Crossing of the phantom divided barrier with Lorentz invariance violating fieldsS. D. Sadatian and K. Nozari
Department of Physics, Faculty of Basic Sciences, University of Mazandaran - P.O. Box 47416-1467, Babolsar, Iran
received 2 February 2008; accepted in final form 29 March 2008; published May 2008
published online 7 May 2008
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.
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