Isaak Markovich Khalatnikov (born 17.10.1919) — Soviet theoretical physicist, a corresponding member of the USSR Academy of Sciences (1972). Born in Dnepropetrovsk. Graduated from Dnepropetrovsk University (1941). In 1945 — 65 he worked at the Institute for Physical Problems of the USSR Academy of Sciences. Since 1965 he has been director of the Institute of Theoretical Physics of the USSR Academy of Sciences, and since 1954 also a professor at the Moscow Institute of Physics and Technology.
His research concerned the theory of quantum liquids, superconductivity, quantum electrodynamics, quantum field theory, relativistic hydrodynamics, quantum mechanics, relativistic cosmology and general relativity. He developed the hydrodynamics and the theory of kinetic phenomena in a superfluid liquid and in quantum liquids of the Fermi type. He posed and solved the question of the asymptotic behaviour of the basic quantities of field theory (the Green's functions of the electron and the photon) at large values of momenta, and developed an original method of summing an infinite sequence of Feynman diagrams, which later found wide applications in statistical physics. He investigated the question of the existence and properties of a time singularity in the general cosmological solutions of Einstein's equations in the theory of gravitation.
USSR State Prize (1953). L. D. Landau Prize (1974).