Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1993-09-13
Phys.Rev. D49 (1994) 4902-4907
Physics
High Energy Physics
High Energy Physics - Phenomenology
LaTeX, 12 pages, FERMILAB-PUB-93/262-T
Scientific paper
10.1103/PhysRevD.49.4902
We explore the possibility of unification of gauge couplings near the Planck scale in models of extended technicolor. We observe that models of the form G X SU(3)_c X SU(2)_L X U(1)_Y cannot be realized, due to the presence of massless neutral Goldstone bosons (axions) and light charged pseudo-Goldstone bosons; thus, unification of the known forces near the Planck scale cannot be achieved. The next simplest possibility, G X SU(4)_{PS} X SU(2)_L X U(1)_{T_{3R}}, cannot lead to unification of the Pati-Salam and weak gauge groups near the Planck scale. However, superstring theory provides relations between couplings at the Planck scale without the need for an underlying grand-unified gauge group, which allows unification of the SU(4)$_{PS}$ and SU(2)$_L$ couplings.
Lykken Joseph D.
Willenbrock Scott
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