2007/05/31 by C. Bogdanos, S. Nesseris, Savvas Nesseris +3 · 1 citation
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #astro-ph #hep-ph #hep-th
paper · pdf · doi:10.1103/physrevd.76.083514
published as Phys.Rev.D76:083514,2007 · 12 pages, 2 figures, added comments, references updated
arxiv created 2007/09/06 · openalex publication_date 2007/10/17 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We consider a braneworld model with bulk-brane energy exchange. This allows for crossing of the w=\ensuremath-1 phantom divide line without introducing phantom energy with quantum instabilities. We use the latest SnIa data included in the Gold06 data set to provide an estimate of the preferred parameter values of this braneworld model. We use three fitting approaches which provide best-fit parameter values and hint towards a bulk energy component that behaves like relativistic matter which is propagating in the bulk and is moving at a speed v along the fifth dimension, while the bulk-brane energy exchange component corresponds to negative pressure and signifies energy flowing from the bulk into the brane. We find that the best-fit effective equation of state parameter weff marginally crosses the phantom divide line w=\ensuremath-1. Thus, we have demonstrated both the ability of this class of braneworld models to provide crossing of the phantom divide and also that cosmological data hint towards natural values for the model parameters.