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Cosmological constant - Wikipedia
In cosmology, the cosmological constant (usually denoted by the Greek capital letter lambda: Λ) is the value of the energy density of the vacuum of space.
https://en.wikipedia.org/wiki/Cosmological_constant
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Einstein field equations - Wikipedia
The Einstein field equations (EFE; also known as Einstein's equations) is the set of 10 equations in Albert Einstein's general theory of relativity that describes the fundamental interaction of gravitation as a result of spacetime being curved by mass and energy.
https://en.wikipedia.org/wiki/Einstein_field_equations
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Investigations of solutions of Einstein’s field
equations close to λ-Taub-NUT
We present investigations of a class of solutions of Einstein’s field
equations close to the family of λ-Taub-NUT spacetimes. The studies are
done using a numerical code introduced by the author elsewhere.
https://arxiv.org/pdf/0804.4224.pdf
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Einstein's Lost Theory Describes a Universe Without a Big Bang - The Crux
A newly-discovered manuscript sheds new light on Einstein's thinking about cosmology - and how he resisted the idea of a beginning to the universe.
http://blogs.discovermagazine.com/crux/2014/03/07/einsteins-lost-theory-describes-a-universe-without-a-big-bang/
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Einstein's Greatest Blunder? - Scientific American Blog Network
He abandoned the idea of a static, nonexpanding universe in 1929—but some physicists are beginning to reconsider it
https://blogs.scientificamerican.com/guest-blog/einsteins-greatest-blunder/
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Cosmological Constant, also known as Lambda
The COSMOLOGICAL CONSTANT is an extra term added by Einstein in working out equations in general relativity that describe the universe in the situation when it is "static", that is, not expanding. Remember that Einstein worked out the solutions before Hubble discovered that the universe was expanding.
http://www.astro.cornell.edu/academics/courses/astro201/lambda.htm
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Einstein's 'Biggest Blunder' Turns Out to Be Right
What Einstein called his worst mistake, scientists are now depending on to explain the universe.
https://www.space.com/9593-einstein-biggest-blunder-turns.html
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Right Again, Einstein! New Study Supports 'Cosmological Constant'
A new measurement of one of the universe's fundamental constants casts doubt on an alternative to the cosmological constant theory of dark energy.
https://www.space.com/19282-einstein-cosmological-constant-dark-energy.html
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Dark Energy Could Be Einstein's Cosmological Constant | WIRED
Dark energy, which forms almost three-quarters of the universe, is the most mysterious stuff known to man. A new set of Chandra X-Ray Observatory data, however, has given scientists good information on what dark energy might actually be. Turns out, it looks suspiciously like Einstein’s cosmological constant, a factor he added to his theory of \[…\]
https://www.wired.com/2008/12/dark-energy-ein
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Cosmological constant - Scholarpedia
In the context of cosmology the cosmological constant is a homogeneous energy density that causes the expansion of the universe to accelerate. Originally proposed early in the development of general relativity in order to allow a static universe solution it was subsequently abandoned when the universe was found to be expanding.
http://www.scholarpedia.org/article/Cosmological_constant
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HubbleSite - Dark Energy - Did Einstein Predict Dark Energy?
Oddly enough, dark energy — for all the surprise around its discovery — is not an entirely new concept in physics. There is historical background for this idea, and it comes from the preeminent astronomer of the 20th century, Albert Einstein.
http://hubblesite.org/hubble_discoveries/dark_energy/de-did_einstein_predict.php
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Cosmological Constant
Recently two different groups have measured the apparent brightness of supernovae with redshifts near z = 1. Based on this data the old idea of a cosmological constant is making a comeback.
http://www.astro.ucla.edu/~wright/cosmo_constant.html
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Cosmological constant - Wikiquote
The cosmological constant ( {\displaystyle \Lambda } {\displaystyle \Lambda }, or also indicated by λ) is the value of the energy density of the vacuum of space.
https://en.wikiquote.org/wiki/Cosmological_constant
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Cosmological Constant - The Weight of the Vacuum - T. Padmanabhan
Originally, Einstein introduced the cosmological constant Lambda in the field equation for gravity (as in equation (5)) with the motivation that it allows for a finite, closed, static universe in which the energy density of matter determines the geometry.
https://ned.ipac.caltech.edu/level5/Sept02/Padmanabhan/Pad1_2.html
