Cosmology with hybrid expansion law: scalar field reconstruction of cosmic history and observational constraints
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 descri...
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| Veröffentlicht in: | Journal of cosmology and astroparticle physics 2014-01, Vol.2014 (1), p.i-23 |
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| container_title | Journal of cosmology and astroparticle physics |
| container_volume | 2014 |
| creator | Akarsu, Ozgur Kumar, Suresh Myrzakulov, R Sami, M Xu, Lixin |
| description | 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 with hybrid expansion law applied to late time acceleration as well as to early Universe a la nucleosynthesis. |
| doi_str_mv | 10.1088/1475-7516/2014/01/022 |
| format | Article |
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| source | IOP Publishing Journals; Institute of Physics (IOP) Journals - HEAL-Link |
| subjects | ACCELERATION ASTROPHYSICS, COSMOLOGY AND ASTRONOMY Construction COSMOLOGY DE SITTER GROUP DE SITTER SPACE Deceleration EXPANSION GENERAL RELATIVITY THEORY Law Mathematical models NONLUMINOUS MATTER NUCLEOSYNTHESIS POTENTIALS SCALAR FIELDS Scalars Tachyons UNIVERSE |
| title | Cosmology with hybrid expansion law: scalar field reconstruction of cosmic history and observational constraints |
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