Field theory on multithroat backgrounds

Abstract

We consider extra dimensional field theory descriptions of backgrounds with N different throats where one of the extra dimensions in each throat is much larger than the others. Such backgrounds can be described by field theory on N 5D warped spaces which intersect on a ultraviolet (UV) brane. Given a field that propagates in all N throats there are N boundary conditions on the UV brane (which are determined by the effective Lagrangian on the UV brane) in addition to the boundary conditions on the N infrared branes. We derive a general set of UV boundary conditions and give examples of how they are applied to particular situations. Three simple example applications are given: in the first the number of families is determined by the number of throats and the SUSY flavor problem is solved via an S 3 symmetry of the throats; in the second we embed this scenario in a SUSY GUT with a solution of the doublet-triplet splitting problem based on the product group approach; while in the final example we show a simple geometric implementation of a SUSY trinification model on three throats.

Light neutrinos from a mini-seesaw mechanism in warped space

“…It would be interesting to investigate these ideas further to consider the viability of full three-family models and perform a detailed study of the bounds on, and phenomenology of, the light KK neutrinos. As a speculation, it may be possible to construct theories of flavor using these ideas, either by considering flavor structures for sterile neutrinos within the LWS or along the lines of [42]. We will investigate some of these matters in a future work.…”

New solutions to the hierarchy problem

“…Several possibilities have been considered in the literature to deal with this problem. For instance, negative S contributions might be induced by TeV localized kinetic terms [24], however there is always a constraining combination of S and T [25]. More recently, Ref.…”

Erratum to “Neutrinos in a sterile throat” [Nucl. Phys. B 768 (2007) 157–176]

“…For a multi-throat geometry [31], we splice together slices of AdS (with fifth-dimensional co-ordinates z, y, . .…”

“…3 This set-up is illustrated in Figure 1. Such a scenario of field theories in multiple AdS 5 throats has been recently explored in [30,31,32], in which multiple slices of AdS 5 In what follows, we perform a detailed analysis of the set-up illustrated in Figure 1. We are most interested in the particular scenario where the bulk sterile neutrino has an interaction with the Standard Model fields via a Yukawa-type interaction, localized on the UV brane, connecting the active neutrinos, the Higgs and the bulk sterile neutrino.…”