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Comment: 5 pages, to appear in Int. J. Mod. Phys. A
Comment: 11 pages, Accepted (Int. J. Theor. Phys.)
Observational evidence for the existence of dark energy is strong. Here we suggest a model which is based on a modified gravitational theory in 5D and interpret the 5th dimension as a manifestation of dark energy in the 4D observable universe. We also obtain an equation of state parameter which varies with time. Finally, we match our model with observations by choosing the free parameters of the model.
Comment: 12 pages, 14 figures, references added, to appear in Astophysics and Space Science
Comment: 15 pages, 16 figures, The version to appear in Phys. Rev. D
Comment: This paper has been withdrawn by the author because some corrections are needed
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