Harry Lehmann (physicist)

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Harry Lehmann (born March 21, 1924 in Güstrow ; † November 22, 1998 in Hamburg ) was a German physicist .

life and work

After graduating from high school in Rostock in 1942, Lehmann did his military service in North Africa, where he was also taken prisoner and spent three years in a US prison camp. From 1946 he studied physics in Rostock and later at the Humboldt University in Berlin (diploma in experimental physics). He received his doctorate in 1950 under Friedrich Hund in Jena (on a topic of classical electrodynamics), whose assistant he was. In 1952 he came to the then Max Planck Institute for Physics in Göttingen (at the invitation of Werner Heisenberg ), also worked for a year in Copenhagen (as a member of the CERN Study Group), and finally accepted a professorship in Hamburg in 1956 (successor to Wilhelm Lenz ). In Hamburg he played a central role in setting up the German Electron Synchrotron , especially in founding the theoretical institute.

Harry Lehmann was a pioneer of quantum field theory (QFT); in the 1950ern he published, mostly in collaboration with Kurt Symanzik and Wolfhart Zimmermann , fundamental work on QFT, best known the LSZ reduction formula for calculating the S matrix in 1955. This work has gone beyond the original objective in the entire theoretical Physics proved fruitful, e.g. B. in the theory of the so-called " linear response " with various derivations of the " fluctuation-dissipation theorem ". Independently of Gunnar Källén , he developed a spectral representation of propagators in quantum field theories, the Källén-Lehmann representation .

Harry Lehmann received the Max Planck Medal of the German Physical Society in 1967 and the Dannie Heineman Prize for Mathematical Physics from the American Physical Society in 1997 .

His doctoral students include Klaus Pohlmeyer and Bert Schroer .


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