Why did Albert Einstein told that the value of lambda is 0 when it was prove that he was wrong considering universe to be static?
I hope you get it...
I am not sure just I read it
No spam!
Answers
Answer:
Explanation:
In 1917, a year after Albert Einstein’s general theory of relativity was published — but still two years before he would become the international celebrity we know — Einstein chose to tackle the entire universe. For anyone else, this might seem an exceedingly ambitious task — but this was Einstein.
Einstein began by applying his field equations of gravitation to what he considered to be the entire universe. The field equations were the mathematical essence of his general theory of relativity, which extended Newton’s theory of gravity to realms where speeds approach that of light and masses are very large. But his math was better than he wanted to believe — his equations told him that the universe could not stay static: It had to either expand or contract. Einstein chose to ignore what his mathematics was telling him.
In cosmology, the cosmological constant (usually denoted by the Greek capital letter lambda: Λ), alternatively called Einstein's cosmological constant, is the energy density of space, or vacuum energy, that arises in Einstein's field equations of general relativity. It is closely associated to the concept of dark energy.[1]
Sketch of the timeline of the Universe in the ΛCDM model. The accelerated expansion in the last third of the timeline represents the dark-energy dominated era.
Einstein originally introduced the concept in 1917[2] to counterbalance the effects of gravity and achieve a static universe, a notion which was the accepted view at the time. Einstein abandoned the concept in 1931 after Hubble's confirmation of the expanding universe.[3] From the 1930s until the late 1990s, most physicists assumed the cosmological constant to be equal to zero.[4] That changed with the surprising discovery in 1998 that the expansion of the universe is accelerating, implying the possibility of a positive nonzero value for the cosmological constant.[5]