2009/02/28 by Susha Parameswaran, S. L. Parameswaran, S. Randjbar-Daemi +3
Physics and Astronomy · #Black Holes and Theoretical Physics #Brane #Brane cosmology #Compactification (mathematics) #Cosmology and Gravitation Theories #Dilaton #Extra dimensions #Gauge theory #Kaluza–Klein theory #Mathematical physics #Multiplet #Noncommutative and Quantum Gravity Theories #Physics #Quantum mechanics #Spectral line #Supergravity #Supersymmetry #Theoretical physics #hep-ph #hep-th
paper · pdf · doi:10.1088/1126-6708/2009/03/136
published as JHEP 0903:136,2009 · 36 pages + appendices, 2 figures, 2 tables. v2: typos corrected, matches published version
openalex publication_date 2009/03/27 · arxiv created 2009/04/03 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Our main objective is to study how braneworld models of higher codimension differ from the 5D case and traditional Kaluza-Klein compactifications. We first derive the classical dynamics describing the physical fluctuations in a wide class of models incorporating gravity, non-Abelian gauge fields, the dilaton and two-form potential, as well as 3-brane sources. Next, we use these results to study braneworld compactifications in 6D supergravity, focusing on the bosonic fields in the minimal model; composed of the supergravity-tensor multiplet and the U(1) gauge multiplet whose flux supports the compactification. For unwarped models sourced by positive tension branes, a harmonic analysis allows us to solve the large, coupled, differential system completely and obtain the full 4D spin-2,1 and 0 particle spectra, establishing (marginal) stability and a qualitative behaviour similar to the smooth sphere compactification. We also find interesting results for models with negative tension branes; extra massless Kaluza-Klein vector fields can appear in the spectra, beyond those expected from the isometries in the internal space. These fields imply an enhanced gauge symmetry in the low energy 4D effective theory obtained by truncating to the massless sector, which is explicitly broken as higher modes are excited, until the full 6D symmetries are restored far above the Kaluza-Klein scale. Remarkably, the low energy effective theory does not seem to distinguish between a compactification on a smooth sphere and these singular, deformed spheres.