- Equation of state (cosmology)
In cosmology, the equation of state of a
perfect fluidis characterized by a dimensionlessnumber "w", equal to the ratio of its pressure"p" to its energy densityρ: . It is closely related to the thermodynamic equation of stateand ideal gas law.
The perfect gas equation of state may be written as :where is the mass density, "R" is the particular gas constant, "T" is the temperature and "C" = ("RT")1/2 is a characteristic thermal speed of the molecules. Thus:where and
Wikimedia Foundation. 2010.
Look at other dictionaries:
Equation of state — In physics and thermodynamics, an equation of state is a relation between state variables.cite book | author=Perrot, Pierre | title=A to Z of Thermodynamics | publisher=Oxford University Press | year=1998 | id=ISBN 0 19 856552 6] More… … Wikipedia
Self-creation cosmology — (SCC) theories are gravitational theories in which the mass of the universe is created out of its self contained gravitational and scalar fields, as opposed to the theory of continuous creation cosmology or the steady state theory which depend on … Wikipedia
Inflation (cosmology) — Inflation model and Inflation theory redirect here. For a general rise in the price level, see Inflation. For other uses, see Inflation (disambiguation). Physical cosmology … Wikipedia
Timeline of cosmology — This timeline of cosmological theories and discoveries is a chronological catalog of the evolution of humankind s understanding of the cosmos over the last two plus millennia. Modern cosmological conceptions follow the development of the… … Wikipedia
Physical cosmology — This article is about the physics subject. For other uses, see Cosmology. Physical cosmology … Wikipedia
Scale factor (cosmology) — The scale factor or cosmic scale factor parameter of the Friedmann equations is a function of time which represents the relative expansion of the universe. It is sometimes called the Robertson Walker scale factor. It is the (time dependent)… … Wikipedia
Distance measures (cosmology) — Physical cosmology Universe · Big Bang … Wikipedia
Wheeler–deWitt equation — In theoretical physics, the Wheeler DeWitt equation [DeWitt, B.S., “Quantum Theory of Gravity. I. The Canonical Theory”, Phys. Rev., 160, 1113 1148, (1967).] is a functional differential equation. It is ill defined in the general case, but very… … Wikipedia
Hartle–Hawking state — The Hartle Hawking state is a proposal concerning the state of the universe prior to the Planck epoch. Hartle Hawking is essentially a no boundary proposal that the universe is infinitely finite: that there was no time before the Big Bang because … Wikipedia
Dark energy — Not to be confused with dark matter, dark fluid, or dark flow. Physical cosmology … Wikipedia