Big Bang model
The prevailing Big Bang model accounts for many of the experimental observations described above, such as the correlation of distance and redshift
Redshift ...
The Big Bang model or theory is the prevailing cosmological theory of the early development of the universe. According to the Big Bang model, the universe was originally in an extremely hot and dense state that expanded rapidly.
The Big Bang model is a widely held theory of the evolution of the universe.
The Big Bang model of the universe's birth is the most widely accepted model that has ever been conceived for the scientific origin of everything. No other model can predict as much with as high accuracy as the Big Bang model can.
The Big Bang model has its roots in the work of Lemaitre, Gamow and colleagues who, by reversing the observed expansion, concluded that the Universe must have began in an initially very hot, dense state.
In the big bang model, by contrast, the cosmological principle suggests the universe is homogeneous on large scales, and structures form hierarchically: the smallest objects forming first followed by larger objects.
Using the Big Bang model, it is possible to make predictions about elemental abundances and to explain some observations which would otherwise be difficult to account for. One such observation is the existence of deuterium.
Using the Big Bang model it is possible to calculate the concentration of helium-4, helium-3, deuterium and lithium-7 in the universe as ratios to the amount of ordinary hydrogen, H.
Standard Big Bang Model
The Friedmann - Lemaître cosmological models of an isotropic and homogeneous Universe composed of expanding matter and radiation.
The three standard Big Bang models that were formulated by Friedmann and Lemaître. [Silk90]
Friedmann Models ...
This was a key piece of evidence suggesting an expanding Universe and supporting a Big Bang model. hydrogen The most abundant element in the Universe, its most common isotope has a single electron orbiting a proton..
The second problem with the standard Big Bang model is called the flatness problem.
There are a couple of problems with the standard Big Bang model. The first is called the flatness problem---why is the universe density so nearly at the critical density or put another way, why is the universe so flat?
The strongest upper limit on the masses of neutrinos comes from cosmology: the Big Bang model predicts that there is a fixed ratio between the number of neutrinos and the number of photons in the cosmic microwave background.
It fits, in all manner, exactly what the Big Bang model would predict. There used to be some aspects in the radiation that appeared to conflict with the Big Bang, but when analysed further there only was more evidence.
Universal expansion.
Primordial nucleosynthesis and q0: the relative primordial abundances of H, D, He, Li, and Be are predicted by a simple Big Bang model, ...
INFLATIONARY SCENARIO - Modification of the Big Bang model in which a large cosmological constant exists temporarily early in the history of the Big Bang, leading to a rapid accelerating expansion of the Universe, ...
This is often illustrated by newspaper headlines: "Scientist sees face of God, confirms Big Bang model" (a reference to results from the Cosmic Background Explorer satellite), "Is the cosmos younger than some of the stars it contains?
The best current cosmological model is the expanding universe Big Bang model. Our goal in this section is to understand what this model means, what its predictions are, and what problems or unanswered questions remain.
The Cosmological Principle ...
horizon problem One of two conceptual problems with the standard Big Bang model, which is that some regions of the universe which have very similar properties are too far apart to have exchanged information in the age of the universe.
While most astronomers accept the basic concepts behind the Big Bang model, there are still some problems with it and some details that need to be worked out. It covers most of the bases, so most astronomers are pretty happy with it.
 See also: Big Bang, Universe, Model, Light, Earth
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