Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1999-08-21
Physics
High Energy Physics
High Energy Physics - Theory
21 pages, 6 figures
Scientific paper
In theories with TeV string scale and sub-millimeter extra dimensions the attractive picture of logarithmic gauge coupling unification at $10^{16}$ GeV is seemingly destroyed. In this paper we argue to the contrary that logarithmic unification {\it can} occur in such theories. The rationale for unification is no longer that a gauge symmetry is restored at short distances, but rather that a geometric symmetry is restored at large distances in the bulk away from our 3-brane. The apparent `running' of the gauge couplings to energies far above the string scale actually arises from the logarithmic variation of classical fields in (sets of) two large transverse dimensions. We present a number of N=2 and N=1 supersymmetric D-brane constructions illustrating this picture for unification.
Arkani-Hamed Nima
Dimopoulos Savas
March-Russell John
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