Remya Nair, Sanjay Jhingan, Deepak Jain
The origin of the accelerated expansion of the Universe remains an unsolved mystery in Cosmology. The cosmological constant, though successful in explaining current observations, suffers from serious theoretical problems. In this work we consider a spatially flat Friedmann-Robertson-Walker (FRW) Universe with non-relativistic matter and a single scalar field contributing to the energy density of the Universe. Properties of this scalar field, like potential, kinetic energy, equation of state etc. are reconstructed from Supernovae, BAO and Hubble data using Gaussian processes. The reconstructed properties like jerk parameter and equation of state are consistent with the cosmological constant, but we find a hint of phantom like behaviour in the past from the Hubble rate measurements.
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http://arxiv.org/abs/1306.0606
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