Хаген Кляйнерт: Немец физигі, ғылыми еңбектері мен жетістіктері

German physicist

Hagen Kleinert (born 15 June 1941) is professor of theoretical physics at the Free University of Berlin, Germany (since 1968),
Honorary Doctor at the
West University of Timișoara, and
at the
Kyrgyz Russian Slavic University
in Bishkek. He is also
Honorary Member of the
Russian Academy of Creative Endeavors. For his contributions to particle and solid state physics he was awarded the Max Born Prize 2008 with Medal. His contribution to the memorial volume celebrating the 100th birthday of Lev Davidovich Landau earned him the Majorana Prize 2008 with Medal. He is married to Dr. Annemarie Kleinert since 1974 with whom he has a son Michael Kleinert.

Kleinert has written ~420 papers on mathematical physics and the physics of elementary particles, nuclei, solid state systems, liquid crystals, biomembranes, microemulsions, polymers, and the theory of financial markets. He has written several books on theoretical physics, the most notable of which, Path Integrals in Quantum Mechanics, Statistics, Polymer Physics, and Financial Markets, has been published in five editions since 1990 and has received enthusiastic reviews.

He studied physics at the Leibniz University Hannover between 1960 and 1963, and at several American universities including Georgia Institute of Technology, where he learned general relativity as a graduate student from George Gamow, one of the fathers of the Big Bang theory. Kleinert earned his doctorate in 1967 at the University of Colorado, Boulder.

Together with A. Chervyakov, Kleinert developed an extension of the theory of distributions from linear spaces to semigroups by defining their products uniquely (in the mathematical theory, only linear combinations are defined). The extension is motivated by the physical requirement that the corresponding path integrals must be invariant under coordinate transformations, which is necessary for the equivalence of the path integral formulation to Schrödinger theory.

As an alternative to string theory, Kleinert used the complete analogy between non Euclidean geometry and the geometry of crystals with defects to construct a model of the universe called the World Crystal or Planck Kleinert crystal. In this model, matter creates defects in spacetime which generate curvature. This curvature reproduces all the effects of general relativity, but leads to different physics than string theory at the scale of the Planck length. This theory inspired Italian artist Laura Pesce to create glass sculptures entitled "world crystal" (see also lower left on this page).

Kleinert is a senior member of the faculty for the International Relativistic Astrophysics PhD (IRAP) Project, which forms part of the international network for astrophysics (ICRANet). He was also involved in the European Science Foundation's project Cosmology in the Laboratory. Kleinert's 60th birthday was honored by a Festschrift and a Festcolloquium with 65 contributions by international colleagues (for instance Y. Ne'eman, R. Jackiw, H. Fritzsch, R. Ruffini, C. DeWitt, L. Kauffman, J. Devreese, and K. Maki).