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Paper   IPM / P / 7885
School of Physics
  Title:   Observational Constraints on a Variable Dark Energy Model
1.  M.S. Movahed
2.  S. Rahvar
  Status:   Published
  Journal: Phys. Rev. D
  Vol.:  73
  Year:  2006
  Pages:   083518
  Supported by:  IPM
We present cosmological tests for a phenomenological parametrization of quintessence model with time-varying equation of state on low, intermediate and high redshift observations []. We study the sensitivity of the comoving distance and volume element with the Alcock-Paczynski test to the time varying model of dark energy. At the intermediate redshifts, Gold supernova Type Ia data is used to fit the quintessence model to the observed distance modulus. The value of the observed acoustic angular scale by WMAP experiment also is compared with the model. The combined result of CMB and SNIa data confines w=p/ρ to be more than −1.3 which can violate the dominant energy condition.

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