Phantom Cosmology without Big Rip Singularity

Details Phantom Cosmology without Big Rip Singularity Phantom Cosmology without Big Rip Singularity

2012-01-19

arxiv.org/abs/1201.4056v2

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

LaTeX 13 pages, to appear in PLB

Scientific paper

We construct phantom energy models with the equation-of-state parameter $w$ such that $w<-1$, but finite-time future singularity does not occur. Such models can be divided into two classes: (i) energy density increases with time ("phantom energy" without "Big Rip" singularity) and (ii) energy density tends to constant value with time ("cosmological constant" with asymptotically de Sitter evolution). The disintegration of bound structure is confirmed in Little Rip cosmology. Surprisingly, we find that such disintegration (on example of Sun-Earth system) may occur even in asymptotically de Sitter phantom universe consistent with observational data. We also demonstrate that non-singular phantom models admit wormhole solutions as well as possibility of big trip via wormholes.

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