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Results for "Árni V. Johannesson"

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Approximate Bayesian inference for spatial flood frequency analysisJul 10 2019Extreme floods cause casualties, widespread property damage, and damage to vital civil infrastructure. Predictions of extreme floods within gauged and ungauged catchments is crucial to mitigate these disasters. A Bayesian framework is proposed for predicting ... More
High-Energy Gamma Rays from the Milky Way: Three-Dimensional Spatial Models for the Cosmic-Ray and Radiation Field Densities in the Interstellar MediumAug 02 2017High-energy gamma rays of interstellar origin are produced by the interaction of cosmic-ray (CR) particles with the diffuse gas and radiation fields in the Galaxy. The main features of this emission are well understood and are reproduced by existing CR ... More
Galactic PeVatrons and helping to find them: Effects of Galactic absorption on the observed spectra of very high energy $γ$-ray sourcesAug 23 2018Identification of the cosmic-ray (CR) `PeVatrons', which are sources capable of accelerating particles to $\sim10^{15}$ eV energies and higher, may lead to resolving the long-standing question of the origin of the spectral feature in the all-particle ... More
Fluctuation Effects in Steric Reaction-Diffusion SystemsJan 15 1999We propose a simple model for reaction-diffusion systems with orientational constraints on the reactivity of particles, and map it onto a field theory with upper critical dimension d_c=2. To two-loop level the long-time particle density N(t) is given ... More
The Three-Dimensional Spatial Distribution of Interstellar Gas in the Milky Way: Implications for Cosmic Rays and High-Energy Gamma-Ray EmissionsFeb 23 2018Direct measurements of cosmic ray (CR) species combined with observations of their associated gamma-ray emissions can be used to constrain models of CR propagation, trace the structure of the Galaxy, and search for signatures of new physics. The spatial ... More
Cosmic-Ray Propagation in Light of Recent Observation of GemingaMar 13 2019The High Altitude Water Cherenkov (HAWC) telescope recently observed extended emission around the Geminga and PSR~B0656+14 pulsar wind nebulae (PWNe). These observations have been used to estimate cosmic-ray (CR) diffusion coefficients near the PWNe that ... More
GALPROP cosmic-ray propagation code: recent results and updatesDec 28 2017Information on cosmic-ray (CR) composition comes from direct CR measurements while their distribution in the Galaxy is evaluated from observations of their associated diffuse emission in the range from radio to gamma rays. Even though the main interaction ... More
Searching for Voltage Graph-Based LDPC Tailbiting Codes with Large GirthAug 03 2011The relation between parity-check matrices of quasi-cyclic (QC) low-density parity-check (LDPC) codes and biadjacency matrices of bipartite graphs supports searching for powerful LDPC block codes. Using the principle of tailbiting, compact representations ... More
Woven Graph Codes: Asymptotic Performances and ExamplesApr 07 2008Apr 22 2008Constructions of woven graph codes based on constituent block and convolutional codes are studied. It is shown that within the random ensemble of such codes based on $s$-partite, $s$-uniform hypergraphs, where $s$ depends only on the code rate, there ... More
Cosmic-ray electrons, synchrotron and magnetic fields in the GalaxyJul 03 2009The cosmic-ray propagation code GALPROP has recently been enhanced in the areas of Galactic magnetic field and synchrotron radiation. A full 3D treatment is now implemented. We describe these enhancements and show applications to the interpretation of ... More
Bubble Growth in Superfluid 3-He: The Dynamics of the Curved A-B InterfaceJun 30 1993We study the hydrodynamics of the A-B interface with finite curvature. The interface tension is shown to enhance both the transition velocity and the amplitudes of second sound. In addition, the magnetic signals emitted by the growing bubble are calculated, ... More
Reduced fidelity in topological quantum phase transitionsFeb 23 2009Jun 11 2009We study the reduced fidelity between local states of lattice systems exhibiting topological order. By exploiting mappings to spin models with classical order, we are able to analytically extract the scaling behavior of the reduced fidelity at the corresponding ... More
Single-Site Entanglement of Fermions at a Quantum Phase TransitionFeb 03 2006May 19 2006We show that the single-site entanglement of a generic spin-1/2 fermionic lattice system can be used as a reliable marker of a finite-order quantum phase transition, given certain provisos. We discuss the information contained in the single-site entanglement ... More
Measuring Luttinger Liquid Correlations from Charge Fluctuations in a Nanoscale StructureJun 24 2003Dec 17 2003We suggest an experiment to study Luttinger liquid behavior in a one-dimensional nanostructure, avoiding the usual complications associated with transport measurements. The proposed setup consists of a quantum box, biased by a gate voltage, and side-coupled ... More
Loschmidt Echo Revivals: Critical and NoncriticalDec 21 2016Jan 05 2017A quantum phase transition is generally thought to imprint distinctive characteristics on the nonequilibrium dynamics of a closed quantum system. Specifically, the Loschmidt echo after a sudden quench to a quantum critical point $-$ measuring the time ... More
Boundary Green's Function for Spin-Incoherent Interacting Electrons in One DimensionMay 02 2006Oct 23 2007The spin-incoherent regime of one-dimensional electrons has recently been explored using the Bethe ansatz and a bosonized path integral approach, revealing that the spin incoherence dramatically influences the correlations of charge excitations. We here ... More
Multichannel Kondo Effect in an Interacting Electron System: Exact Results for the Low-Temperature ThermodynamicsOct 15 1997We study the low-temperature thermodynamics of a spin-S magnetic impurity coupled to m degenerate bands of interacting electrons in one dimension. By exploiting boundary conformal field theory techniques, we derive exact results for the possible impurity ... More
Global cosmic-ray related luminosity and energy budget of the Milky WayAug 25 2010We use the GALPROP code for cosmic-ray (CR) propagation to calculate the broad-band luminosity spectrum of the Milky Way related to CR propagation and interactions in the interstellar medium. This includes gamma-ray emission from the production and subsequent ... More
Interacting Electrons and Localized Spins: Exact Results from Conformal Field TheoryJun 22 1995We give a brief review of the Kondo effect in a one-dimensional interacting electron system, and present exact results for the impurity thermodynamic response based on conformal field theory.
Transport signatures of symmetry protection in one-dimensional topological insulatorsFeb 04 2019Apr 04 2019Topological insulators are identified as systems where a gapped bulk supports in-gap edge states, protected against symmetry-preserving local perturbations. In one dimension the robustness of the edge states shows up as a pinning of their energy levels ... More
Robustness of symmetry-protected topological states against time-periodic perturbationsApr 03 2017Aug 11 2017The existence of gapless boundary states is a key attribute of any topological insulator. Topological band theory predicts that these states are robust against static perturbations that preserve the relevant symmetries. In this article, using Floquet ... More
One-Dimensional Electron Liquid in an Antiferromagnetic Environment: Spin Gap from Magnetic CorrelationsJun 01 1999We study a one-dimensional electron liquid coupled by a weak spin-exchange interaction to an antiferromagnetic spin-S ladder with n legs. A perturbative renormalization group analysis in the semiclassical limit reveals the opening of a spin gap, driven ... More
Magnetic Impurity in a Luttinger Liquid: A Conformal Field Theory ApproachJun 22 1995We study the low-temperature properties of a spin-\onehalf\ magnetic impurity coupled to a one-dimensional interacting electron system. Using the newly developed formalism by Affleck and Ludwig, with a scale invariant boundary condition replacing the ... More
Decoherence from spin environments: Loschmidt echo and quasiparticle excitationsSep 27 2017Dec 20 2017We revisit the problem of decoherence of a qubit centrally coupled to an interacting spin environment, here modeled by a quantum compass chain or an extended XY model in a staggered magnetic field. These two models both support distinct spin liquid phases, ... More
Entanglement Scaling in the One-Dimensional Hubbard Model at CriticalityJun 22 2005Mar 02 2006We derive exact expressions for the local entanglement entropy E in the ground state of the one-dimensional Hubbard model at a quantum phase transition driven by a change in magnetic field h or chemical potential u. The leading divergences of dE/dh and ... More
Kondo Effect in a Luttinger Liquid: Exact Results from Conformal Field TheoryMay 23 1995We report on exact results for the low-temperature thermodynamics of a spin-$\frac{1}{2}$ magnetic impurity coupled to a one-dimensional interacting electron system. By using boundary conformal field theory, we show that there are only two types of critical ... More
Constraints on cosmic-ray propagation models from a global Bayesian analysisOct 30 2010Jan 06 2011Research in many areas of modern physics such as, e.g., indirect searches for dark matter and particle acceleration in SNR shocks, rely heavily on studies of cosmic rays (CRs) and associated diffuse emissions (radio, microwave, X-rays, gamma rays). While ... More
Pareto-optimal alloysOct 29 2003Large databases that can be used in the search for new materials with specific properties remain an elusive goal in materials science. The search problem is complicated by the fact that the optimal material for a given application is usually a compromise ... More
Multicriticality and entanglement in the one-dimensional quantum compass modelMar 10 2009Jun 29 2009We study the one-dimensional (1D) quantum compass model with two independent parameters by means of an exact mapping to the quantum Ising model. This allows us to uncover hidden features of the quantum phase transition in the ordinary one-parameter quantum ... More
Enhanced Two-Channel Kondo Physics in a Quantum Box DeviceFeb 08 2006Sep 02 2007We propose a design for a one-dimensional quantum box device where the charge fluctuations are described by an anisotropic two-channel Kondo model. The device consists of a quantum box in the Coulomb blockade regime, weakly coupled to a quantum wire by ... More
Two-Species Reaction-Diffusion System with Equal Diffusion Constants: Anomalous Density Decay at Large TimesOct 15 1999Jun 09 2000We study a two-species reaction-diffusion model where A+A->0, A+B->0 and B+B->0, with annihilation rates lambda0, delta0 > lambda0 and lambda0, respectively. The initial particle configuration is taken to be randomly mixed with mean densities nA(0) > ... More
Impurity entanglement entropy in Kondo systems from conformal field theoryFeb 12 2011Jul 29 2011The entanglement entropy in Kondo impurity systems is studied analytically using conformal field theory. From the impurity contribution to the scaling corrections of the entanglement entropy we extract information about the screening cloud profile for ... More
Corrections to scaling in entanglement entropy from boundary perturbationsNov 01 2010Feb 01 2011We investigate the corrections to scaling of the Renyi entropies of a region of size l at the end of a semi-infinite one-dimensional system described by a conformal field theory when the corrections come from irrelevant boundary operators. The corrections ... More
Tunneling between edge states in a quantum spin Hall systemNov 19 2008Mar 10 2009We analyze a quantum spin Hall (QSH) device with a point contact connecting two of its edges. The contact supports a net spin tunneling current that can be probed experimentally via a two-terminal resistance measurement. We find that the low-bias tunneling ... More
A generalization of the quantum Rabi model: exact solution and spectral structureJun 08 2017Sep 11 2017We consider a generalization of the quantum Rabi model where the two-level system and the single-mode cavity oscillator are coupled by an additional Stark-like term. By adapting a method recently introduced by Braak [Phys. Rev. Lett. {\bf 107}, 100401 ... More
Hidden Kondo Effect in a Correlated Electron ChainSep 04 1998We develop a general Bethe Ansatz formalism for diagonalizing an integrable model of a magnetic impurity of arbitrary spin coupled ferro- or antiferromagnetically to a chain of interacting electrons. The method is applied to an open chain, with the exact ... More
The Two-Impurity Anderson Model at Quantum CriticalityDec 18 2007Sep 27 2008We propose a realization of the two-impurity Anderson model in a double quantum-dot device. When charge transfer between the dots is suppressed the system exhibits a quantum phase transition, controlled by a surface of non-Fermi liquid fixed points parameterized ... More
The two-impurity Kondo model with spin-orbit interactionsMar 06 2009Aug 19 2009We study the two-impurity Kondo model (TIKM) in two dimensions with spin-orbit coupled conduction electrons. In the first part of the paper we analyze how spin-orbit interactions of Rashba as well as Dresselhaus type influence the Kondo and RKKY interactions ... More
Pairing and Density Correlations of Stripe Electrons in a Two-Dimensional AntiferromagnetJan 30 2003We study a one-dimensional electron liquid embedded in a 2D antiferromagnetic insulator, and coupled to it via a weak antiferromagnetic spin exchange interaction. We argue that this model may qualitatively capture the physics of a single charge stripe ... More
Superconductivity and Antiferromagnetism: Hybridization Impurities in a Two-Band Spin-Gapped Electron SystemApr 14 2000We present the exact solution of a one-dimensional model of a spin-gapped correlated electron system with hybridization impurities exhibiting both magnetic and mixed-valence properties. The host supports superconducting fluctuations, with a spin gap. ... More
Spin-orbit and impurity scattering in an integrable electron model: Exact results for dynamic correlationsMar 24 2014Jun 01 2014We introduce an integrable model of spin-polarized interacting electrons subject to a spin-conserving spin-orbit interaction. Using Bethe Ansatz and conformal field theory we calculate the exact large-time single-electron and density correlations and ... More
Kolmogorov complexity in the USSR (1975--1982): isolation and its endJul 11 2019These reminiscences are about the "dark ages" of algorithmic information theory in the USSR. After a great interest in this topic in 1960s and the beginning of 1970s the number of people working in this area in the USSR decreased significantly. At that ... More
Edge Dynamics in a Quantum Spin Hall State: Effects from Rashba Spin-Orbit InteractionApr 16 2010Jun 29 2010We analyze the dynamics of the helical edge modes of a quantum spin Hall state in the presence of a spatially non-uniform Rashba spin-orbit (SO) interaction. A randomly fluctuating Rashba SO coupling is found to open a scattering channel which causes ... More
Two-channel Anderson Impurity Model: Single-electron Green's function, self-energies, and resistivityNov 20 2004May 28 2005We compute exactly the low-energy single-electron Green's function, the impurity and electron self-energies, and the resistivity for the two-channel Anderson impurity model. These results are obtained by exploiting the boundary conformal field theory ... More
Properties of a Luttinger Liquid with Boundaries at Finite Temperature and SizeNov 20 1997We use bosonization methods to calculate the exact finite-temperature single-electron Green's function of a spinful Luttinger liquid confined by open boundaries. The corresponding local spectral density is constructed and analyzed in detail. The interplay ... More
Deformed Richardson-Gaudin modelFeb 19 2014The Richardson-Gaudin model describes strong pairing correlations of fermions confined to a finite chain. The integrability of the Hamiltonian allows for its eigenstates to be constructed algebraically. In this work we show that quantum group theory provides ... More
Energy Injection Episodes in Gamma Ray Bursts: The Light Curves and Polarization Properties of GRB 021004Sep 24 2004Several GRB afterglow light curves deviate strongly from the power law decay observed in most bursts. We show that these variations can be accounted for by including refreshed shocks in the standard fireball model previously used to interpret the overall ... More
Energy Injection in GRB Afterglow ModelsMay 11 2006We extend the standard fireball model, widely used to interpret gamma-ray burst (GRB) afterglow light curves, to include energy injections, and apply the model to the afterglow light curves of GRB 990510, GRB 000301C and GRB 010222. We show that discrete ... More
Two-Impurity Kondo Model: Spin-Orbit Interactions and EntanglementAug 08 2011Motivated by proposals to employ RKKY-coupled spins as building blocks in a solid-state quantum computer, we analyze how the RKKY interaction in a 2D electron gas is influenced by spin-orbit interactions. Using a two-impurity Kondo model with added Dresselhaus ... More
Critical Theory of the Two-Channel Anderson Impurity ModelJan 10 2003Feb 19 2004We construct the boundary conformal field theory that describes the low-temperature behavior of the two-channel Anderson impurity model. The presence of an exactly marginal operator is shown to generate a line of stable fixed points parameterized by the ... More
Addendum to ``Multichannel Kondo screening in a one-dimensional correlated electron system''Apr 14 2000This is an addendum to our previous work cond-mat/9705048 (published in Europhysics Letters 41, 213 (1998)), clarifying the construction of the two-particle scattering matrices used for studying the magnetic impurity behavior in a multichannel correlated ... More
Boundary Effects on Spectral Properties of Interacting Electrons in One DimensionNov 10 1995Feb 09 1996The single electron Green's function of the one-dimensional Tomonaga-Luttinger model in the presence of open boundaries is calculated with bosonization methods. We show that the critical exponents of the local spectral density and of the momentum distribution ... More
Synthesizing Majorana zero-energy modes in a periodically gated quantum wireDec 02 2015Jun 24 2016We explore a scheme for engineering a one-dimensional spinless p-wave superconductor hosting unpaired Majorana zero-energy modes, using an all-electric setup with a spin-orbit coupled quantum wire in proximity to an s-wave superconductor. The required ... More
Conformal Field Theory Approach to the Two-channel Anderson ModelFeb 27 2005The two-channel Anderson impurity model serves as a prototype for describing heavy-fermion materials with a possible mixed-valent regime with both quadrupolar and magnetic character. We report on the low-energy physics of the model, using a conformal ... More
Multichannel Kondo Screening in a One-Dimensional Correlated Electron SystemMay 06 1997Dec 08 1997We present the exact Bethe Ansatz solution of a multichannel model of one- dimensional correlated electrons coupled antiferromagnetically to a magnetic impurity of arbitrary spin S. The solution reveals that interactions in the bulk make the magnetic ... More
Deciphering the local Interstellar spectra of primary cosmic ray species with HelModApr 19 2018Local interstellar spectra (LIS) of primary cosmic ray (CR) nuclei, such as helium, oxygen, and mostly primary carbon are derived for the rigidity range from 10 MV to ~200 TV using the most recent experimental results combined with the state-of-the-art ... More
HelMod: A Comprehensive Treatment of the Cosmic Ray Transport Through the HeliosphereDec 26 2016HelMod is a code evaluating the transport of Galactic cosmic rays through the inner heliosphere down to Earth. It is based on a 2-D Monte Carlo approach and includes a general description of the symmetric and antisymmetric parts of the diffusion tensor, ... More
Fermi-LAT Observations of High- and Intermediate-Velocity Clouds: Tracing Cosmic Rays in the Halo of the Milky WayMay 16 2015It is widely accepted that cosmic rays (CRs) up to at least PeV energies are Galactic in origin. Accelerated particles are injected into the interstellar medium where they propagate to the farthest reaches of the Milky Way, including a surrounding halo. ... More
Optimal Linear Control over Channels with Signal-to-Noise Ratio ConstraintsMar 30 2012We consider a networked control system where a linear time-invariant (LTI) plant, subject to a stochastic disturbance, is controlled over a communication channel with colored noise and a signal-to-noise ratio (SNR) constraint. The controller is based ... More
Synthetic helical liquid in a quantum wireNov 19 2013Jun 04 2014We show that the combination of a Dresselhaus interaction and a spatially periodic Rashba interaction leads to the formation of a helical liquid in a quantum wire when the electron-electron interaction is weakly screened. The effect is sustained by a ... More
Controllable spin entanglement production in a quantum spin Hall ringMar 13 2015Jun 16 2015We study the entanglement production in a quantum spin Hall ring geometry where electrons of opposite spins are emitted in pairs from a source and collected in two different detectors. Postselection of coincidence detector events gives rise to entanglement ... More
Persistent currents through a quantum impurity: Protection through integrabilityDec 11 2006Sep 17 2007We consider an integrable model of a one-dimensional mesoscopic ring with the conduction electrons coupled by a spin exchange to a magnetic impurity. A symmetry analysis based on a Bethe Ansatz solution of the model reveals that the current is insensitive ... More
Local Spectral Weight of a Luttinger Liquid: Effects from Edges and ImpuritiesJul 31 2006We calculate the finite-temperature local spectral weight (LSW) of a Luttinger liquid with an "open" (hard wall) boundary. Close to the boundary the LSW exhibits characteristic oscillations indicative of spin-charge separation. The line shape of the LSW ... More
Metal-insulator transition in a quantum wire driven by a modulated Rashba spin-orbit couplingApr 13 2009Jul 28 2009We study the ground-state properties of electrons confined to a quantum wire and subject to a smoothly modulated Rashba spin-orbit coupling. When the period of the modulation becomes commensurate with the band filling, the Rashba coupling drives a quantum ... More
HelMod in the works: from direct observations to the local interstellar spectrum of cosmic-ray electronsJan 12 2018The local interstellar spectrum (LIS) of cosmic-ray (CR) electrons for the energy range 1 MeV to 1 TeV is derived using the most recent experimental results combined with the state-of-the-art models for CR propagation in the Galaxy and in the heliosphere. ... More
From Observations near the Earth to the Local Interstellar SpectraDec 29 2016Propagation of cosmic rays (CRs) from their sources to the observer is described mainly as plain diffusion at high energies, while at lower energies there are other physical processes involved, both in the interstellar space and in the heliosphere. The ... More
Double resonant processes in $χ^{(2)}$ nonlinear periodic mediaAug 07 2000In a one-dimensional periodic nonlinear $\chi^{(2)}$ medium, by choosing a proper material and geometrical parameters of the structure, it is possible to obtain two matching conditions for simultaneous generation of second and third harmonics. This leads ... More
Neutron Diffraction and Optics of a Noncentrosymmetric Crystal. New Feasibility of a Search for Neutron EDMApr 25 2005May 03 2005Recently strong electric fields (up to 10^9 V/cm) have been discovered, which affect the neutrons moving in noncentrosymmetric crystals. Such fields allow new polarization phenomena in neutron diffraction and optics and provide, for instance, a new feasibility ... More
Kondo Resonance in a Mesoscopic Ring Coupled to a Quantum Dot: Exact Results for the Aharonov-Bohm/Casher EffectsOct 06 2000Dec 11 2001We study the persistent currents induced by both the Aharonov-Bohm and Aharonov-Casher effects in a one-dimensional mesoscopic ring coupled to a side-branch quantum dot at Kondo resonance. For privileged values of the Aharonov-Bohm-Casher fluxes, the ... More
Morita invariance of the filter dimension and of the inequality of BernsteinOct 29 2006It is proved that the filter dimenion is Morita invariant. A direct consequence of this fact is the Morita invariance of the inequality of Bernstein: if an algebra $A$ is Morita equivalent to the ring $\CD (X)$ of differential operators on a smooth irreducible ... More
A remark on the Dixmier ConjectureNov 30 2018The Dixmier Conjecture says that every endomorphism of the (first) Weyl algebra $A_1$ (over a field of characteristic zero) is an automorphism, i.e., if $PQ-QP=1$ for some $P, Q \in A_1$ then $A_1 = K \langle P, Q \rangle$. The Weyl algebra $A_1$ is a ... More
On some basic properties of Leibniz algebrasFeb 14 2013Mar 01 2013This paper gives an overview of some basic properties of Leibniz algebras. Some of the results were known earlier, but in the article they are accompanied by new simple proofs. Some of the results are new. The article can be viewed as a digest or a mini-manual ... More
Namioka spaces and strongly Baire spacesJan 22 2016A notion of strongly Baire space is introduced. Its definition is a transfinite development of some equivalent reformulation of the Baire space definition. It is shown that every strongly Baire space is a Namioka space and every $\beta-\sigma$-unfavorable ... More
Dixmier's Problem 5 for the Weyl AlgebraMar 02 2004A proof is given to the Dixmier's 5'th problem for the Weyl algebra.
Criteria for a ring to have a left Noetherian left quotient ringAug 16 2015Two criteria are given for a ring to have a left Noetherian left quotient ring (this was an open problem since 70's). It is proved that each such ring has only finitely many maximal left denominator sets.
Three-page embeddings of singular knotsSep 19 2003Sep 20 2003Construction of a semigroup with 15 generators and 84 relations is given. The center of this semigroup is in one-to-one correspondence with the set of all isotopy classes of non-oriented singular knots (links with finitely many double intersections in ... More
Two scales in neutrino physicsJun 28 2011The problem of neutrino mass origin is considered on the phenomenological level. The assumption is made that the neutrino mass values depend on two dominant contributions with their characteristic scales. The neutrino mass values as well as the values ... More
Fundamental interactions in quantum phase space specified by extra dimensional constantsNov 14 2007Dec 18 2007A generalized algebra of quantum observables, depending on extra dimensional constants, is considered. Some limiting forms of the algebra are investigated and their possible applications to the descriptions of interactions of fundamental particles are ... More
Mass spectra of excited meson states consisting of u-, d-quarks and antiquarksApr 11 2005Mass spectra of excited meson states consisting of u-, d-quarks and antiquarks with I = 1 are considered. The comparison between the existing experimental data and the mass values evaluated with phenomenological formulae is carried out. Problems of identification ... More
Open Clusters IC 4665 and Cr 359 and a Probable Birthplace of the Pulsar PSR B1929+10Oct 01 2008Based on the epicyclic approximation, we have simulated the motion of the young open star clusters IC 4665 and Collinder 359. The separation between the cluster centers is shown to have been minimal 7 Myr ago, 36 pc. We have established a close evolutionary ... More
Hamiltonian anomalies of bound states in QEDMay 13 2012The Bound State in QED is described in systematic way by means of nonlocal irreducible representations of the nonhomogeneous Poincare group and Dirac's method of quantization. As an example of application of this method we calculate triangle diagram $Para-Positronium ... More
Chiral Phenomenological Relations between Rates of Rare Radiative Decay of Kaon to Pion and leptons and the meson FormfactorsApr 09 2010Oct 08 2010In framework of the chiral perturbation theory we obtain the phenomenological relations between decay branches of rare radiative kaon to pion and leptons $K^+ \to \pi^+ l^+ l^-$ and $K^0_S \to \pi^0 l^+ l^-$ and meson form factors. The comparison of these ... More
On the two body problem in the classical electrodynamicsJan 12 2015Jan 14 2015In this paper we propose an approach to the problem of two body motion in classical electrodynamics that takes into account the electromagnetic radiation and the radiation reaction forces. The resulting differential equations are solved numerically.
Surface plasmon excitation by a quantum oscillatorNov 08 2009Dec 03 2009Surface waves in a thin uniform metal film are described in terms of quantum electrodynamics.The interaction of surface waves with a quantum oscillator is discussed in the dipole approximation. The increase in the spontaneous emission rate of the excited ... More
Viscous dark fluidOct 01 2007Oct 15 2007The unified dark energy and dark matter model within the framework of a model of a continuous medium with bulk viscosity (dark fluid) is considered. It is supposed that the bulk viscosity coefficient is an arbitrary function of the Hubble parameter. The ... More
Letters of a Bi-Rationalist: VII. Ordered terminationJul 31 2006Nov 21 2006To construct a resulting model in LMMP is sufficient to prove existence of log flips and their termination for certain sequences. We prove that LMMP in dimension $d-1$ and termination of terminal log flips in dimension $d$ imply, for any log pair of dimension ... More
CPT Groups of Spinor Fields in de Sitter and Anti-de Sitter SpacesJan 30 2014Apr 02 2015$CPT$ groups for spinor fields in de Sitter and anti-de Sitter spaces are defined in the framework of automorphism groups of Clifford algebras. It is shown that de Sitter spaces with mutually opposite signatures correspond to Clifford algebras with different ... More
Cyclic structures of Cliffordian supergroups and particle representations of Spin_+(1,3)Jul 26 2012Supergroups are defined in the framework of $\dZ_2$-graded Clifford algebras over the fields of real and complex numbers, respectively. It is shown that cyclic structures of complex and real supergroups are defined by Brauer-Wall groups related with the ... More
Group averaging for de Sitter free fields in terms of hyperspherical functionsFeb 18 2010Jun 03 2011We study the convergence of inner products of free fields over the homogeneous spaces of the de Sitter group and show that the convergence of inner products in the of $N$-particle states is defined by the asymptotic behavior of hypergeometric functions. ... More
On integrable discretization of the inhomogeneous Ablowitz-Ladik modelOct 13 1999An integrable discretization of the inhomogeneous Ablowitz-Ladik model with a linear force is introduced. Conditions on parameters of the discretization which are necessary for reproducing Bloch oscillations are obtained. In particular, it is shown that ... More
Time-resolved spectroscopy and photometry of the dwarf nova FS Aurigae in quiescenceJun 21 2001Oct 26 2001We present results of non-simultaneous time-resolved photometric and spectroscopic observations of the little-studied dwarf nova FS Aur in quiescence. The spectrum of FS Aur shows strong and broad emission lines of hydrogen and HeI, and of weaker HeII ... More
Electroweak Phase Transition in Strong Magnetic Fields in the Standard Model of Elementary ParticlesDec 08 1999The electroweak phase transition in the magnetic and hypermagnetic fields is studied in the Standard Model on the base of investigation of symmetry behaviour within the consistent effective potential of the scalar and magnetic fields at finite temperature. ... More
Extinctions and distances of dark clouds from UGRIJHK photometry of red clump giants: the North America and Pelican nebulae complexNov 25 2009A possibility of applying 2MASS J, H, Ks, IPHAS r, i and MegaCam u, g photometry of red giants for determining distances to dark clouds is investigated. Red clump giants with a small admixture of G5-K1 and M2-M3 stars of the giant branch can be isolated ... More
Young Stars in the Camelopardalis Dust and Molecular Clouds. III. the GL 490 RegionMar 17 2008Using the infrared photometry data extracted from the 2MASS, IRAS and MSX databases, 50 suspected young stellar objects (YSOs) are selected from about 37500 infrared objects in the 3x3 deg area with the center at Galactic longitude 142.5 deg and latitude ... More
Young stars and clouds in CamelopardalisNov 18 2008Star formation in the Local spiral arm in the direction of the Galactic longitudes 132--158 deg is reviewed. Recent star-forming activity in this Milky Way direction is evidenced by the presence here of the Cam OB1 association and dense dust and molecular ... More
Surface modes and photonic modes in Casimir calculations for a compact cylinderDec 20 2007A rigorous formulation of the problem of calculating the electromagnetic vacuum energy of an infinite dielectric cylinder is discussed. It is shown that the physically relevant spectrum of electromagnetic excitations includes the surface modes and photonic ... More
On the model of the relativistic particle with curvature and torsionMay 29 1993Two integrals along the world trajectory of its curvature and torsion are added to the standard action for the point-like spinless relativistic particle. Since here the three-dimensional space-time is considered at the beginning, the torsion of the world ... More
On squaring the primary constraints in a generalized Hamiltonian dynamicsSep 02 1993Consideration of the model of the relativistic particle with curvature and torsion in the three-dimensional space-time shows that the squaring of the primary constraints entails a wrong result. The complete set of the Hamiltonian constraints arising here ... More
The nature of the Vela X-ray "jet"Dec 02 1999The nature of the Vela X-ray "jet", recently discovered by Markwardt & \"Ogelman (1995), is examined. It is suggested that the "jet" arises along the interface of domelike deformations of the Rayleigh-Taylor unstable shell of the Vela supernova remnant; ... More
Supernova remnant S147 and its associated neutron star(s)Aug 27 2005Apr 08 2006The supernova remnant S147 harbors the pulsar PSR J0538+2817 whose characteristic age is more than an order of magnitude greater than the kinematic age of the system (inferred from the angular offset of the pulsar from the geometric center of the supernova ... More