Paul Dirac

Paul Adrien Maurice Dirac, OM (August 8, 1902 – October 20, 1984) was a British theoretical physicist and a founder of the field of quantum physics.

Biography

Early years

Paul Dirac was born in the English city of Bristol. His father, Charles Dirac, was an immigrant from the Valais Canton in Switzerland who taught French for a living. His mother was originally from Cornwall and the daughter of a mariner. Paul had an elder brother and a younger sister. His early family life appears to have been unhappy on account of his father's unusually strict and authoritarian nature, but he never publicly expressed his feelings on the subject. He was educated first at Bishop Road Primary School and later at Merchant Venturers Technical College. The latter was an institution, attached to the University of Bristol, that emphasized scientific subjects and modern languages (an unusual arrangement at a time when secondary education in Britain was still dedicated largely to the classics, and something for which Dirac would later express gratitude).

Related Topics:
English - Bristol - Valais - Switzerland - French - Cornwall - University of Bristol - Britain - Classics

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Dirac studied electrical engineering at the University of Bristol, completing his degree in 1921. After working briefly as an engineer, Dirac decided that his true calling lay in the mathematical sciences. He completed a degree in mathematics at Bristol in 1923 and then received a grant to conduct research at St. John's College, Cambridge, where he would remain for most of his career. At Cambridge he became interested in the general theory of relativity and in the nascent field of quantum physics, and worked under the supervision of Ralph Fowler.

Related Topics:
Electrical engineering - University of Bristol - Mathematics - St. John's College, Cambridge - Cambridge - General theory of relativity - Quantum physics - Ralph Fowler

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Middle years

In 1926 he developed a version of quantum mechanics that incorporated the previous work of Werner Heisenberg on ?Matrix Mechanics? and of Erwin Schrödinger on ?Wave Mechanics? into a single mathematical formalism that associates measurable quantities with operators acting on the Hilbert space of vectors that describe the state of a physical system. For this seminal work he was awarded a Ph.D. from Cambridge.

Related Topics:
1926 - Quantum mechanics - Werner Heisenberg - Erwin Schrödinger - Hilbert space - Ph.D.

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In 1928, building on Pauli's work on nonrelativistic spin systems, he derived the Dirac equation, a relativistic equation describing the electron. This work led Dirac to predict the existence of the positron, the electron's antiparticle, which he interpreted in terms of what came to be called the Dirac sea. The positron was subsequently observed by Carl Anderson in 1932. Dirac also contributed to explaining the origin of quantum spin as a relativistic phenomenon.

Related Topics:
1928 - Pauli's - Dirac equation - Relativistic equation - Positron - Dirac sea - Carl Anderson - 1932 - Quantum spin

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Dirac's Principles of Quantum Mechanics, published in 1930, became one of the standard textbooks on the subject and is still used today. It introduced the Bra-ket notation, in which |?>, ket, denotes a state vector in the Hilbert space of a system and denotes an inner product. Dirac also introduced Dirac's delta function.

Related Topics:
1930 - Bra-ket notation - Hilbert space - Dirac's delta function

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In 1931 Dirac showed that the existence of a single magnetic monopole in the universe would suffice to explain the observed quantization of electrical charge. This proposal received much attention but there is to date no convincing evidence for the existence of magnetic monopoles.

Related Topics:
1931 - Magnetic monopole - Electrical charge

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Paul Dirac shared the Nobel Prize for physics in 1933 with Erwin Schrödinger "for the discovery of new productive forms of atomic theory." He married Eugene Wigner's sister, Margit in 1937.

Related Topics:
Nobel Prize - 1933 - Erwin Schrödinger - Eugene Wigner - 1937

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Later years

Dirac was Lucasian professor of mathematics at Cambridge from 1932 to 1969. The Dirac Prize is awarded in his honor. After having relocated to Florida in order to be near his married daughter, Dirac spent his last years at Florida State University (FSU) in Tallahassee, Florida. The Dirac-Hellman Award at FSU was endowed by Dr. Bruce Hellman (Dirac's last Ph.D. student) in 1997 to reward outstanding work in theoretical physics by FSU researchers.

Related Topics:
Lucasian professor - Cambridge - Dirac Prize - Florida State University - Tallahassee, Florida - Ph.D.

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Death and afterwards

He died in Tallahassee, where he is buried. In 1995, a plaque in his honor was unveiled at Westminster Abbey in London.

Related Topics:
1995 - Westminster Abbey - London

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