Arnold Nordsieck
| Arnold Nordsieck | |
|---|---|
| Born |
5 January 1911 Brooklyn, New York |
| Died | 18 January 1971 (aged 60) Santa Barbara, California |
| Nationality | English |
| Institutions |
Columbia University Bell Telephone Laboratories University of Illinois at Urbana-Champaign General Research Corporation |
| Alma mater |
University of California, Berkeley (Ph.D., 1935) Columbia University (M.S., 1932) |
| Thesis | Scattering of Radiation by an Electric Field (1935) |
| Doctoral advisor | Robert Oppenheimer |
| Known for | Bloch-Nordsieck cancellation of infrared divergences |
Arnold Theodore Nordsieck (5 January 1911 – 18 January 1971) was an American theoretical physicist. He is best known for his work with Felix Bloch on the infrared problem in quantum electrodynamics. He developed the inertial electrostatic gyroscope (ESG) used as part of the inertial navigation system of nuclear submarines that allows them to remain underwater without having to surface to ascertain their location.
Arnold Theodore Nordsieck was born in Marysville, Ohio, on 5 January 1911. He entered Ohio State University, where he earned a M.S. degree in physics in 1932. He then went to the University of California, Berkeley, where he wrote his 1935 doctoral dissertation under the supervision of Robert Oppenheimer on the "Scattering of Radiation by an Electric Field".
A National Research Council fellowship allowed Nordsieck to travel to Germany in 1935 as a post-doctoral researcher at the University of Leipzig under Werner Heisenberg. With Felix Bloch he solved the infrared problem in quantum electrodynamics, the problem of differences in the scattering amplitudes for example in the bremsstrahlung, which had its origin in the vanishing rest mass of the photon. Bloch and Nordsieck showed that this due to the perturbation theory used, and were able to avoid it with a better method.
Returning to the United States in 1937, Nordsieck taught physics at Columbia University, where he conducted research into theoretical physics and microwave radiation. In 1942, he became a researcher at the Bell Telephone Laboratories. He was also an associate professor at Columbia from 1945 to 1946. From 1947 to 1961 he was a professor at the University of Illinois at Urbana-Champaign, where his doctoral students there included Erwin Hahn.
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