Gibbs isotherm
Finite | |
---|---|
E3=A2A1 | Template:Dynkin2 |
E4=A4 | Template:Dynkin2 |
E5=D5 | Template:Dynkin2 |
E6 | Template:Dynkin2 |
E7 | Template:Dynkin2 |
E8 | Template:Dynkin2 |
Affine (Extended) | |
E9 or E8(1) or E8+ | Template:Dynkin2 |
Hyperbolic (Over-extended) | |
E10 or E8(1)^ or E8++ | Template:Dynkin2 |
Lorentzian (Very-extended) | |
E11 or E8+++ | Template:Dynkin2 |
Kac–Moody | |
E12 or E8++++ | Template:Dynkin2 |
... |
In mathematics, especially in Lie theory, En is the Kac–Moody algebra whose Dynkin diagram is a bifurcating graph with three branches of length 1,2, and k, with k=n-4.
In some older books and papers, E2 and E4 are used as names for G2 and F4.
Finite dimensional Lie algebras
The En group is similar to the An group, except the nth node is connected to the 3rd node. So the Cartan matrix appears similar, -1 above and below the diagonal, except for the last row and column, have -1 in the third row and column. The determinant of the Cartan matrix for En is 9-n.
- E3 is another name for the Lie algebra A1A2 of dimension 11, with Cartan determinant 6.
- E4 is another name for the Lie algebra A4 of dimension 24, with Cartan determinant 5.
- E5 is another name for the Lie algebra D5 of dimension 45, with Cartan determinant 4.
- E6 is the exceptional Lie algebra of dimension 78, with Cartan determinant 3.
- E7 is the exceptional Lie algebra of dimension 133, with Cartan determinant 2.
- E8 is the exceptional Lie algebra of dimension 248, with Cartan determinant 1.
Infinite dimensional Lie algebras
- E9 is another name for the infinite dimensional affine Lie algebra (also as E8+ or E8(1) as a (one-node) extended E8) (or E8 lattice) corresponding to the Lie algebra of type E8. E9 has a Cartan matrix with determinant 0.
- E10 (or E8++ or E8(1)^ as a (two-node) over-extended E8) is an infinite dimensional Kac–Moody algebra whose root lattice is the even Lorentzian unimodular lattice II9,1 of dimension 10. Some of its root multiplicities have been calculated; for small roots the multiplicities seem to be well behaved, but for larger roots the observed patterns break down. E10 has a Cartan matrix with determinant -1:
- E11 (or E8+++ as a (three-node) very-extended E8) is a Lorentzian algebra, containining one time-like imaginary dimension, that has been conjectured to generate the symmetry "group" of M-theory.
- En for n≥12 is an infinite dimensional Kac–Moody algebra that has not been studied much.
Root lattice
The root lattice of En has determinant 9−n, and can be constructed as the lattice of vectors in the unimodular Lorentzian lattice Zn,1 that are orthogonal to the vector (1,1,1,1,....,1|3) of norm n×12 − 32 = n − 9.
E7½
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Landsberg and Manivel extended the definition of En for integer n to include the case n = 7½. They did this in order to fill the "hole" in dimension formulae for representations of the En series which was observed by Cvitanovic, Deligne, Cohen and de Man. E7½ has dimension 190, but is not a simple Lie algebra: it contains a 57 dimensional Heisenberg algebra as its nilradical.
See also
References
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- Landsberg, J. M. Manivel, L. The sextonions and E7½. Adv. Math. 201 (2006), no. 1, 143-179.
- Connections between Kac-Moody algebras and M-theory, Paul P. Cook, 2006 [1]
- A class of Lorentzian Kac-Moody algebras, Matthias R. Gaberdiel, David I. Olive and Peter C. West, 2002[2]