Brane-world cosmology with black strings

Research output: Contribution to journalArticle

59 Citations (Scopus)

Abstract

We consider the simplest scenario when black strings/cigars penetrate the cosmological brane. As a result, the brane has a Swiss-cheese structure, with Schwarzschild black holes immersed in a Friedmann-Lemaître-Robertson- Walker brane. There is no dark radiation in the model, the cosmological regions of the brane are characterized by a cosmological constant Λ and flat spatial sections. Regardless of the value of Λ, these brane-world universes forever expand and forever decelerate. The totality of source terms in the modified Einstein equation sum up to a dust, establishing a formal equivalence with the general relativistic Einstein-Straus model. However in this brane-world scenario with black strings the evolution of the cosmological fluid strongly depends on Λ. For Λ≤0 it has positive energy density ρ and negative pressure p and at late times it behaves as in the Einstein-Straus model. For (not too high) positive values of Λ the cosmological evolution begins with positive ρ and negative p, but this is followed by an epoch with both ρ and p positive. Eventually, ρ becomes negative, while p stays positive. A similar evolution is present for high positive values of Λ, however in this case the evolution ends in a pressure singularity, accompanied by a regular behavior of the cosmic acceleration. This is a novel type of singularity appearing in brane-worlds.

Original languageEnglish
Article number024002
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume74
Issue number2
DOIs
Publication statusPublished - 2006

Fingerprint

Brane World
Cosmology
Branes
cosmology
strings
Strings
Albert Einstein
Singularity
Decelerate
Scenarios
Einstein Equations
Modified Equations
Cosmological Constant
Einstein equations
guy wires
Source Terms
Energy Density
Expand
Black Holes
equivalence

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Nuclear and High Energy Physics
  • Mathematical Physics

Cite this

Brane-world cosmology with black strings. / Gergely, L.

In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 74, No. 2, 024002, 2006.

Research output: Contribution to journalArticle

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