Orbit types of the compact Lie group E_7 in the complex Freudenthal vector space P^C

Details Orbit types of the compact Lie group E_7 in the complex Freudenthal vector space P^C Orbit types of the compact Lie group E_7 in the complex Freudenthal vector space P^C

2010-11-02

arxiv.org/abs/1011.0613v1

Tsukuba J. Math. 23(1999), 229-234

Mathematics

Differential Geometry

6pages, http://web.me.com/coolkai/YSTM/YSTM/YSTM.html

Scientific paper

Let J be the exceptional Jordan algebra over R and J^C its complexification. Then the simply connected compact exceptional Lie group F_4 acts on J and F_4 has three orbit types which are F_4/F_4, F_4/Spin(9), F_4/Spin(8). Similarly the simply connected compact exceptional Lie group E_6 acts on J^C and E_6 has five orbit types which are E_6/E_6, E_6/F_4, E_6/Spin(10), E_6/Spin(9), E_6/Spin(8) . In this paper, we determine the orbit types of the simply connected compact exceptional Lie group E_7 in the complex Freudenthal vector space P^C. As results, E_7 has seven orbit types which are E_7/E_7, E_7/E_6, E_7/F_4, E_7/Spin(11), E_7/Spin(10), E_7/Spin(9), E_7/Spin(8).

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