Global Structure of Deffayet (Dvali-Gabadadze-Porrati) Cosmologies

Details Global Structure of Deffayet (Dvali-Gabadadze-Porrati) Cosmologies Global Structure of Deffayet (Dvali-Gabadadze-Porrati) Cosmologies

2002-08-23

arxiv.org/abs/hep-th/0208169v2

Phys.Rev. D67 (2003) 064004

Physics

High Energy Physics

High Energy Physics - Theory

15 pages, 4 figures, RevTeX. References added

Scientific paper

10.1103/PhysRevD.67.064004

We detail the global structure of the five-dimensional bulk for the cosmological evolution of Dvali-Gabadadze-Porrati braneworlds. The picture articulated here provides a framework and intuition for understanding how metric perturbations leave (and possibly reenter) the brane universe. A bulk observer sees the braneworld as a relativistically expanding bubble, viewed either from the interior (in the case of the Friedmann-Lemaitre-Robertson-Walker phase) or the exterior (the self-accelerating phase). Shortcuts through the bulk in the first phase can lead to an apparent brane causality violation and provide an opportunity for the evasion of the horizon problem found in conventional four-dimensional cosmologies. Features of the global geometry in the latter phase anticipate a depletion of power for linear metric perturbations on large scales.

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