Res Jost

Res Jost (10 January 1918 – 3 October 1990) was a Swiss theoretical physicist, who worked mainly in constructive quantum field theory.[1]

Res Jost
Res Jost, Copenhagen 1963
Born(1918-01-10)10 January 1918
Bern
Died3 October 1990(1990-10-03) (aged 72)
Zurich
NationalitySwiss
Alma materUniversity of Zurich
Scientific career
FieldsTheoretical physics
InstitutionsETH Zurich
Doctoral advisorGregor Wentzel
Doctoral studentsSergio Albeverio
Klaus Hepp
Walter Hunziker
Konrad Osterwalder
David Ruelle
Eduard Zehnder

Life and work

Jost studied in Bern and at the University of Zurich, where he received his doctorate in 1946 under Gregor Wentzel ("Zur Ladungsabhängigkeit der Kernkräfte in der Vektormesontheorie ohne neutrale Mesonen“). He then spent half a year with Niels Bohr in Copenhagen, where he introduced the "Jost function" into scattering theory. Afterwards, he worked as an assistant of Wolfgang Pauli in Zurich. From 1949 to 1955, in 1957, 1962/3 and 1968 he was at the Institute for Advanced Study in Princeton, where he worked with Walter Kohn, Joaquin Mazdak Luttinger and Abraham Pais among others. From 1955, he was extraordinary professor for theoretical physics at ETH and starting from 1959 professor. In 1964, he and Rudolf Haag created the journal "Communications in Mathematical Physics “.

Jost established at the ETH a school of mathematical physics. Among his graduate students were Sergio Albeverio (b. 1939), Klaus Hepp (b. 1936), Konrad Osterwalder, David Ruelle, Robert Schrader, Eduard Zehnder, Rudolf Seiler, Martin Kummer.

Jost researched quantum-mechanical scattering theory (also inverse scattering theory: Reconstruction of potentials from scattering data) and the mathematical quantum field theory, where he in 1958 with the methods of Arthur Strong Wightman proved the PCT theorem and in 1957 introduced the Jost - Lehmann - Dyson - representation [2] (an integral representation of the expectancy value of the commutator of two field operators). Jost was corresponding member Austrian Academy of Sciences and United States National Academy of Sciences. He received in 1984 the Max Planck medal.

Jost married Viennese physicist Hilde Fleischer in 1949. One of his leisure activities was mushroom growing.

Works
  • Jost: The general theory of quantized fields, AMS, 1965
  • Jost: Das Märchen vom Elfenbeinernen Turm. Reden und Aufsätze, Springer 1995 (Herausgegeben von Klaus Hepp, u.a. über Physikgeschichte bei Planck, Einstein, Faraday, Dirac, Mach, mit biographischer Note von Abraham Pais und Autobiographischem von Jost), ISBN 3-540-59476-0
gollark: Anyway, excluding the tensor cores and VRAM, standard colab's T4s are worse than a 1080 Ti. The K80 is worse than most recent things and you often get those now.
gollark: If you use it heavily you may as well just buy a P100 on eBay, they're "just" £600 or so now.
gollark: It's worse now! There's a Pro+ for 5 times as much and Pro people mostly get T4s.
gollark: 700-series, not 1000.
gollark: Fascinating.

References
  1. Kohn, Walter; Ruelle, David; Wightman, Arthur (February 1992). "Obituary: Res Jost". Physics Today. 45 (2): 120–121. doi:10.1063/1.2809552.
  2. Jost, Lehmann: Integral representation of causal commutators , Nuovo Cimento Vol. 5, 1957, p. 1598, extended by Dyson Physical Review Vol. 110, 1958, p. 1960

Sources
  • Abraham Pais: The Genius of Science, 2000.
  • Arthur Jaffe For Res Jost and to Arthur Wightman, Communications in Mathematical Physics, Bd.134, 1990, Heft 1 (Wightman on Jost and Jost on Wightman)
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