http://arxiv.org/abs/1610.04419
The present work deals with a kinematic approach to the modelling the late time dynamics of the universe. This approach is based upon the assumption of constant value of cosmological jerk parameter, which is the dimensionless representation of the 3rd order time derivative of the scale factor. For the $\Lambda$CDM model, the value of jerk parameter is -1 throughout the evolution history. Now any model dependent estimation of the value of the jerk parameter would indicate the deviation of the model from the cosmological constant. In the present work, it has also been shown that for a constant jerk parameter model, any deviation of its value from -1 would not allow the dark matter to have an independent conservation, thus indicating towards an interaction between dark matter and dark energy. Statistical analysis with different observational data sets (namely the observational Hubble parameter data (OHD), the type Ia supernova data (SNe), and the baryon acoustic oscillation data (BAO)) along with the cosmic microwave background (CMB) data (namely the CMB shift parameter) lead to a well constrained values of the jerk parameter and the model remains at a very close proximity of the $\Lambda$CDM.
A. Mukherjee and N. Banerjee
Mon, 17 Oct 16
33/53
Comments: 12 pages, 5 figures
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