Einstein, Albert

The Columbia Encyclopedia, 6th ed.

Einstein, Albert

Albert Einstein (īn´stīn), 1879–1955, American theoretical physicist, known for the formulation of the relativity theory, b. Ulm, Germany. He is recognized as one of the greatest physicists of all time.

Life

Einstein lived as a boy in Munich and Milan, continued his studies at the cantonal school at Aarau, Switzerland, and was graduated (1900) from the Federal Institute of Technology, Zürich. Later he became a Swiss citizen. He was examiner (1902–9) at the patent office, Bern. During this period he obtained his doctorate (1905) at the Univ. of Zürich, evolved the special theory of relativity, explained the photoelectric effect, and studied the motion of atoms, on which he based his explanation of Brownian movement. In 1909 his work had already attracted attention among scientists, and he was offered an adjunct professorship at the Univ. of Zürich. He resigned that position in 1910 to become full professor at the German Univ., Prague, and in 1912 he accepted the chair of theoretical physics at the Federal Institute of Technology, Zürich.

By 1913 Einstein had won international fame and was invited by the Prussian Academy of Sciences to come to Berlin as titular professor of physics and as director of theoretical physics at the Kaiser Wilhelm Institute. He assumed these posts in 1914 and subsequently resumed his German citizenship. For his work in theoretical physics, notably on the photoelectric effect, he received the 1921 Nobel Prize in Physics. His property was confiscated (1934) by the Nazi government because he was Jewish, and he was deprived of his German citizenship. He had previously accepted (1933) a post at the Institute for Advanced Study, Princeton, which he held until his death in 1955. An ardent pacifist, Einstein was long active in the cause of world peace; however, in 1939, at the request of a group of scientists, he wrote to President Franklin Delano Roosevelt to stress the urgency of investigating the possible use of atomic energy in bombs. In 1940 he became an American citizen.

Major Contributions to Science

The Special and General Theories of Relativity

Einstein's early work on the theory of relativity (1905) dealt only with systems or observers in uniform (unaccelerated) motion with respect to one another and is referred to as the special theory of relativity; among other results, it demonstrated that two observers moving at great speed with respect to each other will disagree about measurements of length and time intervals made in each other's systems, that the speed of light is the limiting speed of all bodies having mass, and that mass and energy are equivalent. In 1911 he asserted the equivalence of gravitation and inertia, and in 1916 he completed his mathematical formulation of a general theory of relativity that included gravitation as a determiner of the curvature of a space-time continuum. He then began work on his unified field theory, which attempts to explain gravitation, electromagnetism, and subatomic phenomena in one set of laws; the successful development of such a unified theory, however, eluded Einstein.

Photons and the Quantum Theory

In addition to the theory of relativity, Einstein is also known for his contributions to the development of the quantum theory. He postulated (1905) light quanta (photons), upon which he based his explanation of the photoelectric effect, and he developed the quantum theory of specific heat. Although he was one of the leading figures in the development of quantum theory, Einstein regarded it as only a temporarily useful structure. He reserved his main efforts for his unified field theory, feeling that when it was completed the quantization of energy and charge would be found to be a consequence of it. Einstein wished his theories to have that simplicity and beauty which he thought fitting for an interpretation of the universe and which he did not find in quantum theory.

Writings

Einstein's writings include Relativity: The Special and the General Theory (1918; tr. 1920, reissued 1947) and excerpts (most of them translated) from letters, articles, and addresses collected in About Zionism (1930), The World as I See It (1934), Out of My Later Years (1950), Ideas and Opinions (1954), and Einstein on Peace (ed. by Otto Nathan and Heinz Norden, 1960). Einstein's manuscripts and correspondence are presently at the Institute for Advanced Study, Princeton. The first volume of an edition of his collected works, under the editorship of John Stachel et al., appeared in 1987.

Bibliography

See the Born-Einstein letters, ed. by M. Born (tr. 1971); biographies by R. W. Clark (1971, repr. 1991), B. Hoffmann (with H. Dukas, 1972, repr. 1989), J. Bernstein (1973, repr. 1997), A. Pais (1982), M. White and J. Gribbin (1995), D. Brian (1997), A. Folsing (1998), W. Isaacson (2007), and J. Neffe (2007); studies by P. A. Schilpp, ed. (1949, repr. 1973), M. Born (rev. ed. 1962), C. Lanczos (1965), A. J. Friedman and C. Donley (1989), D. Howard and J. Stachel (1989), A. Pais (1994), D. Overbye (2000), and Z. Rosenkranz (2011).

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