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kiru
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what is cosmological constant?Why it is introduced by Enstien.?
kiru said:I thank you sir for giving me your suggestions.But as you said I don't make fun in seeing others responding me.Now only I got the oppurtunity to make use of this forum.As I have lots of doubts which my professors don't want to answer.I know that I am very low in knowledge.Yet in any way I want to acquire it.And from now onwards I will try to refine my approach of learning one at a time.Once again I sincerely thank you.You made me burst into tears.
The cosmological constant, denoted by the Greek letter lambda (Λ), is a term in Einstein's theory of general relativity that represents the energy density of empty space. It is often referred to as the "vacuum energy" or "dark energy."
The cosmological constant is thought to be responsible for the observed accelerating expansion of the universe. This means that the space between galaxies is expanding at an increasing rate, causing them to move further apart from each other over time.
The existence of the cosmological constant is supported by various pieces of observational evidence, such as the redshift of distant galaxies, the cosmic microwave background radiation, and the large-scale structure of the universe. These observations suggest that the universe is expanding and that this expansion is accelerating, which requires the presence of a cosmological constant.
The cosmological constant is important because it helps us to explain the behavior of the universe on a large scale. It is one of the key components of the standard model of cosmology and is necessary to account for the observed expansion of the universe. It also plays a role in the formation of galaxies and the distribution of matter in the universe.
Despite its name, the value of the cosmological constant is not actually constant. It can change over time and may have been different in the past. This is a topic of ongoing research in cosmology, and scientists are still trying to understand the exact nature and behavior of the cosmological constant.