A5074695336- Neutrino Physics Research
- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Quantum, superfluid, helium dynamics
- Pulsars and Gravitational Waves Research
- Cosmology and Gravitation Theories
- Atomic and Subatomic Physics Research
- Nuclear Physics and Applications
- Astrophysical Phenomena and Observations
- Particle Detector Development and Performance
- Particle Accelerators and Free-Electron Lasers
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Computational Physics and Python Applications
- Astronomical Observations and Instrumentation
- Quantum and Classical Electrodynamics
- Solar and Space Plasma Dynamics
- Quantum chaos and dynamical systems
- Astro and Planetary Science
- Laser-Plasma Interactions and Diagnostics
- Advanced Chemical Physics Studies
- Astronomy and Astrophysical Research
Yaroslavl State University
2012-2024
Petrozavodsk State University
1970-2022
A.P. Krylov All-Russian Oil and Gas Research Institute (Russia)
2021
Peoples' Friendship University of Russia
2020
Institute for Information Transmission Problems
2020
Lukoil (Russia)
2019
Lomonosov Moscow State University
2004-2017
Moscow Engineering Physics Institute
2016
Bauman Moscow State Technical University
2016
Space Research Institute
1990-2011
We calculate the neutrino self-energy operator $\ensuremath{\Sigma}(p)$ in presence of a magnetic field $B$. In particular, we consider weak-field limit $eB\ensuremath{\ll}{m}_{\ensuremath{\ell}}^{2}$, where ${m}_{\ensuremath{\ell}}$ is charged-lepton mass corresponding to flavor ${\ensuremath{\nu}}_{\ensuremath{\ell}}$, and ``moderate field'' ${m}_{\ensuremath{\ell}}^{2}\ensuremath{\ll}eB\ensuremath{\ll}{m}_{W}^{2}$. Our results differ substantially from previous literature. For moderate...
The low-energy manifestations of a minimal extension the electroweak standard model based on quark–lepton symmetry SU(4) V ⊗SU(2) L ⊗G R Pati–Salam-type are analyzed. Given this third type mixing in interactions leptoquarks with quarks and leptons is shown to be required. An additional arbitrariness parameters could allow, principle, decrease noticeably lower bound vector leptoquark mass originated from rare processes, strongly suppressed model.
Six Einstein observations of five gamma-ray burst sources are presented and discussed. With one possible exception, no point source was detected in any the observations. The data interpreted framework neutron star models for gamma bursters. Upper limits derived surface temperatures stars assumed to be responsible bursts. It is shown that lack soft X-ray emission may impose stringent constraints on accretion rates onto stars.
The exact propagator for an electron in a constant uniform magnetic field as the sum over Landau levels is obtained by direct derivation standard methods of quantum theory from solutions Dirac equation field. result can be useful further development calculation technique processes external active medium, particularly conditions moderately large strengths when it insufficient to take into account only ground level contribution.
The neutrino helicity-flip process under the conditions of supernova core is reinvestigated. Instead uniform ball model for SN used in previous analyses, realistic models radial distributions and time evolution physical parameters are considered. A new upper bound on Dirac magnetic moment obtained from limit luminosity nu_R emission.
A thermodynamic assessment of the urea–biuret–water ternary system and its binary subsystems has been made. The Margules model applied for description excess Gibbs energies solutions, properties solutions have assessed by using Muggiani method. Thermodynamic (NH2CO)2NH·(NH2)2CO (I) (NH2CO)2NH·0.7H2O (II) estimated from condition equilibrium between solution stochiometric phases. liquidus surface isothermal sections phase diagram at temperature interval T = (268 to 373) K calculated....
The electron mass operator in a strong magnetic field is calculated by summation of the leading log contributions all orders perturbation theory. An influence on virtual photon polarization taken into account. contribution higher Landau levels electrons, along with ground level, shown to be essential approximation.
The neutrino chirality flip process under the conditions of supernova core is investigated in detail with plasma polarization effects photon propagator taken into account, a more consistent way than earlier publications. It shown part that contribution proton fraction dominates. A new upper bound on Dirac magnetic moment obtained from limit luminosity for νR emission: μν<(0.7–1.5) × 10−12 μB. best SN1987A improved by factor 2.
The fermion spin–flip conversion f L → R + γ is considered, caused by the difference of additional energies electroweak origin, acquired left- and right-handed fermions (neutrino, electron) in medium. An accurate analysis photon dispersion medium performed. It shown that threshold arises process, (plasmon) effective mass. This leaves no room for so-called "spin light neutrino" electron" real astrophysical situations.
As we are going to show, some self-interacting dark matter models may provide an intriguing solution the "cosmic antiparticle excess vs. isotropic diffuse gamma-ray background" problem (an overproduction of gamma rays, arising in any reasonable decaying or annihilating model explaining high-energy charged cosmic antiparticles anomalous abundance).
We are going to show that any conventional decaying dark matter model, providing an explanation of cosmic antiparticle excess observed by PAMELA and AMS-02, inevitably faces the contradiction with isotropic diffuse gamma-ray background, measured FERMI/LAT.
The electron mass operator in a strong magnetic field is calculated. contribution of higher Landau levels virtual electrons, along with the ground level, shown to be essential leading log approximation. effect dynamical generation by investigated. In model N charged fermions, it that some critical number N(cr) exists for any value electromagnetic coupling constant alpha, such fermion generated doublet splitting N<N(cr), and does not arise at all N>N(cr), thus leaving chiral symmetry unbroken.