density parameter

Symbol: ω. A key parameter in determining the fate of the Universe. It is defined as the ratio of the actual density of matter in the Universe to the critical density, where the critical density is the density of matter above which an expanding Universe will eventually recollapse. It is currently thought that the value of ω is about 0.3. Before 1980 it was one of the mysteries of cosmology as to why the value of ω is fairly close to 1. The theory of inflation provides an explanation of why this is the case.

Mentioned in ?

References in periodicals archive ?

0]) is the cosmic matter density parameter (baryonic + non-baryonic matter), [[OMEGA].

Beyond the Hubble's law

Even if we give the right density parameter values, it will not be able to deal with different range of densities and this may vary based on the nature of data base.

Modified DBSCAN clustering algorithm for data with different densities

However, the train of thought bypasses the vital transport sector, in which the problem of energy storage must also take into account the energy density parameter.

The missing link

Another remark concerning the variances of the estimates of the component density parameter is that increasing (decreasing) the proportion of a component in the mixture reduces (increases) the variance of the estimate of the corresponding parameter.

PROPERTIES AND COMPARISON OF THE BAYES ESTIMAES OF THE BURR MIXTURE PARAMETERS

They have determined that the microwave sky is lumpiest on scales between 12[degrees] and 1[degrees], as predicted for a flat universe (one with a cosmological density parameter 0 of exactly 1).

Cosmology in the new millennium

The sequence of Figures (7-10) shows the Gaussian K(t) and R curvatures, matter density parameter [[OMEGA].

A model for the expansion of the universe

Those parameters range from the Hubble constant (H0), which quantifies the universe's present-day expansion rate, to the cosmological density parameter (W0), which tells how much matter and energy the universe contains.

The race to map : the microwave background

TP] and other cosmological parameters such as the density parameter in dark energy [[OMEGA].

The turning point for the recent acceleration of the universe with a cosmological constant

In fact, say the researchers, the cosmological density parameter, W0, must be 0.

An Old Quasar in a Young Universe

A flat universe, it turns out, is one with a critical value for the density parameter (along with a corresponding contribution from [Lambda]).

Cosmology: all sewn up or coming apart at the seams?

With the larger cameras we are now using, we should obtain enough data to measure the density parameter [[Omega].

Weighing the universe with supernovae

if you change the composition of the sediment during the contract period, the Contractor agrees to exchange center to another in order to reach the assumed density parameters, without changing the price of the product, for which the Contractor agrees;