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Journal of Physical Studies 15(1), Article 1901 [12 pages] (2011)
DOI: https://doi.org/10.30970/jps.15.1901 DISTINGUISHABILITY OF SCALAR FIELD MODELS OF DARK ENERGY WITH THE TIME VARIABLE EQUATION OF STATE PARAMETERB. Novosyadlyj, O. Sergijenko, S. Apunevych
Astronomical Observatory of
Ivan Franko National University of Lviv,
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The possibility of distinguishing scalar field models of dark energy with different Lagrangians and time variable equation of state parameter by available observational data is analyzed. The multicomponent cosmological models with the scalar field with either Klein-Gordon or Dirac-Born-Infeld Lagrangians as dark energy and the monotonic decreasing and increasing equation of state parameters are considered. It is concluded that scalar field models of dark energy with decreasing and increasing EoS parameters should be distinguishable at the accuracy level of forthcoming observational data. The Lagrangians of scalar fields could be distinguished by expected observational data (Planck, SDSS etc.) in the case of decreasing EoS parameter, but are practically indistinguishable in the case of the increasing one.
PACS number(s): 95.36.+x, 98.80.-k