Документ взят из кэша поисковой машины. Адрес оригинального документа : http://theory.sinp.msu.ru/~iofa/cv.html
Дата изменения: Wed Jul 24 19:34:39 1996
Дата индексирования: Mon Oct 1 19:42:44 2012
Кодировка:

M.Z. Iofa Curriculum vitae.

CURRICULUM VITAE

Dr. M.Z.IOFA

NAME: Iofa Mikhail Zinovievich.

BIRTHDATE: May, 30, 1942.

CURRENT POSITION: Senior Research Scientist, Nuclear Physics Institute, Moscow State University, Moscow 119899, Russia.

DEGREE: Ph.D. in theoretical physics, 1969, from P.N.Lebedev Institute of Physics, Russian Academy of Sci.

EDUCATION: 1960-1966 (11 semesters) studies at the Department of Physics, Moscow State University. 1950-1960 10 years of school.

PROFESSIONAL EXPERIENCE: 1966-1969 Accociate research scientist at the I.E.Tamm Department of Theoretical Physics, P.N.Lebedev Institute of Physics.

1970-1976 Junior research scientist, Nuclear Physics Institute, Moscow State University.

1977-1985 Research scientist, Nuclear Physics Institute, Moscow State University.

1985-pres. Senior research scientist, Nuclear Physics Institute, Moscow State University.

RESEARCH ACTIVITY:

1994-present

Institute of Nuclear Physics

Moscow State University

Calculated string-loop corrections to string effective action (EA) and to solutions of beta-equations following from the loop-corrected EA. Investigated under what conditions string-loop corections can provide imaginary corrections to the tree-level EA which could account for instability of black- hole-like solutions. Imaginary contributions to EA can appear as a result of regularization of (exponentially) divergent integrals over the moduli. On the example of the 3D black string corresponding to SL(2,R)xR/R WZW model, using solution of one-loop-corrected beta-equations, ADM mass (per unit length) of of the black string was calculatrd. The ADM mass was found to be divergent, with the divergence being proportional to parameter accounting for admixture of genus one contribution. Redefining energy to obtain finite ADM mass, one obtains an expression independent of loop corrections. Similar results were obtained for 2D black-string solution. In superstring theory, imaginary corrections to solutions of beta equations do not appear also.

Refs. 39-42.

1988-1992

Institute of Nuclear Physics

Moscow State University

Examined BRST Ward Identities (WI) in path-integral and operator approaches to string theory and related problems. In the case of the standard conformal gauge, in path-integral approach, on string world sheets of higher genus, by direct calculation the WI were shown to be anomalous, the anomaly being due to noninvariance of the integration domain over the antighosts and auxiliary fields under the BRST transformations. The source of the anomaly was found in the reducibility of conformal gauge connected with Teichmuller deformations of the metric. Introducing 6g-6 extra ghosts and auxiliary fields to make the gauge condition irreducible, one obtains nonanomalous WI. The same phenomenon was studied for BRST quantization of the chiral model. Connection between complete and usually considered "truncated" BRST transformations was elucidated. In the latter case, the form of the anomaly as as a total derivative on the moduli space was explained. BRST WI were studied also for other gauges. In the case of irreducible conformal gauge, the BRST WI were shown to be non- anomalous. The same result was obtained for the superharmonic gauge in the superstring theory.

Refs. 27-35

1987-1988

Institute of Nuclear Physics

Moscow State University

Sigma-model approach to the effective off-shell string action was developed. Metric, dilaton and antisymmetric field beta functions were calculated in the two-loop approximation. It was shown that for parallelizable manifolds i.e. for manifolds with the vanishing Riemann tensor (with torsion) the beta functions vanish. Calculations required examination of divergencies of the relevant Feynman graphs and the use of identities for geometrical structures, which were proved for the case of locally symmetric spaces with covariantly constant torsion. In the case of nonlinear supersymmetric sigma model with the Wess-Zumino term parallelizability of the manifold was shown to be a consequence of current conservation.

Refs. 25,26

1983-1986

Institute of Nuclear Physics

Moscow State University

Phenomenological theory of hadron-nucleon and hadron-nucleus interactions at superhigh energies was developed. The main problem of the investigation was the study of Feynman scaling violation in the fragmentation region of the projectile hadron. Inclusive spectra on a nucleus with atomic number A (including A=1) were approximated by inclusive spectra on nuclei A1 and A2 at accelerator energies. To describe production processes the multi-component quasi-eikonal model was developed. Using the experimental data for inclusive spectra on nuclei at accelerator energies the scaling violation given by the ratio of the structure functions at high and accelerator energies was computed for pp->hX, pN(14)->hX, pFe(56)->hX reactions in the energy region 10**4-10**9 GeV for secondary protons and mesons with values of the Feynman parameter x in the interval .3-.8. The same calculations were made in the case of projectile meson. The model was shown to be consistent. Within experimental errors the effect was shown to be independent of the choice of the auxiliary nuclei A1 and A2. Theoretical results were compared with available accelerator and cosmic ray inclusive spectra and were shown to be in good agreement with experimental data.

Refs. 21-25.

1978-1982

Institute of Nuclear Physics

Moscow State University

Nonperturbative methods in quantum field theory were developed. The problems included (i) asymptotic estimates in perturbation theory, (ii) development of regular methods of calculation of the instanton-like contributions to the path integrals, (iii) development of methods of analytic continuation of the functional integrals to complex values of the coupling constant (complex instanton calculations), etc. Within the framework of this program, (complex) instanton contributions to the path integral for the partition function in the massless scalar field theory with quartic interaction were calculated. Regularization and renormalization of determinants resulting from integration over the quantum fluctuations were carefully examined. Related problems were discussed for the case of the one-dimensional quantum anharmonic oscillators. Closed expressions were obtained for the instanton contributions to the partition function at finite temperatures. Using explicit expressions, the problem of analytic continuation to complex values of the coupling constant, calculation of the instanton contributions to the path integral and related questions were examined. Special role of zero modes and quasi-zero modes in the case of multi-kink configurations was discussed.

Refs. 15-19.

1968-1971

P.N.Lebedev Institute of Physics.

Examined axiomatic formulation of quantum field theories. Developed Wightman formulation for the special case of nonlocal field theory (nonlocalizable theory) with the exponential growth of Wightman functions in momentum space. The theory was shown to retain a number of properties characteristic of local theories. Existence of the Jost points, equivalence of the weak local commutativity to the CPT invariance, existence of the asymptotic states was established. In a broad class of field theories (including the nonlocal theories) the Greenberg-Low-type bounds on the elastic amplitude were obtained by a new method within the framework of axiomatic formulation.

Refs. 4-9.
Full list of papers

Last update: July 22, 1996
iofa@theory.npi.msu.su