Although I didn’t know it at the time, the exponentially expanding space that I discovered was hardly new – it was in fact one of the earliest known solutions to the equations of general relativity. I had rediscovered the equations of de Sitter’s cosmology of 1917, written in a form that was introduced by Georges Lemaître in 1925 as part of his Ph.D. thesis at MIT.Alan Guth, The Inflationary Universe
The Day Without Yesterday, Lemaître, Einstein and the birth of modern cosmology
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