Exceptional simple Lie group...
[PLAIN]http://home.comcast.net/~lambo1826/physics/040_0001.jpg
E_8
Exceptional simple Lie group
1st, 2nd and 3rd matter generations triality symmetry - 248 dimensions
Slansky pg. 123 - ref. 1 said:
A major objection to E_7 and E_8 is that they have self-conjugate irreps (irreducible representations) only. So it appears to take a detailed analysis of the symmetry breaking to determine whether the flavor-chiral character of the weak interactions is recovered in the low energy limit. (example cited)
It is not clear at this time what requirements must be satisfied for a vector-like theory to reduce to the chiral weak-interaction theory at low energies.
Does Garrett Lisi's E_8 model break symmetry as this?:
E_8 \rightarrow SU(4) \times SU(2)_{L} \times SU(2)_R \rightarrow U(1) \times SU(2) \times SU(3)
Slansky - Table 15 - pg. 181 - ref. 1
E_8 \supset SO(16)
E_8 \supset SU(5) \times SU(5)
E_8 \supset SU(3) \times E_6
E_8 \supset SU(2) \times E_7
E_8 \supset SU(9)
E_8 \supset SU(2)
E_8 \supset G_2 \times F_4
E_8 \supset SU(2) \times SU(3)
E_8 \supset Sp_4
Arivero is correct that the Pati–Salam model can break symmetry from SO(10): (Slansky - Table 15 - pg. 178, SO(10) Wikipedia)
Rank 5:
SO(10) \rightarrow SU(4) \times SU(2)_{L} \times SU(2)_R
Slansky does not have the Pati–Salam model listed in table 15 as a subset of E_8, therefore I rely upon my colleagues to determine if this is a correct subset of E_8.
The closest solution I could locate from the Slansky tables is: (Slansky - Table 15 - pg. 181)
E_8 \supset SU(2) \times E_7
E_7 \supset SU(2) \times F_4
Therefore:
E_8 \rightarrow F_4 \times SU(2)_L \times SU(2)_R
Is this interpretation correct?
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Reference:
http://home.comcast.net/~lambo1826/physics/Slansky01.pdf"
http://en.wikipedia.org/wiki/Triality"
http://en.wikipedia.org/wiki/E8_%28mathematics%29"
http://en.wikipedia.org/wiki/SO(10)#Spontaneous_symmetry_breaking"
http://en.wikipedia.org/wiki/Einstein_field_equations"
http://en.wikipedia.org/wiki/Gauge_theory"
http://en.wikipedia.org/wiki/Standard_Model"
http://en.wikipedia.org/wiki/Pati%E2%80%93Salam_model"