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Einstein's Other Theory of Everything

After Einstein explained gravity as a consequence of curved spacetime, he tried to explain matter the same way.

Einstein, feeling that his theory of general relativity was incomplete, wanted to develop a unified field theory—a framework that would combine space and time with energy and matter. Einstein’s quest to get rid of black hole singularities is what led to his famous paper with Nathan Rosen in 1935, in which they introduced what is now called an Einstein-Rosen bridge. Instead, he pursued a different direction which he had proposed in 1925: that the properties of matter are encoded in the relations between different locations in spacetime, an approach that he dubbed “tele-parallelism.” It is this tele-parallelism that later became known as Einstein’s unified field theory.

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