Friday, July 19, 2013

1307.4911 (Ozgur Akarsu et al.)

Cosmology with hybrid expansion law: scalar field reconstruction of
cosmic history and observational constraints

Ozgur Akarsu, Suresh Kumar, R. Myrzakulov, M. Sami, Lixin Xu
In this paper, we consider a simple form of expansion history of Universe referred to as the hybrid expansion law - a product of power-law and exponential type of functions. The ansatz by construction mimics the power-law and de Sitter cosmologies as special cases but also provides an elegant description of the transition from deceleration to cosmic acceleration. We point out the Brans-Dicke realization of the cosmic history under consideration. We construct potentials for quintessence, phantom and tachyon fields, which can give rise to the hybrid expansion law in general relativity. We investigate observational constraints on the model, and study the late time acceleration as well as the early Universe a la nucleosynthesis.
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