Density Fluctuations
(a) Random inhomogeneities in an otherwise smooth distribution of matter.
(b) Localized enhancements in the density of either matter alone or matter and radiation in the early universe.
12. Which had density fluctuations first, normal matter or dark matter? _____. (Hint) ...
It is mainly these density fluctuations on a small (tens of nanometers) scale that cause the sky to be blue.
Neutral points ...
On large angular scales, the most important of various physical processes by which the primordial density fluctuations should have left their imprint on the cosmic microwave background radiation in the form of small variations in the ...
Straight density fluctuations will control just when a given volume element recombines through the n² dependence of recombination rate.
For instance MAP will allow scientists to have a better understanding of the structure of the universe as the CMB carries an imprint of the density fluctuations of the early universe in the form of temperature variations.
Astronomers believe that voids are formed by the hierarchical clustering of galaxies around primordial density fluctuations (quantum mechanical fluctuations in the density of the Universe in the very first moments following the Big Bang).
Astronomers can only theorize about how density fluctuations in a sea of subatomic particles could have formed the great variety of galaxy shapes and sizes that make up the universe as we see it today.
Those very small variations correspond to the density fluctuations at the last scattering surface and give valuable information about the seeds for the large scale structures we observe now.
For example, film grain is quantified as graininess via a measurement of film density fluctuations as seen through a 0.048 mm sampling aperture.
[edit] See also ...
As we understand it, current models of density fluctuations that account for these observations do not predict a large number of primordial black holes. Therefore, they are probably not a major component of dark matter.
Information about the density fluctuations is determined by the amplitude of the primordial fluctuations (from cosmic inflation) and the spectral index, ...
 See also: Density, Universe, Model, Time, Background
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