Connected subgroups of SO(2,n) acting irreducibly on $\R^{2,n}$

Details Connected subgroups of SO(2,n) acting irreducibly on $\R^{2,n}$ Connected subgroups of SO(2,n) acting irreducibly on $\R^{2,n}$

2008-06-16

arxiv.org/abs/0806.2586v1

Mathematics

Differential Geometry

22 pages, no figures

Scientific paper

We classify all connected subgroups of SO(2,n) that act irreducibly on $\R^{2,n}$. Apart from $SO_0(2,n)$ itself these are $U(1,n/2)$, $SU(1,n/2)$, if $n$ even, $S^1\cdot SO(1,n/2)$ if $n$ even and $n\ge 2$, and $SO_0(1,2)$ for $n=3$. Our proof is based on the Karpelevich Theorem and uses the classification of totally geodesic submanifolds of complex hyperbolic space and of the Lie ball. As an application we obtain a list of possible irreducible holonomy groups of Lorentzian conformal structures, namely $SO_0(2,n)$, SU(1,n), and $SO_0(1,2)$.

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