Is it realistic to assume the same cosmic equation of state prior to and after atom formation?
- Conference date: 17-19 October 2006
- Location: Madrid (Spain)
Previous work (Acta Cosmologica XXIV‐3, Krakov 1998) did show the close coincidence of two times: (1) the matter/radiation density equality time and (2) the atom formation time. This coincidence was obtained substituting observed data into the standard Friedmann‐Lemaître solutions (with Λ=0). This work anticipated precisely the present “age” of the universe [t0∼(13.7±0.2)×109 years] and the present value of the local Hubble parameter [H0∼(65±2) km s/Mcp] given in February 2003 by NASA’s WMAP satellite. For the cosmic epoque considered in this previous work, the cosmic equation of state was RT ∼ constant, consistent with a transparent universe made of atoms. Present work shows that a better coincidence between calculated and observed cosmic time (tns) and density (ρns) is obtained for primordial nucleosynthesis with a “plasma” equation of state RT4/3 ∼ constant. This is perfectly consistent with a change in equation of state from atom formation time to present resulting in a t0 and a ρ0 in agreement with WMAP observations.
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