Wiggly cosmic strings accrete dark energy
| Autor: | José A. Jiménez Madrid, Pedro F. González-Díaz |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2005 |
| Předmět: |
Physics
Phantom energy Astrophysics (astro-ph) FOS: Physical sciences Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Invariant (physics) Astrophysics Cosmology Cosmic string Space and Planetary Science Quantum electrodynamics Energy density Dark energy Energy condition Quantum Mathematical Physics |
| Popis: | This paper deals with a study of the cylindrically symmetric accretion of dark energy with equation of state $p=w��$ onto wiggly straight cosmic strings. We have obtained that when $w>-1$ the linear energy density in the string core gradually increases tending to a finite maximum value as time increases for all considered dark energy models. On the regime where the dominant energy condition is violated all such models predict a steady decreasing of the linear energy density of the cosmic strings as phantom energy is being accreted. The final state of the string after such an accretion process is a wiggleless defect. It is argued however that if accreation of phantom energy would proceed by successive quantum steps then the defect would continue losing linear energy density until a minimum nonzero value which can be quite smaller than that corresponding to the unperturbed string. 6 pages, RevTex |
| Databáze: | OpenAIRE |
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