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Paper   IPM / Astronomy / 12882
School of Astronomy
  Title:   The spherical perfect fluid collapse in the cosmological background
1.  Rahim Moradi
2.  Javad Taghizadeh Firouzjaee
3.  Reza Mansouri
  Status:   Published
  Journal: Modern Physics D
  Vol.:  21
  Year:  2012
  Supported by:  IPM
We have constructed a spherically symmetric structure model within an otherwise FRW universe filled with perfect fluid and studied its quasi-local characteristics. This is done by using the Lemaître solution of the Einstein equations and by suggesting an algorithm to integrate it numerically. The result shows how a dynamical black hole evolves within the FRW universe, its decoupling from the expanding parts of the model, the structure of its space-like apparent horizon, the limiting case of the dynamical horizon tending to a slowly evolving horizon, and the decreasing mass in-fall to the black hole. The quasi-local features of this cosmological black hole may not be inferred from the Newtonian approximation although the gravity outside the structure is very weak.

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