Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1994-01-12
Phys.Lett. B341 (1994) 31-37
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages (LaTeX)
Scientific paper
10.1016/0370-2693(94)01275-X
We study the unification scale and gauge coupling constant in 4D string
theory. We show that the fine structure constant is determined by the dimension
of the hidden gauge group and only $SU(6)$ and $SO(9)$ are consistent with
minimal string unification while the unification scale can be of order of
$10^{16}\,GeV$.
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