New dimensions at a millimeter to a fermi and superstrings at a TeV
Abstract
Recently, a new framework for solving the hierarchy problem has been proposed which does not rely on low energy supersymmetry or technicolor. The gravitational and gauge interactions unite at the electroweak scale, and the observed weakness of gravity at long distances is due the existence of large new spatial dimensions. In this letter, we show that this framework can be embedded in string theory. These models have a perturbative description in the context of type I string theory. The gravitational sector consists of closed strings propagating in the higherdimensional bulk, while ordinary matter consists of open strings living on D3branes. This scenario raises the exciting possibility that the LHC and NLC will experimentally study ordinary aspects of string physics such as the production of narrow Reggeexcitations of all standard model particles, as well more exotic phenomena involving strong gravity such as the production of black holes. The new dimensions can be probed by events with large missing energy carried off by gravitons escaping into the bulk. We finally discuss some important issues of model building, such as proton stability, gauge coupling unification and supersymmetry breaking.
 Publication:

Physics Letters B
 Pub Date:
 September 1998
 DOI:
 10.1016/S03702693(98)008600
 arXiv:
 arXiv:hepph/9804398
 Bibcode:
 1998PhLB..436..257A
 Keywords:

 High Energy Physics  Phenomenology;
 High Energy Physics  Theory
 EPrint:
 12 pages, latex