Nathan Rosen (Hebrew: נתן רוזן; March 22, 1909 – December 18, 1995) was an American and Israeli physicist noted for his study on the structure of the hydrogen molecule and his collaboration with Albert Einstein and Boris Podolsky on entangled wave functions and the EPR paradox.

As a student he published several papers of note, one being "The Neutron," which attempted to explain the structure of the atomic nucleus a year before their discovery by James Chadwick.

Around 1927, Niels Bohr and Werner Heisenberg, collaborating with many other physicists, developed the Copenhagen interpretation of quantum theory, determining the probabilities of the movement of particles.

[1] In July 1935[4] Einstein and Rosen published an article developing a concept of folded space time in parallel layers connected by a bridge, using only General Relativity and Maxwell's equations.

This concept, known today as an Einstein-Rosen bridge, was shown in a 1962 paper by theoretical physicists John A. Wheeler and Robert W. Fuller to be unstable.

"In a 1988 paper, physicists Kip Thorne and Mike Morris proposed that such a wormhole could be made stable by containing some form of negative matter or energy."

Between 1940 and 1989 Rosen published a series of articles on his versions of bimetric gravity, an attempt to improve on General Relativity by removing singularities and replacing pseudo-tensors with tensors to eliminate nonlocality.