The ratio of the current value of the density of the universe to the currentvalueofthecriticaldensityiscalledthedensityparameterΩ 0 = ρ / ρ cr. The density parameter is the ratio of the average density of matter and energy in the Universe to the critical density (the density at which the Universe would stop expanding only after an infinite time). If the density of the universe is equal to the critical density, then we live in a 'flat' universe. The critical density is the mass density of the universe which just stops the expansion of space, but only after after infinite time. 6 March 2003. A) the universe is expanding at a rate greater than the escape speed of the universe. 10 53 kg: Ryden, Barbara. D) the universe is expanding at a rate equal to the speed of light. "Since the exact density of the universe is not known yet, different sources gave different results. If the density is more than the critical density, the universe is closed and curves like a sphere; if less, it will curve like a saddle. Approximately equal to the critical density c. One two-hundredth (0.5%) of the critical density d. One-fourth of the critical density e. One-tenth of the critical density The critical density = 3 H 2 /(8 p G ), where H is the Hubble parameter for our cosmological time.
It actually comes out as a parameter in the Friedmann equation for the expansion of the universe.
B) the universe is expanding at a rate equal to the escape speed of the universe. We require Hubble's Constant, The Universal Constant of Gravitation and The speed of light only. Including dark matter, what is the apparent density of the universe compared to the critical density?
If the density of the Universe is greater than this the universe will contract, if it is less it will expand for ever! In other words, as long as the density of matter remains at or above a certain value (1-3 ×10 -26 kg of matter per m³), the Universe will eventually contract. critical density synonyms, critical density pronunciation, critical density translation, English dictionary definition of critical density.
The relation between the actual density and the critical density determines the overall geometry of the universe; when they are equal, the geometry of the universe … mann solutions, the critical density is a particular density at which the the universe is flat or Euclidean and as a result the curvature parameter vanishes. The luminosity density of the Universe is about 190 million solar luminosities per cubic Megaparsec (Mpc) at visual wavelengths for H o = 71.
The density parameter (Ω 0) is given by:. One one-thousandth (0.1%) of the critical density b.
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