Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2011-03-08
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
13 pages, 10 eps figures
Scientific paper
From the analysis of Supernova Ia data alongwith Observational Hubble data (OHD) and Baryon Acoustic Oscillation (BAO) data, we attempt to find out the nature of a scalar potential that may be responsible for the Dark Energy of the universe. We demonstrate that in order to explain the varying dark energy equation state that has been obtained in a model independent way from such analyses, we need to invoke a quintom scalar field when the obtained dark energy equation of state ($\omega_X(z)$) has a "quintessence" part ($\omega_X(z) > -1$) and a "phantom" part ($\omega_X(z) < -1$). We consider a Gaussian type potential for such scalar fields and compare the dark energy equation of state derived from such potential with the one computed from the data analysis.
Adak Debabrata
Bandyopadhyay Abhijit
Majumdar Debasish
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