Crossing the phantom divide with k-essence in brane-worlds
arXiv:0909.0274 · doi:10.1142/S0217732310033797
Abstract
We study a flat 3-brane in presence of a linear field with nonzero cosmological constant . In this model the crossing of the phantom divide (PD) occurs when the -essence energy density becomes negative. We show that in the high energy regime the effective equation of state has a resemblance of a modified Chaplygin gas while in the low energy regime it becomes linear. We find a scale factor that begins from a singularity and evolves to a de Sitter stable stage while other solutions have a super-accelerated regime and end with a big rip. We use the energy conditions to show when the effective equation of state of the brane-universe crosses the PD.
8 pages, 5 figures. The article was fully rewritten. References added. Accepted for publication in MPLA (2010)
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