Eur. Phys. J. C (2007) 51: 179-183
https://doi.org/10.1140/epjc/s10052-007-0278-7

Regular Article - Theoretical Physics

Dark energy fluid with time-dependent, inhomogeneous equation of state

¹ Department of Energy and Process Engineering, Norwegian University of Science and Technology, Kolbj. Hejesv. 2, 7491, Trondheim, Norway
² Tomsk State Pedagogical University, Tomsk, Russia

^* e-mail: iver.h.brevik@ntnu.no

Received: 14 February 2007
Published online: 1 June 2007

Abstract

The four-dimensional flat Friedman universe filled with an ideal fluid with a linear (oscillating) inhomogeneous equation of state (EoS) depending on time is studied. The equations of motion are solved. It is shown that in some cases there appears a quasi-periodical universe that repeats the cycles of phantom-type space acceleration. The appearance of future singularities resulting from various choices for the input parameters is discussed.