How Friedmann Shod Einstein

TL;DR

This paper reviews Friedmann's groundbreaking discovery that General Relativity predicts an expanding, non-stationary universe, highlighting his scientific contributions and the public impact of his work from a historical perspective.

Contribution

It provides a historical overview of Friedmann's discovery and his efforts to communicate the concept of an expanding universe to the general public.

Findings

Friedmann's equations predict a dynamic universe.

He authored a popular book explaining the expanding universe.

His work marked a revolutionary shift in cosmology.

Abstract

Exactly one hundred years ago, in May 1922, Alexander Friedmann discovered that General Relativity (GR) predicts non-stationary Universe. His equation describing the evolution of the Universe is now named after him. In this paper we briefly recall the human and scientific aspects of this revolutionary change in our picture of the world. We also recall that immediately after finishing his seminal paper Friedmann wrote a book on GR for a wide audience. In that book he presented an impressive picture of the expanding Universe created from nothing.