Topological Defects in Contracting Universes
arXiv:astro-ph/0211066 · doi:10.1103/PhysRevLett.89.271301
Abstract
We study the behaviour and consequences of cosmic string networks in contracting universes. They approximately behave during the collapse phase as a radiation fluids. Scaling solutions describing this are derived and tested against high-resolution numerical simulations. A string network in a contracting universe, together with the gravitational radiation it generates, can affect the dynamics of the universe both locally and globally, and be an important source of radiation, entropy and inhomogeneity. We discuss possible implications for bouncing and cyclic models.
Shorter version of astro-ph/0206287. To appear in Phys. Rev. Lett
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- p-brane dynamics in N+1-dimensional FRW universes
- Physical and invariant models for defect network evolution
- Topological defects: A problem for cyclic universes?
- Trapping of Spin-0 fields on tube-like topological defects
- Adiabatic fluctuations from cosmic strings in a contracting universe