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Paper   IPM / Physic / 7208
School of Physics
  Title:   Search for the Cosmic Equation of State at High Redshifts
  Author(s):  F. Nasseri
  Status:   Preprint
  Journal:
  No.:  0
  Year:  2002
  Supported by:  IPM
  Abstract:
We study the equation of state at high redshift   = 1017, following the prescription outlined by Saini et al. [1]. Extending this prescription to high redshift, we obtain in recombination z=1000 and in the early matter-dominated era which lies between last-scattering surface z=1100 and the equality of radiation-matter z=3000, omega is   = −0.14. For 0 < = z < = 7.34 and 29 < = z < = 107, we find -1640 < = ω < = 0. At redshift 7.35 < = z < = 29, we obtain 0 < = ω < = 335 and for z > = 107, ω possesses disorderly oscillations so that ω = 0.14 at nucleosynthesis z = 1010. At redshift 7.34 < = z < = 7.35, ω behaves asymptotically.

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