Klaus Fredenhagen

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Klaus Fredenhagen
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Born(1947-12-01)1 December 1947
Celle, Germany
Alma materUniversity of Hamburg
Scientific career
InstitutionsUniversity of Hamburg
ThesisDie Quantenelektrodynamik mit einem Freiheitsgrad fuer das Photonfeld (1976)
Doctoral advisor
  • Gert Roepstorff
  • Rudolf Haag

Klaus Fredenhagen (born 1 December 1947) is a German theoretical physics|theoretical physicist who works on the mathematical foundations of quantum field theory.[1]


Klaus Fredenhagen was born on 1 December 1947 in Celle, a German city in Lower Saxony. He graduated in 1976[2] from the University of Hamburg under the supervision of Gert Roepstorff and Rudolf Haag. In 1985 he became a privatdozent and in 1990 a full professor at the second theory institute of the Hamburg University.[3] Since 2013 he has been a professor emeritus and has continued to be active in research.[4]

Scientific career

His research interests are algebraic quantum field theory and quantum field theory in curved spacetime. In 1981 he proved the existence of antiparticles in massive quantum field theories without using the CPT symmetry. In 1990 he and Rudolf Haag made important contributions to the understanding of the Hawking radiation of black holes on a rigorous mathematical footing. In 1994, together with Sergio Doplicher and John E. Roberts, he investigated the mathematical foundations of quantum gravity in terms of the quantum structure of spacetime at the Planck scale. In 1996, together with Romeo Brunetti, he started working on the generalization of the Epstein-Vladimir Jurko Glaser|Glaser renormalization procedure of interacting quantum field theories in curved spacetime using techniques from the microlocal analysis.[5] He is currently working, together with Detlev Buchholz, on a new C*-algebra|C*-algebraic approach to interacting quantum field theories.

Honors and awards

In 1987 Klaus Fredenhagen was awarded the physics prize of the Göttingen Academy of Sciences[6] and in 1997 he was Leibniz Professor[7] at the University of Leipzig.[8] In December 2017 the workshop Quantum Physics meets Mathematics was held in honor of his 70th birthday at the University of Hamburg.[9]


  1. "Klaus Fredenhagen personal homepage". Hamburg University. Retrieved March 28, 2021.
  2. The doctoral thesis is Fredenhagen, Klaus (1976). Die Quantenelektrodynamik mit einem Freiheitsgrad für das Photonfeld (Thesis) (in Deutsch). Hamburg.
  3. He was the successor of Rudolf Haag's chair, who retired in 1987. See e.g. the historical overview "About the Theoretical Physics Institute II". Hamburg University. Retrieved March 29, 2021.
  4. "Fredenhagen, Klaus". Hamburg University (in Deutsch). Retrieved March 29, 2021.
  5. Khavkine, Igor; Moretti, Valter (2015). "Algebraic QFT in Curved Spacetime and Quasifree Hadamard States: An Introduction". In Brunetti, Romeo; Dappiaggi, Claudio; Fredenhagen, Klaus; Yngvason, Jakob (eds.). Advances in Algebraic Quantum Field Theory. Mathematical Physics Studies. Springer International Publishing. pp. 191–251. doi:10.1007/978-3-319-21353-8. ISBN 978-3-319-21352-1.
  6. "Physics prize winners". Göttingen Academy of Sciences (in Deutsch). Retrieved March 30, 2021.
  7. The Leibniz Professorship is one of the highest honor awarded by the University of Leipzig and it is granted every semester since 1994. See "Leibniz Professorship". Leipzig University. Retrieved March 29, 2021.
  8. "Leibniz Alumni". Leipzig University. Retrieved March 29, 2021.
  9. "Quantum Physics meets Mathematics - a workshop on the occasion of Klaus Fredenhagen's 70th birthday". Local Quantum Physics Crossroads. Retrieved March 28, 2021.

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