Tachyonic perturbations in AdS orbifolds
arXiv:hep-th/0409287 · doi:10.1103/PhysRevD.71.064022
Abstract
We show that scalar as well as vector and tensor metric perturbations in the Randall-Sundrum II braneworld allow normalizable tachyonic modes, i.e., possible instabilities. These instabilities require nonvanishing initial anisotropic stresses on the brane. We show with a specific example that within the Randall-Sundrum II model, even though the tachyonic modes are excited, no instability develops. We argue, however, that in the cosmological context instabilities might in principle be present. We conjecture that the tachyonic modes are due to the singularity of the orbifold construction. We illustrate this with a simple but explicit toy model.
11 pages, matches published version
References in corpus (23)
- A Large Mass Hierarchy from a Small Extra Dimension
- An Alternative to Compactification
- The Hierarchy Problem and New Dimensions at a Millimeter
- New Dimensions at a Millimeter to a Fermi and Superstrings at a TeV
- Dirichlet-Branes and Ramond-Ramond Charges
- Phenomenology, Astrophysics and Cosmology of Theories with Sub-Millimeter Dimensions and TeV Scale Quantum Gravity
- Heterotic and Type I String Dynamics from Eleven Dimensions
- Universal Aspects of Gravity Localized on Thick Branes
- Cosmology of One Extra Dimension with Localized Gravity
- New Experimental Limits on Macroscopic Forces Below 100 Microns
- Gravity, Stability and Energy Conservation on the Randall-Sundrum Brane-World
- Cosmological Solutions of Horava-Witten Theory
- Cosmological Perturbations in Brane-World Theories: Formalism
- Chandra measurements of the distribution of mass in the luminous lensing cluster Abell 2390
- Gauge-invariant gravitational perturbations of maximally symmetric spacetimes
- Cosmic Microwave Background Anisotropies from Scaling Seeds: Global Defect Models
- Lensing at cosmological scales: a test of higher dimensional gravity
- Perturbations of brane worlds
- Integro-differential equation for brane-world cosmological perturbations
- Cosmic vorticity on the brane
- Late time behavior of cosmological perturbations in a single brane model
- Localization of Scalar Fluctuations in a Dilatonic Brane-World Scenario
- Testing braneworlds with the binary pulsar
Cited by in corpus (6)
- Boundary Inflation and the WMAP Data
- Dynamical Casimir effect for gravitons in bouncing braneworlds
- On graviton production in braneworld cosmology
- Coupled boundary and bulk fields in anti-de Sitter
- Linearized Israel Matching Conditions for Cosmological Perturbations in a Moving Brane Background
- Graviton production in anti-de Sitter braneworld cosmology: A fully consistent treatment of the boundary condition