Abstract
Use of the AdS/CFT correspondence to arrive at phenomenological gauge field theories is dicussed, focusing on the orbifolded case without supersymmetry. An abelian orbifold with the finite group
Z
p
can give rise to a
G=SU(N
)
p
gauge group with chiral fermions and complex scalars in different bi-fundamental representations of
G
. The precision measurements at the
Z
resonance suggest the values
p=12
and
N=3
, and a unifications scale
M
U
∼4
TeV. Robustness and predictivity of such grand unification is discussed.