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Observational constraints on a variable dark energy model

Movahed, M. S ; Sharif University of Technology | 2006

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  1. Type of Document: Article
  2. DOI: 10.1103/PhysRevD.73.083518
  3. Publisher: 2006
  4. Abstract:
  5. We study the effect of a phenomenological parameterized quintessence model on low, intermediate and high redshift observations. At low and intermediate redshifts, we use the Gold sample of supernova Type Ia (SNIa) data and recently observed size of baryonic acoustic peak from Sloan Digital Sky Survey (SDSS), to put constraint on the parameters of the quintessence model. At the high redshift, the same fitting procedure is done using WAMP data, comparing the location of acoustic peak with that obtain from the dark energy model. As a complementary analysis in a flat universe, we combine the results from the SNIa, CMB and SDSS. The best fit values for the model parameters are Ωm=0.27-0.02+0.02 (the present matter content) and w0=-1.45-0.60+0.35 (dark energy equation of state). Finally we calculate the age of universe in this model and compare it with the age of old stars and high redshift objects. © 2006 The American Physical Society
  6. Keywords:
  8. Source: Physical Review D - Particles, Fields, Gravitation and Cosmology ; Volume 73, Issue 8 , 2006 ; 15507998 (ISSN)
  9. URL: https://journals.aps.org/prd/abstract/10.1103/PhysRevD.73.083518