Dark Energy Fluid with Time-Dependent, Inhomogeneous Equation of State
I. Brevik, O. G. Gorbunova, A. V. Timoshkin
Abstract
The four-dimensional Friedman flat 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-periodic universe, which repeats the cycles of phantom-type space acceleration. The appearance of future singularities resulting from various choices for the input parameters is discussed.
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