English

Crossing the phantom divide without phantom matter

Astrophysics 2009-11-11 v1 General Relativity and Quantum Cosmology High Energy Physics - Theory

Abstract

A class of braneworld models can lead to phantom-like acceleration of the late universe, but without the need for any phantom matter. In the simplest models, the universe contains only cold dark matter and a cosmological constant. We generalize these models by introducing a quintessence field. The new feature in our models is that quintessence leads to a crossing of the phantom divide, w=1w=-1. This is a purely gravitational effect, and there is no phantom instability. Furthermore, the Hubble parameter is always decreasing, and there is no big rip singularity in the future.

Keywords

Cite

@article{arxiv.astro-ph/0605450,
  title  = {Crossing the phantom divide without phantom matter},
  author = {Luis P. Chimento and Ruth Lazkoz and Roy Maartens and Israel Quiros},
  journal= {arXiv preprint arXiv:astro-ph/0605450},
  year   = {2009}
}

Comments

5 pages, 5 figures, revtex4