arXiv:hep-ph/0606070·v3·High Energy Physics — Phenomenology
Phenomenology of symmetry breaking from extra dimensions
J. Alfaro (1)🇨🇱 · A. Broncano (2)🇩🇪 · M.B. Gavela (3)🇪🇸 · S. Rigolin (3)🇪🇸 · M. Salvatori (3) ((1) Pontificia Universidad Catolica de Chile, (2) Max Planck Institute for Physics, Munich, (3) Universidad Autonoma de Madrid and IFT, Madrid)🇪🇸
Abstract
Motivated by the electroweak hierarchy problem, we consider theories with two extra dimensions in which the four-dimensional scalar fields are components of gauge boson in full space. We explore the Nielsen-Olesen instability for SU(N) on a torus, in the presence of a magnetic background. A field theory approach is developed, computing explicitly the minimum of the complete effective potential, including tri-linear and quartic couplings and determining the symmetries of the stable vacua. We also develop appropriate gauge-fixing terms when both Kaluza-Klein and Landau levels are present and interacting, discussing the interplay between the possible six and four dimensional choices. The equivalence between coordinate dependent and constant Scherk-Schwarz boundary conditions -associated to either continuous or discrete Wilson lines- is analyzed.
Comments: 39 pages and 8 eps figures. Few changes in section2