A5012757930- Quantum and Classical Electrodynamics
- Atomic and Subatomic Physics Research
- Particle Accelerators and Free-Electron Lasers
- Crystallography and Radiation Phenomena
- Quantum Mechanics and Applications
- Particle physics theoretical and experimental studies
- Noncommutative and Quantum Gravity Theories
- Particle accelerators and beam dynamics
- Algebraic and Geometric Analysis
- Relativity and Gravitational Theory
- Quantum Mechanics and Non-Hermitian Physics
- Cosmology and Gravitation Theories
- Cold Atom Physics and Bose-Einstein Condensates
- Orbital Angular Momentum in Optics
- Dark Matter and Cosmic Phenomena
- Advanced NMR Techniques and Applications
- Atomic and Molecular Physics
- Quantum, superfluid, helium dynamics
- Quantum Chromodynamics and Particle Interactions
- Nuclear physics research studies
- Black Holes and Theoretical Physics
- Pulsars and Gravitational Waves Research
- Muon and positron interactions and applications
- Geophysics and Sensor Technology
- Quantum Electrodynamics and Casimir Effect
Joint Institute for Nuclear Research
2016-2025
Belarusian State University
2015-2024
Institute of Modern Physics
2017-2024
Chinese Academy of Sciences
2017-2024
Centre de Physique Théorique
2024
Sun Yat-sen University
2021
Dubna State University
2020
Landau Institute for Theoretical Physics
2019
Moscow Institute of Physics and Technology
2019
Max Planck Institute for Nuclear Physics
2019
A new highly sensitive method of looking for electric dipole moments charged particles in storage rings is described. The major systematic errors inherent the are addressed and ways to minimize them suggested. It seems possible measure muon EDM levels that test speculative theories beyond standard model.
A new experiment is described to detect a permanent electric dipole moment of the proton with sensitivity $10^{-29}e\cdot$cm by using polarized "magic" momentum $0.7$~GeV/c protons in an all-electric storage ring. Systematic errors relevant are discussed and techniques address them presented. The measurement sensitive physics beyond Standard Model at scale 3000~TeV.
The behavior of spin-1/2 particle in a weak static gravitational field is considered. Dirac Hamiltonian diagonalized by the Foldy-Wouthuysen transformation providing also simple form for momentum and spin polarization operators. operator equations motion are derived first time. Their semiclassical limit analyzed. dipole spin-gravity coupling previously found (another) does not lead to any observable effects. general agreement between quantum classical analysis established, contrary several...
A general method of the Foldy-Wouthyusen (FW) transformation for relativistic particles arbitrary spin in strong external fields has been developed. The use found operator is not restricted by any definite commutation relations between even and odd operators. final FW Hamiltonian can be expanded into a power series Planck constant which characterizes order magnitude quantum corrections. Exact expressions low-order terms derived. Finding these allows one to perform simple transition...
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.
General classical equation of spin motion is explicitly derived for a particle with magnetic and electric dipole moments in electromagnetic fields. Equation describing the relatively momentum direction storage rings also obtained.
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...
A new method to determine the spin tune is described and tested. In an ideal planar magnetic ring, tune-defined as number of precessions per turn-is given by ν(s)=γG (γ Lorentz factor, G gyromagnetic anomaly). At 970 MeV/c, deuteron spins coherently precess at a frequency ≈120 kHz in Cooler Synchrotron COSY. The deduced from up-down asymmetry deuteron-carbon scattering. time interval 2.6 s, was determined with precision order 10^{-8}, 1×10^{-10} for continuous 100 s accelerator cycle. This...
We observe a deuteron beam polarization lifetime near 1000 s in the horizontal plane of magnetic storage ring (COSY). This long spin coherence time is maintained through combination bunching, electron cooling, sextupole field corrections, and suppression collective effects current limits. record required for search an intrinsic electric dipole moment on at statistical sensitivity level approaching 10^{-29} e cm.
We study the possibility of experimentally testing manifestations equivalence principle in spin-gravity interactions. reconsider earlier experimental data and get first bound on anomalous gravitomagnetic moment. The spin coupling to Earth's rotation may also be explored at extensions neutron electric-dipole-moment $g\ensuremath{-}2$ experiments. terrestrial gravity produces a considerable effect which discovered planned deuteron experiment. should taken into account optical experiments...
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 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...
The problem of the position and spin in relativistic quantum mechanics is analyzed detail. It definitively shown that operators Foldy-Wouthuysen representation (but not Dirac one) are quantum-mechanical counterparts classical variables. probabilistic interpretation valid only for wave functions. discussed. spin-orbit interaction does exist a free particle if conventional orbital angular momentum rest-frame used. Alternative definitions based on noncommutative geometry, do satisfy standard...
This paper presents the successful application of a phase-lock feedback system to maintain resonance condition radio frequency (rf) spin rotator (specifically, an rf Wien filter) with respect 120 kHz precession in Cooler Synchrotron (COSY) storage ring. Real-time monitoring and filter signal allows relative phase between two be stabilized at arbitrary setpoint. The compensates for deviations by adjusting and/or as needed. With this method, variation demand standard deviation...
A general method of the Foldy-Wouthuysen transformation is developed. This applicable to relativistic particles with any spin in arbitrarily strong external fields. It can be used when de Broglie wavelength much smaller than characteristic distance. Contrary previously developed methods, present satisfies condition exact and well substantiated. The derived Hamiltonian expanded powers Planck constant. In this expansion, terms proportional zero first are determined exactly accordance above...
This Letter reports the successful use of feedback from a spin polarization measurement to revolution frequency $0.97\text{ }\text{ }\mathrm{GeV}/c$ bunched and polarized deuteron beam in Cooler Synchrotron (COSY) storage ring order control both precession rate ($\ensuremath{\approx}121\text{ }\mathrm{kHz}$) phase horizontal component. Real time synchronization with radio (rf) solenoid made possible rotation out plane, yielding demonstration method manipulate polarization. In particular,...
A concise demonstrative summary of the Symmetric Hybrid ring design for storage proton electric dipole moment experiment is presented. Critical issues such as lattice design, background electrical fields,geometrical phase, general relativity, spin coherence time and polarimeter systematics are Overall, we find that with currently proposed iteration, systematic error sources reduced by orders magnitude alignment requirements within available technology.
A method of Foldy-Wouthuysen transformation for relativistic spin-1/2 particles in external fields is proposed. It permits determination the Hamilton operator representation with any accuracy. Interactions between a particle having an anomalous magnetic moment and nonstationary electromagnetic electroweak are investigated.
The stable spin direction of polarized particles in a storage ring was determined first experimentally, through an accurate measurement the tune and its response to longitudinal magnetic fields.