Covariant mechanics and the forms of relativistic dynamics
Covariant mechanics and the forms of relativistic dynamics
N.P. Klepikov, A.N. Shatnii
It is shown that the Dirac forms of relativistic dynamics can be obtained from the covariant formulation of relativistic mechanics. The formulation of the problem in terms of various forms of relativistic dynamics is made more rigorous, and we give an interpretation of the physical equivalence of these forms.
Show AbstractNonlinear polarizability of impurity centers in semiconductors
Nonlinear polarizability of impurity centers in semiconductors
Yu.P. Drozhzhov
It is shown that the presence of an impurity in semiconductor can lead to a resonant structure of the coefficient of nonlinear polarizability.
Show AbstractThe space of states of the gravitational field in the Hamiltonian approach to general theory of relativity
The space of states of the gravitational field in the Hamiltonian approach to general theory of relativity
A.E. Pukhov
For the general theory of relativity with asymptotically flat metric, we construct a space of states Г which satisfy the following requirements: a) solutions of the constraint equations exist in Г; b) Г is invariant with respect to transformations of the Poincare group; c) the symplectic form in Г is finite. Using the symplectic form, we construct the generators of the equations of motion (Poincare transformations).
Show AbstractThe contribution of weak interaction to the hyperfine splitting of levels of hydrogen-like atoms
The contribution of weak interaction to the hyperfine splitting of levels of hydrogen-like atoms
V.V. Starshenko, R.N. Faustov
Using a standard model of the weak electric interactions, we calculate the contribution of weak neutral currents to the shift of energy levels of hydrogen-like atoms. The Logunov-Takhvelidze quasipotential method is used to obtain the weak-interaction potential between particles in the nonrelativistic approximation. We calculate the contribution of the P-even part of this potential to the hyperfine splitting of levels of muonium and muonic hydrogen.
Show AbstractClassical and quantum Kubo-Martin-Schwinger conditions for one-dimensional dynamical systems
Classical and quantum Kubo-Martin-Schwinger conditions for one-dimensional dynamical systems
A.R. Maikov
We show the existence of quantization of a one-dimensional Hamiltonian system in which the classical and quantum Kubo-Martin-Schwinger states coincide on the classical observable and on its quantum analog.
Show AbstractTemperature dependence of the electronic spectra of complex organic molecules
Temperature dependence of the electronic spectra of complex organic molecules
L.V. Levshin, B.D. Ryzhikov, S.I. Stal'makhovich
We study the temperature dependence of the absorption spectra of rhodamine dyes in polar solutions. It is shown that when volume expansion of the solvent is taken into account, the absorptivity of molecules of rhodamine dyes remains constant in a wide range of temperatures. This is in a good agreement with the phonon mechanism of broadening of the absorption spectra.
Show AbstractAnomalous kinetics of cathodoluminescence in GaN:Zn
Anomalous kinetics of cathodoluminescence in GaN:Zn
G.V. Saparin$^1$, S.K. Obyden$^1$, I.F. Chetverikova$^2$, M.V. Chukichev$^1$, S.I. Popov$^1$
Electron-beam irradiation of the i region of an i-n structure based on zinc-doped gallium nitride is observed to increase the intensity of the cathodoluminescence band with maximum at $\hbar \omega=2,87$ eV. The emission intensity increases by 1.5-2 orders of magnitude in comparison with the intensity at the initial period of the irradiation. Irradiation beyond the broad maximum caused the intensity to decrease. The experiments were carried out with electron-beam energy 20 keV, current density up to 200 A/cm$^2$, and sample temperature 300°K.
Show AbstractGeneralized Klein-Gordon equation and the Mach principle
Generalized Klein-Gordon equation and the Mach principle
G.Yu. Bogoslovskii
It is shown that estimates of anisotropy of the inertial mass $\Delta m/m<10^{-22}$ and $\Delta m/m<5\cdot 10^{-23}$, which were obtained in experiments testing the Mach prinriple, are incorrect. A generalized Klein-Gordon equation is developed using a relativistic theory of locally anisotropic space-time which is consistent with the Mach principle. This equation makes it possible to take into account correctly the effect of anisotropy on the nuclear potential.
Show AbstractMean-velocity approximation and the theory of broadening of spectral lines in gases
Mean-velocity approximation and the theory of broadening of spectral lines in gases
S.Yu. Nikitin
We develop a method for estimating the width of spectral lines, which makes it possible to obtain the result in an analytical form at any gas pressure. The method is based on the fact that the Doppler broadening of spectral lines in gases is determ1ned by the mean velocity with which the molecules move to distances of the order of a wavelength of the light wave, rather than by the instantaneous velocity of molecules. The calculated line-width agrees well with the experimental data for hydrogen in a wide range of pressures, including the Dicke narrowing region.
Show AbstractAnisotropy of the anomalous Hall effect in nickel-palladium monocrystals
Anisotropy of the anomalous Hall effect in nickel-palladium monocrystals
R.P. Vasil'eva, G.M. Myalikgulyev, S.I. Stadnik
We study experimentally the anomalous Hall effect in a system of monocrystalline Ni-Pd alloys at room temperature. The character of the observed anisotropy of the anomalous Hall effect makes it possible to draw the conclusion that the magnitude of the effect and its anisotropy are affected considerably by the spin-orbit splitting of degenerate levels.
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