General Relativity and Gravitation

, Volume 45, Issue 4, pp 819–844

Gravitational collapse with tachyon field and barotropic fluid

  • Yaser Tavakoli
  • João Marto
  • Amir Hadi Ziaie
  • Paulo Vargas Moniz
Research Article

DOI: 10.1007/s10714-013-1503-3

Cite this article as:
Tavakoli, Y., Marto, J., Ziaie, A.H. et al. Gen Relativ Gravit (2013) 45: 819. doi:10.1007/s10714-013-1503-3

Abstract

A particular class of space-time, with a tachyon field, \(\phi \), and a barotropic fluid constituting the matter content, is considered herein as a model for gravitational collapse. For simplicity, the tachyon potential is assumed to be of inverse square form i.e., \(V(\phi )\sim \phi ^{-2}\). Our purpose, by making use of the specific kinematical features of the tachyon, which are rather different from a standard scalar field, is to establish the several types of asymptotic behavior that our matter content induces. Employing a dynamical system analysis, complemented by a thorough numerical study, we find classical solutions corresponding to a naked singularity or a black hole formation. In particular, there is a subset where the fluid and tachyon participate in an interesting tracking behaviour, depending sensitively on the initial conditions for the energy densities of the tachyon field and barotropic fluid. Two other classes of solutions are present, corresponding respectively, to either a tachyon or a barotropic fluid regime. Which of these emerges as dominant, will depend on the choice of the barotropic parameter, \(\gamma \). Furthermore, these collapsing scenarios both have as final state the formation of a black hole.

Keywords

Gravitational collapse Singularities Tachyon field 

Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • Yaser Tavakoli
    • 1
  • João Marto
    • 1
  • Amir Hadi Ziaie
    • 2
  • Paulo Vargas Moniz
    • 1
    • 3
  1. 1.Departamento de FísicaUniversidade da Beira InteriorCovilhãPortugal
  2. 2.Department of PhysicsShahid Beheshti UniversityTehranIran
  3. 3.CENTRA, ISTLisbonPortugal

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