, it was found that the never-ending oscillatory chaotic behaviour discovered by Belinsky, Khalatnikov and Lifshitz (BKL) for the generic solution of the vacuum Einstein equations in the vicinity of a spacelike ("cosmological") singularity disappears in spacetime dimensions $D= d+1>10$. Recently, a study of the generalization of the BKL chaotic behaviour to the superstring effective Lagrangians has revealed that this chaos is rooted in the structure of the fundamental Weyl chamber of some underlying hyperbolic Kac-Moody algebra. In this letter, we show that the same connection applies to pure gravity in any spacetime dimension $\geq 4$, where the relevant algebras are $AE_d$. In this way the disappearance of chaos in pure gravity models in $D > 10$ dimensions becomes linked to the fact that the Kac-Moody algebras $AE_d$ are no longer hyperbolic for $d > 9$.

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