The Structure of E6

Mathematics – Rings and Algebras

Scientific paper

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Ph. D. Dissertation. 204 pages, 37 figures; v2: fixed typos, restructured latex, added figures

Scientific paper

We present the subalgebra structure of sl(3,O), a particular real form of E6 chosen for its relevance to particle physics through the connection between its associated Lie group SL(3,O) and generalized Lorentz groups. Given the complications related to the non-associativity of the octonions O and the restriction to working with a real form of E6, we find that the traditional methods used to study Lie algebras must be modified for our purposes. We use an explicit representation of the Lie group SL(3,O) to produce the multiplication table of the corresponding algebra sl(3,O). Both the multiplication table and the group are then utilized to find subalgebras of sl(3,O). In particular, we identify various subalgebras of the form sl(n, F) and su(n, F) within sl(3,O) and we also find algebras corresponding to generalized Lorentz groups. Methods based upon automorphisms of complex Lie algebras are developed to find less obvious subalgebras of sl(3,O). While we focus on the subalgebra structure of our real form of E6, these methods may also be used to study the subalgebra structure of any other real form of E6. A maximal set of simultaneously measurable observables in physics corresponds to a maximal set of Casimir operators in the Lie algebra. We not only identify six Casimir operators in E6, but produce a nested sequence of subalgebras and Casimir operators in E6 containing both su(3)+su(2)+u(1) corresponding to the Standard Model and the Lorentz group of special relativity.

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