Issue 3, 1990
Generalized Pauli-Willars regularization and the stochastic quantization method
Generalized Pauli-Willars regularization and the stochastic quantization method
M.S. Imashev, D.A. Slavnov
The paper considers the possibility of applying the generalized Pauli-Willars regularization, with an additional condition imposed on the logarithms of auxiliary masses, to eliminate the ultraviolet divergence of correlation functions in the case of stochastic quantization of a scalar field. The equivalence of probability distributions in the regularized stochastic theory and in the Euclidean quantum field theory is established.
Show AbstractStochastic quantization of gravity
Stochastic quantization of gravity
Yu.V. Kuz'min
A method of stochastic quantization is proposed for field theories with indefinite Euclidean action, based on the introduction of a nonlocal kernel of a special form in the generalized Langevin equation. The method is applied to stochastic quantization of gravitation theories with Einstein's Lagrangian and of the $R^2$ gravity.
Show AbstractUltraviolet finiteness of the Wess-Zumino-Witten gauge model on homogeneous manifolds
Ultraviolet finiteness of the Wess-Zumino-Witten gauge model on homogeneous manifolds
V.V. Belokurov, P.M. de Barrush Pasheku Seara de Sa
In the nonlinear two-dimensional model, whose action is the sum of actions of two Wess-Zumino-Witten models and of the interaction of a special kind between them, the classical energy-momentum tensor is expressed in terms of conserved currents. For the Virasoro algebra generated by the tensor to have a constant central charge in quantum theory, it is required that the theory by finite. It is shown by means of an explicit calculation of one- and two-loop counterterms that this is the case only for a special choice of parameters for which the model is gauge-invariant and is defined on a homogeneous space.
Show AbstractAxigluonic decay of quarkonium in the chiral color model
Axigluonic decay of quarkonium in the chiral color model
R.N. Faustov, I.G. Vasilevskaya
The chiral color model predicts the existence of axigluons, i.e. a color octet of massive axial-vector gauge bosons. In this connection, of interest in the decay of quarkonium into a gluon and a virtual axigluon, the latter disintegrating into a quark-antiquark pair. In this study, an expression has been found for the decay width of quarkonium S states. Calculations have been carried out for charmonium $J/\Psi$ and bottomonium $\Upsilon$ for different values of the axigluon mass.
Show AbstractOn polarization effects in Cerenkov radiation
On polarization effects in Cerenkov radiation
I.M. Ternov, V.Ch. Zhukovskii, A.V. Borisov, A.H. Moussa
An expression for the Cerenkov radiation power with consideration for the arbitrary electron and photon polarization is obtained which generalizes the results of previous studies. Various special cases are investigated. The polarization vector of the final electron is found, which is determined by the initial polarization and electron and photon momenta.
Show AbstractMagnetic insulation in two-electrode systems with rectilinear generators
Magnetic insulation in two-electrode systems with rectilinear generators
O.I. Vasilenko
Within the framework of single-velocity cold hydrodinamics, magnetic insulation in two-electrode systems of arbitrary cross-section is described for the case when the generators of the electrodes are parralel straight lines or straight lines intersecting at one point.
Show AbstractInvestigation of radial distribution of the current density for the tubular relativistic electron beam in the transport channel
Investigation of radial distribution of the current density for the tubular relativistic electron beam in the transport channel
A.F. Aleksandrov, V.L. Vesnin, S.Yu. Galuzo, V.A. Kubarev, V.V. Mikheev, V.A. Pletyushkin, V.Yu. Sergienko
Variations of the radial profile of the current density for the tubular relativisttic electron beam (REB) in a long vacuum channel have been studied with the help of the sectional collector. In the experiments, the REB wall thickness was observed to increase with an increase in the transport channel length and a decrease in the guiding magnetic field. It has been shown that when a certain critical value of the magnetic field strength is exceeded, the REB wall thickness ceases to change along the drift channel length. The results obtained agree with the estimates made according to the theory of diocotron instability.
Show AbstractThe effect of cross-modulation on free carriers in semiconductors for laser diagnostics of high-power SHF radiations
The effect of cross-modulation on free carriers in semiconductors for laser diagnostics of high-power SHF radiations
A.V. Kozar', S.A. Krupenko
Simultaneous action of the continuous SHF and IR radiations affects the reflection coefficients of crystalline silicon due to alterations of both the temperature of the sample and the mobility and concentration of free charge carriers. Some theoretical and experimental results, as well as prospects for applying the effect in scientific studies, are considered.
Show AbstractAn opto-acoustic study of the absorption of radiation by rough surfaces
An opto-acoustic study of the absorption of radiation by rough surfaces
A.A. Benditskii, A.A. Karabutov, I.A. Kudinov, V.T. Platonenko, M.A. Sogoyan, A.V. Chugunov
Absorption of radiation in the medium IR range by a periodic-profile metal surface has been investigated. The absorbed energy was measured by means of the opto-acoustic effect. Sharp and narrow absorption peaks were observed at light incidence angles corresponding to resonance excitation of surface electromagnetic waves by scattered radiation. A method of determining surface roughness and angular spectrum of laser radiation is proposed.
Show AbstractEfficiency of integral phase approximation of light beams in adaptive focusing systems
Efficiency of integral phase approximation of light beams in adaptive focusing systems
F.Yu. Kanev, E.A. Lipunov, S.S. Chesnokov
Algorithms of reproduction of a specified phase profile of a light beam by an elastic mirror have been considered. An effective procedure of phase approximation has been proposed based on the method of least squares and allowing the first- and second-order phase surfaces to be specified with a high accuracy using a small number of control channels. The effect of the phase corrector parameters on the quality of adaptive focusing in linear and nonlinear media has been analyzed on the basis of a numerical model of the adaptive mirror.
Show AbstractOptimization of resonators in solid-state ring lasers with end pumping
Optimization of resonators in solid-state ring lasers with end pumping
V.V. Dedysh, V.E. Nadtotcheev, O.E. Nanii
A solution has been found to the problem of selecting optimum parameters of the resonator and the pumped region in a solid-state ring laser with monochromatic end pumping with allowance for a non-uniform amplification and also for the astigmatism of the mirrors and other components of the resonator. It is demonstrated that the minimum lasing thresholds can be achieved through the use of resonators which are equivalent to a concentric resonator, with compensation for the mirrors' astigmatism. A method for calculating the optimum size of the pumped region is given.
Show AbstractAcoustic diffraction tomography of boundary scatterers
Acoustic diffraction tomography of boundary scatterers
V.A. Burov, A.V. Glazkov, I.P. Prudnikov, O.D. Rumyantseva, E.Ya. Tagunov
An approach to the solution of tomographic inverse problem of scattering by boundary acoustic inhomogeneities is briefly described using the extrapolated Richardson method. Results of the experimental verification of the theory that has been developed are presented.
Show AbstractOn destruction and dissipation of long waves on a shelf
On destruction and dissipation of long waves on a shelf
S.A. Arsenyev, A.Yu. Gubar', N.K. Shelkovnikov
The paper considers the problems of calculating nonlinear processes of harmonics boosting, front steepening, and destruction of a long monochromatic wave (with the formation of a shock wave) moving over a shallow-water plane shelf. The well-known theoretical method of simple waves is generalized to include the dissipation due to friction against the bottom. The destruction conditions are found, and the growth of harmonics in a tidal wave M2 propagating on the Siberian shelf is calculated.
Show AbstractGlobular cluster M15: effects of gravitational focusing
Globular cluster M15: effects of gravitational focusing
M.Yu. Maslakov
The central part of the stellar globular cluster M15 has been investigated in search of the effects of gravitational focusing. The feasibility of this effect has been established by comparing the dispersion of the brightness of stars in the central part of the cluster, where this process more probable is, with the brightness of stars in a region distant from the center. The magnitudes of the dispersions have been estimated by the maximum likelihood method.
Show AbstractStability of orbits of small planets in the outer part of the asteroid ring
Stability of orbits of small planets in the outer part of the asteroid ring
I.A. Gerasimov, N.V. Rakitina
In the framework of the limited planar circular three-body problem it is shown that asteroids, which are unstable according to Hill, nevertheless can have stable orbits in the case of the first-order resonances. The limits and periods of changes in the eccentricities have been calculated for asteroids of the Hilda group.
Show AbstractOn the correlation between the width of the phase transition region near the Curie point and the variance of distribution of hyperfine magnetic fields in alloys $Fe_{75}(Cr_xCo_{1-x})_{25}$
On the correlation between the width of the phase transition region near the Curie point and the variance of distribution of hyperfine magnetic fields in alloys $Fe_{75}(Cr_xCo_{1-x})_{25}$
P.N. Stetsenko, M.A. Mostafa (Egypt), S.D. Antipov, L.A. Kondrashova
A correlation between the width of the phase transition region near the Curie points and the variance of the distribution function for hyperfine magnetic fields has been established on the basis of studies of the temperature dependence of magnetization and the distribution function of hyperfine magnetic fields on $^{57}Fe$ nuclei in rapidly quenched $Fe_{75}(Cr_xCo_{1-x})_{25}$ alloys.
Show AbstractOptical properties of magnetic semiconductors $xCuCr_2S_4- (1-x)Cu_{0,5}Ga_{0,5}Cr_2S_4$
Optical properties of magnetic semiconductors $xCuCr_2S_4- (1-x)Cu_{0,5}Ga_{0,5}Cr_2S_4$
L.I. Koroleva, Sh.Z. Sadykova, V.Yu. Pavlov
The spectra of diffuse reflectivity of magnetic semiconductors $xCuCr_2S_4-(1-x)Cu_{0,5}Ga_{0,5}Cr_2S_4$ ($x$ = 0; 0.05; 0.1) have been investigated within the temperature range from 115 to 353 K. Based on the spectra obtained, a diagram of the energy band structure is proposed for these semiconductors, which is close to the band structure of a similar compound, $xCuCr_2S_4-(1-x)Cu_{0,5}In_{0,5}Cr_2S_4$.
Show AbstractLow-temperature relaxation in disordered organic semiconductors
Low-temperature relaxation in disordered organic semiconductors
I.P. Zvyagin, A.V. Plyukhin
The electron hopping relaxation in disordered organic semiconductors was analyzed within the framework of the diagonal-disorder model. The time variation of the electron concentration at the percolation level was found for different relaxation stages, the conditions for passing from dispersive to normal (Gaussian) transport were studied, and the dependence of the dispersion parameter on the temperature and the disorder degree was determined.
Show AbstractRenormalizable model of massive gauge fields in a five-dimensional space
Renormalizable model of massive gauge fields in a five-dimensional space
D.A. Slavnov
A new scheme is proposed for the description of massive gauge fields in which masses are induced by additional components of vector fields. By way of example, the scheme was applied to the gauge sector of the model of weak electric interactions.
Show AbstractModification of gamma radiation spectrum in the proton field of a power spectrum
Modification of gamma radiation spectrum in the proton field of a power spectrum
I.P. Ivanenko, V.V. Sizov
This paper is devoted to studies of changes in the shape of a spectrum of highenergy gamma radiation as it travels through the photon field of a power spectrum (X-radiation in the active zone of compact gamma radiation sources). A relationship is established between the characteristics of the field and the gamma radiation spectrum.
Show AbstractMechanisms of mutual synchronization of two resonance-coupled oscillators
Mechanisms of mutual synchronization of two resonance-coupled oscillators
Yu.I. Kuznetsov, I.I. Minakova, M.I. Shchedrina
Mechanisms of mutual synchronization of coupled oscillators are analyzed for different types and magnitudes of the coupling. It is shown that mechanisms of transition from multifrequency to single-frequency operation of separate oscillators depend on the $Q$-factor and detuning of the coupling circuit.
Show AbstractNonlinear saturation of the wave-magnetized electron beam interaction in a dielectric waveguide (optimization of Compton process in the Cerenkov emitter)
Nonlinear saturation of the wave-magnetized electron beam interaction in a dielectric waveguide (optimization of Compton process in the Cerenkov emitter)
V.K. Grishin, I.F. Lenskii
This paper considers nonlinear interaction of a magnetized electron beam with a radiated wave in a dielectric waveguide at the stage of process saturation due to the capture of particles by the wave. The Compton mechanism of radiation excitation in devices of the Cerenkov emitter type is optimized on the basis of conservation laws and analysis of nonlinear solutions of the Vlasov kinetic equation. Beam density distributions corresponding to the maximum efficiency are presented.
Show AbstractАнализ процесса рекомбинации атомов водорода на поверхности твердых тел
Анализ процесса рекомбинации атомов водорода на поверхности твердых тел
Analysis of recombination of hydrogen atoms on solid surfaces
A method of theoretical description of recombination of hydrogen atoms on solid surfaces is proposed which is based on scattering theory for several quantum particles.
Show AbstractElectron structure and optical properties of BaO
Electron structure and optical properties of BaO
A.A. Grigorenko, V.S. Stepanyuk, A.A. Katsnel'son, O.V. Farberovich, V.V. Mikhailin
A completely self-consistent band structure calculation was performed for BaO. A theoretical energy dependence of the imaginary part of the permittivity function was obtained for the first time. The results obtained show satisfactory agreement with experimental data.
Show Abstract