5 research outputs found
Dark Energy Fluid with Time-Dependent, Inhomogeneous Equation of State
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.Comment: 9 pages pdf, 4 figures. To appear in European Physical Journal