A5074267178- Cosmology and Gravitation Theories
- Black Holes and Theoretical Physics
- Relativity and Gravitational Theory
- Noncommutative and Quantum Gravity Theories
- Quantum and Classical Electrodynamics
- Advanced Differential Geometry Research
- Geophysics and Gravity Measurements
- Pulsars and Gravitational Waves Research
- Geophysics and Sensor Technology
- Quantum Mechanics and Applications
- Magnetic properties of thin films
- Quantum Electrodynamics and Casimir Effect
- Atomic and Subatomic Physics Research
- Force Microscopy Techniques and Applications
- Mechanical and Optical Resonators
- Magneto-Optical Properties and Applications
- Dark Matter and Cosmic Phenomena
- Algebraic and Geometric Analysis
- Multiferroics and related materials
- Advanced Thermodynamics and Statistical Mechanics
- Quantum and electron transport phenomena
- Experimental and Theoretical Physics Studies
- Computational Physics and Python Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Characterization and Applications of Magnetic Nanoparticles
Nuclear Safety Institute
2015-2024
Russian Academy of Sciences
2015-2024
Western Digital (United States)
2015-2021
University of Bremen
2016-2020
SpaceTech (Germany)
2018
Jerusalem College of Technology
2017
Hebrew University of Jerusalem
2017
Hitachi Global Storage Technologies (United States)
2015
Association Vinçotte Nuclear
2015
Lomonosov Moscow State University
2001-2012
Bit Patterned Media (BPM) for magnetic recording provide a route to densities $>1 Tb/in^2$ and circumvents many of the challenges associated with conventional granular media technology. Instead bit on an ensemble random grains, BPM uses array lithographically defined isolated islands, each which stores one bit. Fabrication is viewed as greatest challenge its commercialization. In this article we describe fabrication method combines e-beam lithography, directed self-assembly block copolymers,...
The variational theory of an ideal spinning fluid is developed. This described by original Weyssenhoff-Raabe tensors spin and energy-momentum. Both neutral charged fluids are considered, the equations motion conservation laws for Weyssenhoff in Riemann-Cartan spacetime discussed. results applied to study cosmological models with rotation, shear expansion framework Einstein-Cartan gravity.
In the gauge theory of gravity based on Poincaré group (the semidirect product Lorentz and spacetime translations) mass (energy–momentum) spin are treated an equal footing as sources gravitational field. The corresponding manifold carries Riemann–Cartan geometric structure with nontrivial curvature torsion. We describe some aspects classical gravity. Namely, Lagrange–Noether formalism is presented in full generality, family quadratic (in torsion) models analyzed detail. discuss special case...
We discuss the quantum and classical dynamics of a particle with spin in gravitational field rotating source. A relativistic equation describing motion curved spacetimes is obtained. demonstrate that precession perfect agreement derived from Foldy-Wouthuysen approach for Dirac spacetime. show effect depends crucially on choice tetrad. The results obtained are compared to earlier computations different tetrad gauges.
We discuss the quantum dynamics of a Dirac fermion particle in Poincar\'e gauge gravitational field. The minimal as well Pauli-type nonminimal coupling with external fields is studied, bringing into consideration notions translational and Lorentz moments. anomalous gravitomagnetic gravitoelectric moments are ruled out on basis covariance arguments. derive general Foldy-Wouthuysen transformation for an arbitrary configuration field without assuming it weak. Making use Hamiltonian coupled to...
We investigate the motion of spinning test bodies in General Relativity. By means a multipolar approximation method for extended we derive equations and classify orbital pole-dipole equatorial plane Kerr geometry. An exact expression periastron shift body is given. Implications spin corrections are studied compared with results obtained by other schemes.
The gravitational effects in the relativistic quantum mechanics are investigated. exact Foldy-Wouthuysen transformation is constructed for Dirac particle coupled to static spacetime metric. As a direct application, we analyze nonrelativistic limit of theory. new term describing specific spin (gravitational moment) interaction effect recovered Hamiltonian. comparison true coupling with purely inertial case demonstrates that do not violate equivalence principle fermions.
The properties of the gravitational energy-momentum 3-form and superpotential 2-form are discussed in covariant teleparallel framework, where Weitzenb\"ock connection represents inertial effects related to choice frame. Because its odd asymptotic behavior, contribution often yields unphysical (divergent or trivial) results for total energy system. However, approach, is always finite nontrivial. plays a role regularizing tool which subtracts without distorting true contribution. As crucial...
Earlier, the magnetoelectric effect of chromium sesquioxide Cr_2O_3 has been determined experimentally as a function temperature. One measures electric field-induced magnetization on crystals or magnetic polarization. From moduli we extract 4-dimensional relativistic invariant pseudoscalar $\widetilde{\alpha}$. It is temperature dependent and order 10^{-4}/Z_0, with Z_0 vacuum impedance. We show that new odd under parity transformation time inversion. Moreover, $\widetilde{\alpha}$ for what...
We present a covariant derivation of the equations motion for test bodies wide class gravitational theories with nonminimal coupling, encompassing general interaction via complete set nine parity-even curvature invariants. The spinning in such are explicitly derived by means Synge's expansion technique. Our findings generalize previous results literature and allow direct comparison to relativistic pole-dipole bodies.
We study the quantum mechanics of a Dirac fermion on curved spacetime manifold. The metric is completely arbitrary, allowing for discussion all possible inertial and gravitational field configurations. In this framework, we find Hermitian Hamiltonian an arbitrary classical external (including electromagnetic ones). order to discuss physical content quantum-mechanical model, further apply Foldy-Wouthuysen transformation, derive equations motion spin position operators. analyze semiclassical...
We discuss the dynamics of Dirac fermions in general strong gravitational and electromagnetic fields. derive Hermitian Hamiltonian transform it to Foldy-Wouthuysen representation for spatially isotropic metric. The quantum operator equations motion are obtained semiclassical limit is analyzed. comparison mechanical classical shows their complete agreement. helicity fields discussed. Squaring covariant equation explicitly a similarity interactions with charged spinning particle.
We use the Lagrange-Noether methods to derive conservation laws for models in which matter interacts nonminimally with gravitational field. The nonminimal coupling function can depend arbitrarily on field strength. obtained result generalizes earlier findings. generalized provide basis derivation of equations motion coupled test bodies.
We study general metric-affine theories of gravity in which the metric and connection are two independent fundamental variables. In this framework, we use Lagrange--Noether methods to derive identities conservation laws that correspond invariance action under coordinate transformations. The results obtained applied generalized models with nonminimal coupling matter gravity, a function depends arbitrarily on covariant gravitational field
We develop the general theory of spinning particles with electric and magnetic dipole moments moving in arbitrary electromagnetic, inertial, gravitational fields. Both quantum-mechanical classical dynamics is investigated. start from covariant Dirac equation extended to a spin-$\frac{1}{2}$ fermion anomalous then perform relativistic Foldy-Wouthuysen transformation. This transformation allows us obtain equations motion for physical operators Schr\"odinger form establish limit quantum...
We review the basics and current status of Poincaré gauge theory gravity. The general dynamical scheme gravity (PG) is formulated, its physical consequences are outlined. In particular, we discuss exact solutions with without torsion, highlight cosmological aspects, consider probing spacetime geometry.
The quintet of Dirac $4\ifmmode\times\else\texttimes\fi{}4$ matrices suggests that the fundamental dimension internal (spin) space is $n=5$, instead conventional $n=4$. Then tetrads (vierbein), gravity described in terms 5-bein (f\"unfbein or five legs). We discuss properties spacetime geometry induced from this 5-leg spinor theory, where spin connection contains $10\ifmmode\times\else\texttimes\fi{}4=40$ elements 24 tetrad formulation general relativity theory.