Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...383...60h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 383, Dec. 10, 1991, p. 60-65.
Astronomy and Astrophysics
Astrophysics
16
Background Radiation, Cosmology, Microwaves, Relativity, Universe, Extraterrestrial Radio Waves, Horizon, Hubble Constant
Scientific paper
Isotropy of the cosmic microwave background radiation highlights the horizon problem. Analysis of the horizon problem and its inflationary solution requires a study of the properties of the Hubble sphere and a distinction between the 'Hubble surface' and the particle horizon. All regions in the visible universe become causally connected when inflation increases the distance of the particle horizon by a factor of 3. If exponential inflation occurs because of a phase transition at a temperature of about 10 exp 15 GeV, the number of e-foldings to effect this threefold increase in the particle horizon distance is N = 60. The properties of the Hubble sphere provide the answer to the question: how, in a universe of age t, can regions separated by distances much greater than ct be causally connected?
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