Bianchi-II cosmological models with rotation in general relativity theory

We obtain a broad class of new exact solutions in Bianchi-II cosmologies with rotation and expansion. We show that within the framework of general relativity theory, we can construct realistic cosmological models in good agreement with current observational data.N. É. Bauman State Technical University, Moscow. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 10, pp. 54–63, October, 1994.     

Stäckel electrovacuum spaces that admit full separation of variables in a diagonalized Dirac equation. Type (2.1)

We list all electrovacuum Stäckel spaces of the type (2.1) that admit diagonalization and full separation of variables in the Dirac equation.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 2, pp. 116–120, February, 1992.     

Relativistic analysis of magnetoelectric crystals: Extracting a new 4-dimensional P odd and T odd pseudoscalar from Cr2O3 data

Earlier, the linear magnetoelectric effect of chromium sesquioxide Cr₂O₃ has been determined experimentally as a function of temperature. One measures the electric field-induced magnetization on Cr₂O₃ crystals or the magnetic field-induced polarization. From the magnetoelectric moduli of Cr₂O₃ we extract a 4-dimensional relativistic invariant pseudoscalar . It is temperature dependent and of the order of ∼¹⁰⁻⁴Y₀, with Y₀ as vacuum admittance. We show that the new pseudoscalar is odd under parity transformation and odd under time inversion. Moreover, is for Cr₂O₃ what Tellegen's gyrator is for two port theory, the axion field for axion electrodynamics, and the PEMC (perfect electromagnetic conductor) for electrical engineering.     

Probing non-Riemannian spacetime geometry

The equations of motion for matter in non-Riemannian spacetimes are derived via a multipole method. It is found that only test bodies with microstructure couple to the non-Riemannian spacetime geometry. Consequently it is impossible to detect spacetime torsion with the satellite experiment Gravity Probe B, contrary to some recent claims in the literature.     

Application of the Nuclear Reaction Analysis Online Technique to Study the Diffusion of Deuterium in Metals

Nuclear reaction analysis online technique has been applied to study the diffusion of deuterium in metals. Investigations ensuring the application of the new method have been performed. These investigations include the development of a device for diffusion annealing of samples in the chamber of an accelerator and an algorithm for taking into account the effect of radiation defects on the diffusion coefficients. Test measurements of the diffusion coefficients of deuterium in nickel in the temperature range from 130 to–60°С have been performed. For negative temperatures, experimental data on the diffusion of a hydrogen isotope in a metal have been obtained for the first time by a direct method and it has been shown that the online nuclear reaction analysis provides reliable data.     

Optical Spectroscopy and the Structure of Polyfunctional Hydrocarbon Compounds and Oil Products

The optical and physicochemical properties associated with the change (oxidation, thermolysis and photolysis), during the operation, of the spatial and electronic structures of the polyfunctional hydrocarbon compounds, oils, oil products, and N-, O-, and S-containing heteroaromatic compounds and additives, which comprise a variety of fuel and lubricant compositions involved in the structural and phase rearrangements, as well as in the formation of colloidal and micelle aggregates altering the structure with respect to their hydrocarbon, chemical, and fractional compositions, are investigated. The spectroscopic-luminescent properties of the compounds and their ion-radical forms were studied using optical and spectroscopic methods and quantum-chemical calculations when the excitation energy in the full spectra of singlet and triplet (for the ion, quartet and doublet) electronic excited states was deactivated. Intramolecular mechanisms of the hyperfine electron–nucleus interaction between the active groups of quasi-oscillators in the structure of polyfunctional compounds in the paramagnetic states of hydrocarbons, which form the electronic structure of the triplet–triplet transitions induced by pumping in the optical absorption spectra, are studied. It is shown that the mechanism of multistep ionization, fragmentation, and appearance of radicals and the electronic-vibrational mechanism of an increase in the vibration temperature up to T = 6000–7000 K are developed during the action of the ultraviolet (UV) pumping pulse of a nanosecond duration until the light emission, which gives rise to thermolysis and recombination that create the conditions for the combustion and explosion when the excitation energy is localized on a limited number of groups of quasi-oscillators in the structure.     

Wormholes in a Brane Universe

In this work, wormholes are discussed for the case where the classical brane action contains a 4-curvature. Equations of motion are obtained for R = 0 and R 0. Numerical solutions of these equations are found for special boundary conditions.