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Hagen KleinertTheoretical physicist, professor
Date of Birth: 15.06.1941
Country:  Germany |
Content:
- Biographer's Note
- Early Life and Education
- Academic Career
- Collaboration with Richard Feynman
- Pioneering Research
- Published Works
- Theoretical Contributions
Biographer's Note
Professor Hartmut K. Kleinert is a distinguished physicist and author known for his significant contributions to various fields of theoretical physics.
Early Life and Education
Kleinert embarked on his academic journey at the Technical University of Hanover in 1960, subsequently studying at various universities in the United States. He obtained his doctorate in philosophy from the University of Colorado in 1967.
Academic Career
Professorship at Freie Universität BerlinIn 1969, Kleinert became a professor at Freie Universität Berlin. Throughout his esteemed career, he has held visiting professorships at the European Centre for Nuclear Research (Geneva) and several American universities, including Berkeley, Santa Barbara, San Diego, Santa Cruz, and the Los Alamos National Laboratory.
Collaboration with Richard Feynman
A pivotal encounter with Richard Feynman in 1972 at Caltech marked a turning point in Kleinert's research. Feynman introduced him to the application of path integrals in quantum mechanics, leading to the development of variational perturbation theory.
Pioneering Research
Kleinert's pioneering work laid the foundation for variational perturbation theory, which has proven invaluable in accurately calculating critical indices near second-order phase transitions (demonstrated experimentally for superfluid helium).
Published Works
Books- "Gauge Fields in Condensed Matter Physics" (in two volumes)
- "Continuum Integrals in Quantum Mechanics, Statistics, Polymer Physics, and Financial Marketing"
Theoretical Contributions
- Mathematical physics- Elementary particle physics
- Nuclear physics
- Condensed matter physics
- Liquid crystals
- Biomembranes
- Microemulsions
- Polymers
- Financial market theory
Legacy
Kleinert's numerous publications, including over 370 articles, have shaped the understanding of complex physical phenomena. His groundbreaking field theory for phase transitions elucidated the statistical fluctuations of vortices and defects using Feynman diagrams. Notably, his prediction of a critical point on the phase curve for superconductivity was confirmed by Monte Carlo simulations in 2002.
