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Hugh Everett III

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Hugh Everett III was an influential American physicist. He is best known for proposing the relative state interpretation of quantum mechanics. This theory later became the foundation for the many-worlds interpretation (MWI). Quantum mechanics is the study of how the smallest particles in the universe behave. Most scientists believed that measuring a particle caused its wave function to collapse. A wave function is a mathematical description of all possible states a particle can have. Everett suggested a different process where the wave function never actually collapses.

Everett's mechanism changed how we view the act of observation. In standard theory, a particle exists in many states until someone looks at it. At that moment, the wave function is said to collapse into one single result. Everett proposed that the observer becomes part of the same quantum state as the observation. Instead of a collapse, the universal wave function undergoes a process called branching. This means every possible outcome of a quantum event actually occurs. The quantum statistic becomes a way to measure how the universal wave function branches into these different paths.

Everett's academic journey began in the Washington, D.C. area. He was born in 1930 and raised by his father and stepmother. At age twelve, he famously wrote a letter to Albert Einstein. He asked if the universe was governed by randomness or by something unifying. He later studied chemical engineering at the Catholic University of America. He graduated in 1953 after completing enough coursework for a mathematics degree as well. He then moved to Princeton University for graduate studies through a National Science Foundation fellowship.

At Princeton, Everett moved from mathematics into the field of physics. He studied under notable scientists like Robert Dicke and Eugene Wigner. He eventually switched his thesis advisor to John Archibald Wheeler. In April 1956, he completed his landmark paper, "Wave Mechanics Without Probability." This work was later retitled "The Theory of the Universal Wave Function." He defended his doctoral dissertation, "On the foundations of quantum mechanics," in April 1957. His examiners noted his high mathematical ability and his clear, logical way of expressing complex ideas.

Hugh Everett at New Mexico 1956 course attedence certicate
Hugh Everett at New Mexico 1956 course attedence certicate

Following his PhD, Everett transitioned from academia to commercial and defense work. He took a research job with the Pentagon in the Weapons Systems Evaluation Group (WSEG). He served as the director of the WSEG's Department of Physical and Mathematical Sciences in 1957. Much of his research during this time remained classified. He worked on projects regarding the Minuteman missile and the effects of nuclear fallout. In 1959, he and George E. Pugh published a study on nuclear weapon campaigns. This study was used by Nobel Peace Prize winner Linus Pauling to estimate potential casualties in a major nuclear war.

Despite his brilliance, Everett faced significant professional challenges. In 1956, he visited Copenhagen to meet Niels Bohr. Bohr was the father of the Copenhagen interpretation of quantum mechanics. The meeting was a failure because Bohr rejected Everett's approach entirely. Everett described the experience as "hell." His ideas were largely disregarded by the scientific community for many years. It was not until the 1970s, with the discovery of quantum decoherence, that his work gained credibility. In 1970, Bryce DeWitt helped popularize the theory by calling it the "many-worlds" interpretation.

Everett also showed a strong interest in mathematics and computing. He discovered a theorem in 1963 involving generalized Lagrange multipliers. This mathematical tool is used for optimization and helped him in his work as a consultant. He later founded the DBS Corporation in 1973. At his firm, he specialized in analyzing the socioeconomic effects of government programs. He also developed an early aptitude for computer programming. He favored using the TRS-80 computer for much of his later professional life. His work continues to connect the mathematical foundations of physics to our understanding of reality.

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