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**Shared August 1, 2019**

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This video is about how Albert Einstein made a mistake when applying the Field Equations of General Relativity to cosmology (in particular, to a static, constant density universe), and solved the problem by introducing the cosmological constant, rather than allowing for a dynamic universe with a scale factor - that is, the Friedmann-Lemaitre-Robertson-Walker universe, first developed by Alexander Friedmann of Russia. Later, it was discovered by the Slipher and Hubble red-shift that the universe is indeed expanding, and even later, by Schwarz and company in 1998, that the expansion is accelerating - aka, dark energy. And the cosmological constant was re-introduced.

Thanks to Grant Sanderson of http://www.youtube.com/3Blue1Brown for help with the fancy equation animation!

REFERENCES

The Einstein Field Equations

https://en.wikipedia.org/wiki/Einstei...

Interrogating the Legend of Einstein’s “Biggest Blunder”

https://arxiv.org/abs/1804.06768

On the General Theory of Relativity (Einstein)

https://einsteinpapers.press.princeto...

The Foundation of the General Theory of Relativity (Albert Einstein)

https://einsteinpapers.press.princeto...

Cosmological Considerations in the General Theory of Relativity

https://einsteinpapers.press.princeto...

Einstein Wrongly Criticizes Alexander Friedmann

https://einsteinpapers.press.princeto...

Alexander Friedmann Corrects Einstein

https://einsteinpapers.press.princeto...

Einstein Admits his Mathematical Mistake

https://einsteinpapers.press.princeto...

The Field Equations of Gravitation

https://einsteinpapers.press.princeto...

George Gamow

https://en.wikipedia.org/wiki/George_...

Mach’s Principle

https://en.wikipedia.org/wiki/Mach%27...

Equivalence Principle

https://en.wikipedia.org/wiki/Equival...

Sean Carroll and William Press Paper

https://preposterousuniverse.com/wp-c...

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