Astrophysics and Space Science

, Volume 178, Issue 2, pp 303–309 | Cite as

Gravitational radiation from cosmic string splitting on a Friedmann-Robertson-Walker background

  • Reinaldo J. Gleiser
  • Andres D. Dagotto
  • Carlos O. Nicasio
Article
  • 33 Downloads

Abstract

We present exact solutions of Einstein's equations that may be interpreted as representing the splitting of a primordial cosmic string imbedded in a perfect fluid Friedmann-Robertson-Walker (FRW) cosmology. The splitting leads to the creation of a ‘bubble’ whose boundary is given by a gravitational shock wave, expanding from the point of splitting, associated to the motion of the free ends of the string. Inside the bubble we have a perturbed FRW metric. This perturbation is largest near the string ends, producing a sort of ‘wake’ along the path of the free ends, but decreases rapidly with time and the metric approaches the FRW regime locally everywhere inside the bubble. Similar results are shown to hold also for flat vacuum de Sitter space-times.

Keywords

Radiation Shock Wave Exact Solution Perfect Fluid Cosmic String 

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Copyright information

© Kluwer Academic Publishers 1991

Authors and Affiliations

  • Reinaldo J. Gleiser
    • 1
  • Andres D. Dagotto
    • 1
  • Carlos O. Nicasio
    • 1
  1. 1.Facultad de Matemática, Astronomía y FísicaUniversidad Nacional de CórdobaArgentina

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