The horizon problem in Friedmann-Robertson-Walker cosmology

Details The horizon problem in Friedmann-Robertson-Walker cosmology The horizon problem in Friedmann-Robertson-Walker cosmology

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993gregr..25..579c&link_type=abstract

General Relativity and Gravitation, Volume 25, Issue 6, pp.579-587

Physics

1

Scientific paper

The horizon problem is studied in the Friedmann-Robertson-Walker (FEW) models. The exact condition for which an observer does not have the horizon problem for a hypersurfacet = constant is derived first in terms of the redshift, then in terms of the temperature which is an observer-independent parameter. It is shown that there are no values of the deceleration parameterq o that solve the problem for the recombination hypersurface, while the usual approximated way to investigate this problem leads to a very small positive value of qo — Moreover, the temperature parameter allows us to show when the horizon problem arises and afterwards increases with time. Not being restricted to the Cosmic Microwave Background (CMB) case, its evolution ought to be considered when searching for a possible solution.

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