The Universe as a Cosmic String
arXiv:1410.0700 · doi:10.1103/PhysRevD.91.024002
Abstract
The cosmology of brane induced gravity in six infinite dimensions is investigated. It is shown that a brane with Friedmann-Robertson-Walker symmetries necessarily acts as a source of cylindrically symmetric gravitational waves, so called Einstein-Rosen waves. Their existence essentially distinguishes this model from its codimension-one counterpart and necessitates solving the nonlinear system of bulk and brane-matching equations. A numerical analysis is performed and two qualitatively different and dynamically separated classes of cosmologies are derived: degravitating solutions for which the Hubble parameter settles to zero despite the presence of a non-vanishing energy density on the brane and super-accelerating solutions for which Hubble grows unbounded. The parameter space of both the stable and unstable regime is derived and observational consequences are discussed: It is argued that the degravitating regime does not allow for a phenomenologically viable cosmology. On the other hand, the super-accelerating solutions are potentially viable, however, their unstable behavior questions their physical relevance.
26 pages, 17 figures. v2: references updated, typos corrected; matches version published in Physical Review D
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- Graviton Mass Bounds
- Fermionic Kaluza-Klein modes in the string-cigar braneworld
- Gravitational Mechanisms to Self-Tune the Cosmological Constant: Obstructions and Ways Forward
- Brane induced gravity: Ghosts and naturalness
- Radially stabilized inflating cosmic strings
- Generalised scalar-tensor theories and self-tuning
- Scattering and bound states of a spin--1/2 neutral particle in the cosmic string spacetime
- Cosmology on a cosmic ring
- Rotating kinky braneworlds