2007/05/29 by Gonzalo A. Palma
Physics and Astronomy · #Black Holes and Theoretical Physics #Brane #Brane cosmology #Classical mechanics #Cosmology and Gravitation Theories #Extra dimensions #Geometry #Gravitation #Graviton #Mathematical physics #Moduli space #Noncommutative and Quantum Gravity Theories #Observable #Orbifold #Physics #Quantum mechanics #Scalar (mathematics) #Scalar field #Spacetime #Superpotential #Supersymmetry #Theoretical physics #gr-qc #hep-ph #hep-th
paper · pdf · doi:10.1088/1126-6708/2007/09/091
published as JHEP 0709:091,2007 · 30 pages, 1 figure
arxiv created 2007/05/29 · openalex publication_date 2007/09/24 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
We study the propagation of gravitons within 5-D supersymmetric braneworld models with a bulk scalar field. The setup considered here consists of a 5-D bulk spacetime bounded by two 4-D branes localized at the fixed points of an S1/Z2 orbifold. There is a scalar field ϕ in the bulk which, provided a superpotential W(ϕ), determines the warped geometry of the 5-D spacetime. This type of scenario is common in string theory, where the bulk scalar field ϕ is related to the volume of small compact extra dimensions. We show that, after the moduli are stabilized by supersymmetry breaking terms localized on the branes, the only relevant degrees of freedom in the bulk consist of a 5-D massive spectrum of gravitons. Then we analyze the gravitational interaction between massive bodies localized at the positive tension brane mediated by these bulk gravitons. It is shown that the Newtonian potential describing this interaction picks up a non-trivial contribution at short distances that depends on the shape of the superpotential W(ϕ). We compute this contribution for dilatonic braneworld scenarios W(ϕ) = eαϕ (where α is a constant) and discuss the particular case of 5-D Heterotic M-theory: It is argued that a specific footprint at micron scales could be observable in the near future.