In a k = 0 matter-dominated universe the age is related to H by t = (2/3)H-1, so RH = (3/2)t.
In the early radiation-dominated universe t = (1/2)H-1, so RH = 2t..
These universes can take two forms: matter-dominated universes, and radiation-dominated universes.
The radiation-dominated form characterizes our early universe, and the matter-dominated form characterizes our universe today - or so cosmologists believed until observations led to theories of dark energy in the 1990s.Jan 21, 2013.
The dominating form of energy in the cosmos, dark energy is driving the accelerating expansion of the universe, but its nature remains a complete mystery..
A radiation-dominated era of the Universe is one where the dominant constituent within the Universe is relativistic particles.
These particles might for instance be photons of light or neutrinos..
Estimated ratios of dark matter and dark energy (which may be the cosmological constant) in the universe.
According to current theories of physics, dark energy now dominates as the largest source of energy of the universe, in contrast to earlier epochs when it was insignificant..
The period from about 10−43 s (the Planck era) to 30 000 years after the Big Bang.
During this time, the expansion of the Universe was dominated by the effects of radiation or high-speed particles (at high energies, all particles behave like radiation)..
After the inflationary era the Universe became radiation dominated.
The era of radiation domination is defined as the phase during which the temperature of the Universe was so high that the kinetic energy of the massive particles in the Universe were too large compared to their rest masses..
In the beginning, we compare the energy density of matter to that of radiation.
This will enable us to see if our universe is matter dominated or radiation dominated.
Radiation prevalent in the present universe can be attributed very little to the stellar sources, but it is mainly due to the remnant CMB (Cosmic Microwave Background).
The Radiation-Dominated Universe in Nonstandard Cosmology Abstract We continue the recent study of our model theory of low-density cosmology without dark matter.
We assume a purely radiative spherically symmetric background and treat matter as anisotropic perturbations.
Einstein’s equations for the background are solved numerically.
Radiation prevalent in the present universe can be attributed very little to the stellar sources.
For a dusty universe, pressure is zero.
CMB is very cold.
Cosmology Radiation Dominated Universe - In this chapter, we will discuss the Solutions to Friedmann Equations relating to the Radiation Dominated Universe.
Thus, as the density of other forms of matter – dust and radiation – drops to very low concentrations, the cosmological constant (or "dark energy") term will eventually dominate the energy density of the Universe.
