David Finkelstein

David Finkelstein

David Ritz Finkelstein (born July 19, 1929, New York City) is currently an emeritus professor of physics at the Georgia Institute of Technology. Finkelstein obtained his Ph.D. in physics at the Massachusetts Institute of Technology in 1953. From 1964 to 1976, he was professor of physics at Yeshiva University.

In 1958 Charles W. Misner and he found the gravitational kink, a topological defect in the gravitational metric, whose quantum theory could exhibit spin 1/2. The simplest kink exhibited an easily understood event horizon that led him to recognize the one in the Schwarzschild metric and eliminate its coordinate singularity. This work influenced the decisions of Roger Penrose and John Archibald Wheeler to accept the physical existence of event horizons and black holes.

Most of Finkelstein's work is directed toward a quantum theory of space-time structure. He early on accepted the conclusion of John von Neumann that anomalies of quantum mechanical measurement are anomalies of the logic of quantum mechanical systems. Therefore he formed quantum analogues of set theory, the standard language for classical space-time structures, and proposed that space-time is a quantum set of space-time quanta dubbed "chronons," a form of quantum computer with spins for quantum bits, as a quantum version of the cellular automaton of von Neumann. His early quantum space-times proving unphysical, he has since studied chronons with a regularized form of Bose-Einstein statistics due to Tchavdar D. Palev.

He investigated ball lightning with Julio Rubenstein and James R. Powell. They concluded that ball lightning is most likely a wandering St. Elmo's fire, a low-temperature soliton in the atmospheric electric current flow.

He also put forward an original excellent interpretation of the engraving Melencolia I of Albrecht Dürer.