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


Akarsu O. , KUMAR S., MYRZAKULOV R., SAMI M., XU L.

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, no.1, 2014 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Publication Date: 2014
  • Doi Number: 10.1088/1475-7516/2014/01/022
  • Title of Journal : JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
  • Keywords: dark energy theory, supernova type Ia - standard candles, big bang nucleosynthesis, BARYON ACOUSTIC-OSCILLATIONS, EQUATION-OF-STATE, DARK-ENERGY, ACCELERATING UNIVERSE, MODIFIED GRAVITY, MODELS, INFLATION, PARAMETER, CONSTANT, DYNAMICS

Abstract

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.