Flatness Problem
A flat Universe is one in which the amount of matter present is just sufficient to halt its expansion, but insufficient to re-collapse it. This would represent a very fine balancing act indeed! ...
Flatness problem
The flatness problem is a cosmological fine-tuning problem with the Big Bang theory, which is solved by hypothesising an inflationary universe.
Flatness problem
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flatness problem One of two conceptual problems with the Standard Big Bang model, which is that there is no natural way to explain why the density of the universe is so close to the critical density.
Flatness Problem
In cosmology the circumstance that the early universe must have contained almost exactly the right amount of matter to close the space-time (to make space-time flat)
Flocculent ...
Flatness Problem
(a) Poses the question: Why, out of an infinite number of possibilities, is our Universe so close to the one special case: the "flat" Universe?
10. The flatness problem is the fact that the observed density of matter is unexpectedly different from the critical density. (Hint)
11. Inflation was caused by the freeze-out of the strong force. (Hint) ...
It should now be clear that the inflationary Universe model provides a conceptual explanation of the horizon problem and the flatness problem.
1969 - Robert Dicke formally presents the Big Bang flatness problem
1973 - Edward Tryon proposes that the universe may be a large scale quantum mechanical vacuum fluctuation where positive mass-energy is balanced by negative gravitational potential ...
The first is called the flatness problem---why is the universe density so nearly at the critical density or put another way, why is the universe so flat?
 See also: Universe, Density, Big Bang, Gravity, Horizon
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