1999/06/30 by Hsin-Chia Cheng, Bogdan A. Dobrescu, Christopher T. Hill · 28 citations
Physics and Astronomy · Social Sciences · #Dark Matter and Cosmic Phenomena #Electroweak interaction #Extra dimensions #Gauge (firearms) #Gauge boson #Gauge symmetry #Gauge theory #Grand Unified Theory #Gravitation #International Science and Diplomacy #Particle physics theoretical and experimental studies #Standard Model (mathematical formulation) #String (physics) #hep-ph #hep-th
paper · pdf · doi:10.1016/s0550-3213(99)00816-0
published in Nuclear Physics B 573(3), 597-616 (Elsevier BV) · 25 pages, LaTex, 3 figures. References added
arxiv created 1999/07/08 · openalex publication_date 2000/05/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We study gauge coupling unification in the presence of extra dimensions compactified at a few TeV. Achieving unification requires a large number of gauge boson Kaluza-Klein excitations lighter than the string scale, such that the higher-dimensional gauge couplings are O(1) in string scale units. Corrections to the gauge couplings from two or more loops are about 10% or larger, hence string (or M) theory is generally expected to be strongly coupled in TeV-scale extra-dimensional scenarios. Higher-dimensional operators induced by quantum gravitational effects can shift the gauge couplings by a few percent. These effects are sufficiently large that even the minimal Standard Model, or the MSSM, allow unification at a scale in the TeV range. The strongly coupled unified theory may induce dynamical electroweak symmetry breaking.