George Sudarshan

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George Sudarshan (2009)

Ennackal Chandy George Sudarshan (often ECG Sudarshan ; born September 16, 1931 in Pallam , Kottayam District , Kerala ; † May 14, 2018 in Texas ) was an Indian theoretical physicist .

Life

Sudarshan studied at Madras Christian College (1948–1951) and the University of Madras , where he made his master's degree in 1952 . From 1951 to 1955 he was at the Tata Institute of Fundamental Research with Homi Jehangir Bhabha . In 1955 he went to the University of Rochester in New York , where he received his doctorate in 1958 with Robert Marshak . He was then from 1957 to 1959 Corporation Fellow at Harvard University (with Julian Schwinger ), from 1959 Assistant Professor and from 1961 Associate Professor at Rochester University and from 1964 Professor at Syracuse University , where he was director of the research program for elementary particle physics . In 1962 he became a Fellow of the American Physical Society . From 1969 he was a professor at the University of Texas at Austin (1970 to 1991 director of the Center for Particle Theory) and from 1971 to 1991 senior professor at the Indian Institute of Science in Bangalore . During the 1980s he was also director of the Institute of Mathematical Sciences in Chennai for five years .

In 2007 he received the high Indian award Padma Vibhushan and in 1974 the Padma Bhushan . In 1970 he received the CV Raman Award, 1977, the Bose Medal, the 1986 Physics Prize of the Third World Academy of Sciences , 2006 the Majoranapreis and 2010 Dirac Medal of the University of New South Wales . He was a member of the Indian and Ukrainian Academy of Sciences and the Third World Academy of Sciences. He was multiple honorary doctor , u. a. the universities in Madras and Delhi.

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Sudarshan made fundamental contributions in several areas of physics. Independently of Richard Feynman and Murray Gell-Mann , he and Robert Marshak developed the VA theory of the weak interaction , which prepared the unified gauge theory of the electroweak interaction , and independently of Roy Glauber, the Sudarshan-Glauber representation of coherent waves in quantum optics . He was also one of the first to develop a theory of tachyons and, with Baidyanaith Misra, introduced the quantum Zeno effect . Sudarshan made numerous other contributions to mathematical physics , quantum field theory (including theories with indefinite metrics), the formalism of quantum mechanics and classical dynamics. For example, he gave new proofs of the spin statistics theorem , proved a theorem about the triviality of a Hamiltonian mechanics of a fixed number of particles in which the particles follow special-relativistic world lines, and dealt with the stochastic dynamics of (open) quantum mechanical systems (for Example in the measurement process or in the decay of a quantum mechanical state, quantum Zeno effect).

Sudarshan was also interested in Indian philosophy ( Vedanta ), on which he also gave lectures.

Fonts

  • with Robert Marshak: Introduction to Elementary Particle Physics . New York 1961
  • with John Klauder : Fundamentals of Quantum Optics . Benjamin 1968
  • with N. Mukunda: Classical Dynamics. A modern perspective . Wiley, 1976
  • with Tony Rothman: Doubt and Certainty . Perseus Books 1998
  • with Ian Duck: Pauli and the Spin-Statistics Theorem . World Scientific, 1998
  • with Giampiero Esposito and Giuseppe Marmo: From Classical to Quantum Mechanics. An Introduction to the Formalism, Foundations and Applications . Cambridge University Press, 2004

Web links

Individual evidence

  1. ^ Renowned physicist ECG Sudarshan, 86, dies ... manoramaonline.com, accessed May 14, 2018
  2. ^ Marshak and Sudarshan: Chirality invariance and the universal Fermi interaction . In: Physical Review . Volume 109, 1958, pp. 1860-1862, presented by Marshak at the Padua-Venice conference on mesons and newly discovered particles in November 1957 and distributed in a Rochester preprint. After Sudarshan he lectured on this in June 1957 in the presence of Gell-Mann in Santa Monica.
  3. Sudarshan: Equivalence of semi classical and quantum mechanical descriptions of statistical light beams . In: Physical Review Lettes . Volume 10, 1963, pp. 277-279
  4. In the Hindustan Times in 2007 Sudarshan expressed his disappointment at having been cheated out of the Nobel Prize twice ( Physicist cries foul over Nobel miss ( Memento of March 20, 2008 in the Internet Archive )). Sudarshan's letter to the Nobel Committee on the occasion of the award ceremony to Glauber: Sudarshan's letter, In: Frontline, Volume 22 (24), November / December 2005 ( Memento of September 27, 2007 in the Internet Archive ).
  5. ^ Sudarshan, Bilaniuk and Deshpande: Meta Relativity . In: American Journal of Physics . Volume 30, 1962, p. 718; The theory of particles traveling faster than light . In: Symposia on theoretical physics and mathematics . Volume 10, 1970; with Bilaniuk: Particles beyond the light barrier . In: Physics Today . Volume 22, 1969
  6. The Zenos Paradox in Quantum Theory . In: Journal of Mathematical Physics . Volume 18, 1977, p. 756. The effect consists in “freezing” the development of quantum mechanical systems, for example through frequent observation
  7. ↑ e.g. Proceedings Nobel Symposium 1968
  8. ^ Sudarshan, Currie and Jordan: Relativistic Invariance and Hamiltonian Theory of interacting particles . In: Reviews of Modern Physics . Volume 35, 1963, p. 350. "Trivial" means that they cannot interact.
  9. ^ B. Misra and ECG Sudarshan: The Zeno's paradox in quantum theory. J. Math. Phys. 18, 756-763 (1977)