E7 groups from octonionic magic square

Details E7 groups from octonionic magic square E7 groups from octonionic magic square

2010-07-27

arxiv.org/abs/1007.4758v2

Physics

Mathematical Physics

23 pages, added sections with new constructions

Scientific paper

In this paper we continue our program, started in [2], of building up explicit generalized Euler angle parameterizations for all exceptional compact Lie groups. Here we solve the problem for E7, by first providing explicit matrix realizations of the Tits construction of a Magic Square product between the exceptional octonionic algebra J and the quaternionic algebra H, both in the adjoint and the 56 dimensional representations. Then, we provide the Euler parametrization of E7 starting from its maximal subgroup U=(E6 x U(1))/Z3. Next, we give the constructions for all the other maximal compact subgroups.

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