The God has created a man in order that he creates that the God fails to do

Monday, 22 September 2014

SUSY gauge theory on graded manifolds

Our article: G. Sardanashvily, W. Wachowski, SUSY gauge theory on graded manifoldsarXiv: 1406.6318

Lagrangian classical field theory of even and odd fields is adequately formulated in terms of fibre bundles and graded manifolds. In particular, conventional Yang-Mills gauge theory is theory of connections on smooth principal bundles, but its BRST extension involves odd ghost fields an antifields on graded manifolds. Here, we formulate Yang-Mills theory of Grassmann-graded gauge fields associated to Lie superalgebras on principal graded bundles. A problem lies in a geometric definition of odd gauge fields. Our goal is Yang--Mills theory of graded gauge fields and its BRST extension.

Conventional Yang–Mills theory of classical gauge fields is adequately formulated as Lagrangian theory of principal connections on smooth principal bundles. Here, we aim to develop Yang–Mills theory of Grassmann-graded even and odd gauge fields associated to Lie superalgebras which characterize various SUSY extensions of Standard Model. A key point is the geometric description of odd gauge fields. A main contradiction is that gauge fields are affine objects, whereas odd fields are linear. A problem also lies in definition of odd fields and their jets.

Wednesday, 17 September 2014

Who is who among universities in 2014

New world ranking of universities QS World University Rankings 2014/15 has been published. It contains 901 universities.

The top ten positions are occupied by 6 universities of USA and 4 of United Kingdom.

In the top twenty: 11 - USA, 6 - United Kingdom, 2Switzerland, 1 -  Canada.

In the first 50 Universities: 18 – USA; 8 - United Kingdom; 5 – Australia, 4 - China (including 3 of Hong-Kong ); 3 – Canada;  2 – Switzerland, France, Japan and Singapore; 1 – Germany, Netherlands, Denmark and Korea.

See (#) for the rankings of Russian universities.

Friday, 12 September 2014

Dmitri Ivanenko (in honor of the 110th year anniversary)

My article "Dmitri Ivanenko" (in honor of the 110th year anniversary), Science Newsletter, Issue 1 (2014) 16-17, has been published (#) (see its text below) and has been reproduced in arXiv: 1607.03828

Dmitri Ivanenko (29.07.1904 – 30.12.1994), professor of Moscow State University, was one of the great theoreticians of XX century, an author of the proton-neutron model of atomic nucleus (1932).

D. Ivanenko was born on July 29, 1904 in Poltava (Russian Empire), where he began his creative path as a school teacher of physics. In 1923 Ivanenko entered Petrograd University. In 1926, while still a student, he wrote first scientific works with his friends George Gamov and Lev Landau (Nobel Laureate in 1962). After graduating the university, from 1927 to 1930 D. Ivanenko was a scholarship student and a researcher scientist at the Physical Mathematical Institute of Academy of Sciences of USSR. During these years he collaborated with Vladimir Fok and Viktor Ambartsumian, later to become famous.

In 1929 – 31, Dmitri Ivanenko worked at the Kharkiv Institute of Physics and Technology, being the first director of its theoretical division; Lev Landau followed him in 1932 – 37. Paskual Jordan, Victor Wieskopf, Felix Bloch (Nobel laureate in 1952) and Paul Dirac (Nobel Laureate in 1933) visited D. Ivanenko in Kharkiv. In Kharkiv, Ivanenko organized the 1st Soviet theoretical conference (1929) and the first soviet journal "Physikalische Zeitschrift der Sowjetunion" in foreign language (1932).

After returning to Leningrad at the Ioffe Physical-Technical Institute, D. Ivanenko concentrated his interest to nuclear physics. In May 1932, Ivanenko published the proton-neutron model of the atomic nucleus in “Nature”, and two months later Werner Heisenberg (Nobel laureate in 1932) referred to his work. In August 1932, D. Ivanenko and E. Gapon proposed the pioneer nuclear shell model describing the energy level arrangement of protons and neutrons in the nucleus in terms of energy levels. Later this model was developed by Eugene Paul Wigner, Maria Goeppert-Mayer and J. Hans D. Jensen who shared the 1963 Nobel Prize for their contributions.

Ivanenko’s success pushed forward the nuclear physics in the USSR. In 1933 on the initiative of Dmitri Ivanenko and Igor Kurchatov, the 1st Soviet nuclear conference was organized. Paul Dirac, Frédéric Joliot-Curie (Nobel laureate in 1935), Fransis Perrin, Ftanko Rasetti, Victor Wieskopf et al participated in this Conference.

The realization of Ivanenko's far-reaching plans and hopes was interrupted, however. In 1935 he was arrested in connection with the Sergey Kirov affair. Exile to Tomsk followed. D. Ivanenko was a professor at Tomsk and Sverdlovsk Universitie until the beginning of the World War II. From 1943 and until the last days of his life, he was closely associated with the Physics Faculty of M.V. Lomonosov Moscow State University.
Dmitri Ivanenko made the fundamental contribution to many areas of nuclear physics, field theory and gravitation theory.

In 1928, Ivanenko and Landau developed the theory of fermions as skew-symmetric tensors in contrast with the Dirac spinor model. Their theory, widely known as the Ivanenko -- Landau – Kahler theory, is not equivalent to Dirac's one in the presence of a gravitational field, and only it describes fermions in contemporary lattice field theory.

In 1929, Ivanenko and Fock generalized the Dirac equation and described parallel displacement of spinors in a curved space-time (the famous Fock – Ivanenko coefficients). Nobel laureate Abdus Salam called it the first gauge field theory.

In 1930, Ambartsumian and Ivanenko suggested the hypothesis of creation and annihilation of massive particles which became the corner stone of contemporary quantum field theory.

In 1934 Dmitri Ivanenko and Igor Tamm (Nobel Laureate in 1958) suggested the first non-phenomenological theory of paired electron-neutrinor nuclear forces. They made the significant assumption that interaction can be undergone by an exchange of massive particles. Based on their model, Nobel laureate Hideki Yukawa developed his meson theory.

In 1938, Ivanenko proposed a non-linear generalization of Dirac's equation. Based on this generalization, W. Heisenberg and he developed the unified nonlinear field theory in 50th.

In 1944, Dmitri Ivanenko and Isaak Pomeranchuk predicted the phenomenon of synchrotron radiation given off by relativistic electrons in a betatron. This radiation was soon discovered by American experimenters D. Bluitt (1946) and H. Pollock (1947). Synchrotron radiation possesses a number of very particular properties which provide its wide applications. In particular, neutron stars also are sources of this type radiation. Classical theory of synchrotron radiation was developed by Dmitri Ivanenko in collaboration with Arseny. Sokolov in 1948, and independently by Julian Schwinger (Nobel Laureate in 1965). For their work on synchrotron radiation, D. Ivanenko, A. Sokolov and I. Pomeranchuk were awarded the Stalin Prize in 1950.

Two of D. Ivanenko's and A. Sokolov's monographs "Classical Field Theory" and "Quantum Field Theory" were published at the beginning of the 50th. “Classical field theory” was the first contemporary book on field theory where, for instance, the technique of generalized functions was applied. Nobel laureate Ilya Prigogine referred to it as his text-book.

In 1956, D. Ivanenko developed the theory of hypernuclei discovered by Marian Danysz and Jerzy Pniewski in 1952.

At the beginning of the 1960's, D. Ivanenko did intensive scientific and organizational work on the development and coordination of gravitation research in the USSR. In 1961, on his initiative the 1st Soviet gravitation conference was organized. D. Ivanenko was the organizer of Soviet Gravitation Commission, which lasted until the 1980's. He was a member of the International gravitation Committee since its founding in 1959. In the 70 – 80th, D. Ivanenko was concentrated on gravitation theory. He developed different generalizations of Einstein's General Relativity, including gravity with torsion and gauge gravitation theory. In 1985, D. Ivanenko and his collaborators published two monographs "Gravitation" and "Gauge Gravitation Theory".

Theoretical physics in the USSR has been enormously influenced by the seminar on theoretical physics organized by D. D. Ivanenko in 1944 that has continued to meet for 50 years under his guidance at the Physics Faculty of Moscow State University. The distinguishing characteristic of Ivanenko's seminar was the breadth of its grasp of the problems of theoretical physics and its discussion of the links between its various divisions, for example, gravitation theory and elementary particle physics. The most prominent physicists in the world participated in the seminar: Niels and Aage Bohr, Paul Dirac, Hideki Yukawa, Julian Schwinger, Abdus Salam, Ilya Prigogine, Samuel Ting, Paskual Jordan, Tullio Regge, John Wheeler, Roger Penrose et al.

The scientific style of Dmitri Ivanenko was characterized by great interest in ideas of frontiers in science where these ideas were based on strong mathematical methods or experiment.
It should be noted that seven Nobel Laureates: P.A.M. Dirac, H. Yukawa, N.Bohr, I. Prigogine, S. Ting, M. Gell-Mann, G. 't Hooft wrote their famous inscriptions with a chalk on the walls of Ivanenko's office in Moscow State University.