Physics
Scientific paper
Apr 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aipc..905....6c&link_type=abstract
FRONTIERS OF FUNDAMENTAL PHYSICS: Eighth International Symposium FFP8. AIP Conference Proceedings, Volume 905, pp. 6-12 (2007).
Physics
Cosmology
Scientific paper
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.
Cereceda N.
Gonzalo Julio A.
Lifante G.
Marques Manuel I.
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