Journal of Lie Theory

no. 1
Some Transitive Linear Actions of Real Simple Lie Groups
Journal of Lie Theory, Volume 22 (2012) no. 1, pp. 155-161
\def\C{{\mathbb{C}}} \def\H{{\mathbb{H}}} \def\R{{\mathbb{R}}} In a recent paper of M. Moskowitz and R. Sacksteder [An extension of the Minkowski-Hlawka theorem, Mathematika 56 (2010) 203-216], essential use was made of the fact that in its natural linear action the real symplectic group, Sp$(n,\R)$, acts transitively on $\R^{2n}\setminus\{0\}$ (similarly for the theorem of Hlawka itself, SL$(n,\R)$ acts transitively on $\R^n\setminus\{0\}$). This raises the natural question as to whether there are {\it proper connected} Lie subgroups of either of these groups which also act transitively on $\R^{2n}\setminus\{0\}$, (resp. $\R^n\setminus\{0\}$). Here we determine all the minimal ones. These are Sp$(n,\R)\subseteq {\rm SL}(2n,\R)$ and SL$(n,\C) \subseteq{\rm SL}(2n,\R)$ acting on $\R^{2n}\setminus \{0\}$; on $\R^{4n}\setminus \{0\}$, they are Sp$(2n,\R)\subseteq{\rm SL}(4n,\R)$ and SL$(n,\H) (={\rm SU}^*(2n)) \subseteq{\rm SL}(4n,\R)$.
DOI: 10.5802/jolt.664
Classification: 22E46, 22F30, 54H15, 57S15
Keywords: Transitive linear action, reductive group, actions of compact groups on spheres, special linear and real symplectic groups 
@article{JOLT_2012_22_1_a5,
     author = {L. Geatti and M. Moskowitz},
     title = {Some {Transitive} {Linear} {Actions} of {Real} {Simple} {Lie} {Groups}},
     journal = {Journal of Lie Theory},
     pages = {155--161},
     year = {2012},
     volume = {22},
     number = {1},
     doi = {10.5802/jolt.664},
     zbl = {1241.22017},
     url = {https://jolt.centre-mersenne.org/articles/10.5802/jolt.664/}
}
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L. Geatti; M. Moskowitz. Some Transitive Linear Actions of Real Simple Lie Groups. Journal of Lie Theory, Volume 22 (2012) no. 1, pp. 155-161. doi: 10.5802/jolt.664

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