Issue
EPL
Volume 82, Number 4, May 2008
Article Number 49001
Number of page(s) 6
Section Geophysics, Astronomy and Astrophysics
DOI http://dx.doi.org/10.1209/0295-5075/82/49001
Published online 07 May 2008
EPL, 82 (2008) 49001
DOI: 10.1209/0295-5075/82/49001

Crossing of the phantom divided barrier with Lorentz invariance violating fields

S. D. Sadatian and K. Nozari

Department of Physics, Faculty of Basic Sciences, University of Mazandaran - P.O. Box 47416-1467, Babolsar, Iran

d.sadatian@umz.ac.ir
knozari@umz.ac.ir

received 2 February 2008; accepted in final form 29 March 2008; published May 2008
published online 7 May 2008

Abstract
We study the possible crossing of the phantom divided barrier in a Lorentz invariance violating dark-energy model. Lorentz invariance violation, which is achieved by introducing a vector field in the action, incorporates directly in the dynamics of the scalar field and equation of state. This interesting feature allows us to study phantom divided barrier crossing in the context of Lorentz invariance violation. We show that for a suitable choice of the parameter space, the equation of state can cross the phantom divided barrier just by one scalar field and a Lorentz violating vector field controls this crossing.

PACS
95.36.+x - Dark energy.
98.80.Cq - Particle-theory and field-theory models of the early Universe (including cosmic pancakes, cosmic strings, chaotic phenomena, inflationary universe, etc.).
98.80.-k - Cosmology.

© EPLA 2008