What is Cosmological constant?, Explain Cosmological constant, Define Cosmological constant скачать в хорошем качестве

What is Cosmological constant?, Explain Cosmological constant, Define Cosmological constant

~~~ Cosmological constant ~~~ Title: What is Cosmological constant?, Explain Cosmological constant, Define Cosmological constant Created on: 2018-08-25 Source Link: https://en.wikipedia.org/wiki/Cosmolo... ------ Description: In cosmology, the cosmological constant is the value of the energy density of the vacuum of space. It was originally introduced by Albert Einstein in 1917 as an addition to his theory of general relativity to "hold back gravity" and achieve a static universe, which was the accepted view at the time. Einstein abandoned the concept after Hubble's 1929 discovery that all galaxies outside the Local Group are moving away from each other, implying an overall expanding universe. From 1929 until the early 1990s, most cosmology researchers assumed the cosmological constant to be zero. Since the 1990s, several developments in observational cosmology, especially the discovery of the accelerating universe from distant supernovas in 1998 , have shown that around 68% of the mass–energy density of the universe can be attributed to dark energy. While dark energy is poorly understood at a fundamental level, the main required properties of dark energy are that it functions as a type of anti-gravity, it dilutes much more slowly than matter as the universe expands, and it clusters much more weakly than matter, or perhaps not at all. The cosmological constant is the simplest possible form of dark energy since it is constant in both space and time, and this leads to the current standard model of cosmology known as the Lambda-CDM model, which provides a good fit to many cosmological observations. ------ To see your favorite topic here, fill out this request form: https://docs.google.com/forms/d/e/1FA... ------ Source: Wikipedia.org articles, adapted under https://creativecommons.org/licenses/... license. Support: Donations can be made from https://wikimediafoundation.org/wiki/... to support Wikimedia Foundation and knowledge sharing.