Abstract
Friedmann equation of cosmology is based on the field equations of general relativity. Its derivation is straight-forward once the Einstein’s field equations are given and the derivation is independent of quantum mechanics. In this paper, it is shown that the Friedmann equation pertinent to a homogeneous, isotropic and flat universe can also be obtained as a consequence of the energy balance in the expanding universe between the positive energy associated with vacuum and matter, and the negative gravitational energy. The results obtained here is a clear consequence of the fact that the surface area of the Hubble sphere is proportional to the total amount of information contained within it.
Highlights
IntroductionThe speed at which objects recede from an observer increases as the distance to the object increases
In an expanding universe, the speed at which objects recede from an observer increases as the distance to the object increases
Friedmann equation of cosmology is based on the field equations of general relativity
Summary
The speed at which objects recede from an observer increases as the distance to the object increases. There is a distance beyond which this speed becomes larger than the speed of light.
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