Role of deceleration parameter and interacting dark energy in singularity avoidance. (English) Zbl 1209.83046
Summary: A class of non-singular bouncing FRW models are obtained by constraining the deceleration parameter in the presence of an interacting dark energy represented by a time-varying cosmological constant. The models being geometrically closed, initially accelerate for a certain period of time and decelerate thereafter and are also free from the entropy and cosmological constant problems. Taking a constant of integration equal to zero one particular model is discussed in some detail and the variation of different cosmological parameters are shown graphically for specific values of the parameters of the model. For some specific choice of the parameters of the model the ever expanding models of Ozer & Taha and Abdel-Rahman and the decelerating models of Berman and also the Einstein de-Sitter model may be obtained as special cases of this particular model.
MSC:
| 83F05 | Relativistic cosmology |
| 83C75 | Space-time singularities, cosmic censorship, etc. |
| 83C55 | Macroscopic interaction of the gravitational field with matter (hydrodynamics, etc.) |
Keywords:
time-dependent cosmological constant; vacuum energy; deceleration parameter; singularity avoidanceReferences:
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