Thanks to Brilliant for supporting MinutePhysics. Get 20% off a premium subscription at www.Brilliant.org/minutephysics 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. REFERENCES The Einstein Field Equations en.wikipedia.org/wiki/Einstein_field_equations Interrogating the Legend of Einstein’s “Biggest Blunder” arxiv.org/abs/1804.06768 On the General Theory of Relativity (Einstein) einsteinpapers.press.princeton.edu/vol6-trans/110 The Foundation of the General Theory of Relativity (Albert Einstein) einsteinpapers.press.princeton.edu/vol6-trans/158 Cosmological Considerations in the General Theory of Relativity einsteinpapers.press.princeton.edu/vol6-trans/433 Einstein Wrongly Criticizes Alexander Friedmann einsteinpapers.press.princeton.edu/vol13-trans/301 Alexander Friedmann Corrects Einstein einsteinpapers.press.princeton.edu/vol13-trans/363 Einstein Admits his Mathematical Mistake einsteinpapers.press.princeton.edu/vol14-trans/77 The Field Equations of Gravitation einsteinpapers.press.princeton.edu/vol6-trans/129 George Gamow en.wikipedia.org/wiki/George_Gamow Mach’s Principle en.wikipedia.org/wiki/Mach%27s_principle Equivalence Principle en.wikipedia.org/wiki/Equivalence_principle Sean Carroll and William Press Paper preposterousuniverse.com/wp-content/uploads/cpt92.pdf Support MinutePhysics on Patreon! www.patreon.com/minutephysics Link to Patreon Supporters: www.minutephysics.com/supporters/ MinutePhysics is on twitter - @minutephysics And facebook - facebook.com/minutephysics And Google+ (does anyone use this any more?) - bit.ly/qzEwc6 Minute Physics provides an energetic and entertaining view of old and new problems in physics -- all in a minute! Created by Henry Reich

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