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Title: 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 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.
Authors:
 [1] ;  [2] ; ;  [3] ;  [4]
  1. Department of Physics, Koç University, 34450 Sariyer, İstanbul (Turkey)
  2. Department of Mathematics, BITS Pilani, Pilani Campus, Rajasthan-333031 (India)
  3. Centre of Theoretical Physics, Jamia Millia Islamia, New Delhi-110025 (India)
  4. Institute of Theoretical Physics, Dalian University of Technology, Dalian, 116024 (China)
Publication Date:
OSTI Identifier:
22369815
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2014; Journal Issue: 01; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCELERATION; COSMOLOGY; DE SITTER GROUP; DE SITTER SPACE; EXPANSION; GENERAL RELATIVITY THEORY; NONLUMINOUS MATTER; NUCLEOSYNTHESIS; POTENTIALS; SCALAR FIELDS; UNIVERSE