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Message: <blockquote data-quote="tharinda07" data-source="post: 3660007" data-attributes="member: 21844">Flatness problem The flatness problem is a <a href="http://en.wikipedia.org/wiki/Physical_cosmology" target="_blank">cosmological</a> <a href="http://en.wikipedia.org/wiki/Fine-tuning" target="_blank">fine-tuning</a> problem within the <a href="http://en.wikipedia.org/wiki/Big_Bang" target="_blank">Big Bang</a> model; i.e., the observation that the current <a href="http://en.wikipedia.org/wiki/Density_of_the_universe" target="_blank">density of the universe</a> is very close to <a href="http://en.wikipedia.org/wiki/Critical_density" target="_blank">its critical value</a> at which space is perfectly flat. Since the total energy density of the universe departs rapidly from the critical value over <a href="http://en.wikipedia.org/wiki/Cosmic_time" target="_blank">cosmic time</a>,the early universe must have had a density even closer to the critical density (see below), leading cosmologists to question how the density of the early universe came to be fine-tuned to this 'special' value. The problem was first mentioned by <a href="http://en.wikipedia.org/wiki/Robert_Dicke" target="_blank">Robert Dicke</a> in 1969. The most commonly-accepted solution among cosmologists is <a href="http://en.wikipedia.org/wiki/Cosmic_inflation" target="_blank">cosmic inflation</a>; along with the <a href="http://en.wikipedia.org/wiki/Monopole_problem" target="_blank">monopole problem</a> and the <a href="http://en.wikipedia.org/wiki/Horizon_problem" target="_blank">horizon problem</a>, the flatness problem is one of the three primary motivations for inflationary theory.</blockquote>

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