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Crossing the Phantom Divide with K-essence in Brane-worlds by Chimento, Luis P.; Forte, Monica; Richarte, Martin G. is a scholarly article available to read on EtoBox.

What is Crossing the Phantom Divide with K-essence in Brane-worlds about?

We study a flat 3-brane in presence of a linear $k$ field with nonzero cosmological constant $\Lambda_{4}$. In this model the crossing of the phantom divide (PD) occurs when the $k$-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.

Author

Chimento, Luis P.; Forte, Monica; Richarte, Martin G.

Published

2009

Language

EN