Results for "Yu. B. Ivanov"

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Baryon stopping signal for mixed phase formation in HICSep 23 2015It is argued that an irregularity in the baryon stopping is a natural consequence of onset of deconfinement occurring in the compression stage of a nuclear collision. It is an effect of the softest point inherent in an equation of state (EoS) with a deconfinement ... More
Alternative Scenarios of Relativistic Heavy-Ion Collisions: I. Baryon StoppingFeb 23 2013Simulations of relativistic heavy-ion collisions within the three-fluid model employing a purely hadronic equation of state (EoS) and two versions of the EoS involving deconfinement transition are presented. The latter are an EoS with the first-order ... More
Alternative Scenarios of Relativistic Heavy-Ion Collisions: III. Transverse Momentum SpectraNov 01 2013Jan 22 2014Transverse-mass spectra, their inverse slopes and mean transverse masses in relativistic collisions of heavy nuclei are analyzed in a wide range of incident energies 2.7 GeV $\le \sqrt{s_{NN}}\le$ 39 GeV. The analysis is performed within the three-fluid ... More
Alternative Scenarios of Relativistic Heavy-Ion Collisions: II. Particle ProductionApr 05 2013Jun 04 2013Particle production in relativistic collisions of heavy nuclei is analyzed in a wide range of incident energies 2.7 GeV $\le \sqrt{s_{NN}}\le$ 62.4 GeV. The analysis is performed within the three-fluid model employing three different equations of state ... More
Phase Evolution and Freeze-out within Alternative Scenarios of Relativistic Heavy-Ion CollisionsJun 05 2013Sep 18 2013Global evolution of the matter in relativistic collisions of heavy nuclei and the resulting global freeze-out parameters are analyzed in a wide range of incident energies 2.7 GeV $\le \sqrt{s_{NN}}\le$ 39 GeV. The analysis is performed within the three-fluid ... More
Baryon Stopping in Heavy-Ion Collisions at E_{lab}= 2--160 GeV/nucleonJan 05 2010May 25 2010It is argued that the experimentally observed baryon stopping may indicate (within the present experimental uncertainties) a non-monotonous behaviour as a function of the incident energy of colliding nuclei. This can be quantified by a midrapidity reduced ... More
Baryon Stopping as a Probe of Deconfinement Onset in Relativistic Heavy-Ion CollisionsNov 12 2012Feb 21 2013It is argued that an irregularity in the baryon stopping is a natural consequence of a phase transition occurring in the compression stage of a nuclear collision. It is a combined effect of the softest point inherent in an equation of state (EoS) with ... More
Baryon stopping as a signal of the mixed phase onsetJan 11 2011It is argued that the experimentally observed baryon stopping indicates a non-monotonous behaviour as a function of the incident energy of colliding nuclei. This can be quantified by a midrapidity reduced curvature of the net-proton rapidity spectrum ... More
Elliptic Flow of Protons and Antiprotons in Au+Au Collisions at $\sqrt{s_{NN}}$ = 7.7--62.4 GeV within Alternative Scenarios of Three-Fluid DynamicsApr 08 2013Analysis of elliptic flow of protons and antiprotons in Au+Au collisions is performed in a wide range of incident energies $\sqrt{s_{NN}}$ = 7.7--62.4 GeV. Simulations has been done within the three-fluid model employing a purely hadronic equation of ... More
Robustness of the Baryon-Stopping Signal for the Onset of Deconfinement in Relativistic Heavy-Ion CollisionsApr 15 2015May 28 2015The impact of the experimental acceptance, i.e. transverse-momentum ($p_T$) cut-off and limited rapidity region, on the earlier predicted irregularity in the excitation function of the baryon stopping is studied. This irregularity is a consequence of ... More
On freeze-out problem in relativistic hydrodynamicsOct 13 2008Dec 07 2008A finite unbound system which is equilibrium in one reference frame is in general nonequilibrium in another frame. This is a consequence of the relative character of the time synchronization in the relativistic physics. This puzzle was a prime motivation ... More
What we have learned so far from 3-fluid hydrodynamicsOct 19 2007Nov 14 2007Available data on heavy-ion collisions at AGS and SPS energies are analyzed using a 3-fluid dynamical model within a purely hadronic scenario. We investigate the problems met in reproducing these data within this scheme. In particular, we try to indicate ... More
Dynamical Freeze-out in 3-Fluid HydrodynamicsNov 27 2006Oct 19 2007Freeze-out procedure accepted in the model of 3-fluid dynamics (3FD) is analyzed. This procedure is formulated in terms of drain terms in hydrodynamic equations. Dynamics of the freeze-out is illustrated by 1-dimensional simulations. It is demonstrated ... More
Gapless Hartree-Fock Resummation Scheme for the O(N) ModelFeb 16 2005May 11 2005A modified selfconsistent Hartree-Fock approximation to the lambda*phi^4 theory with spontaneously broken O(N) symmetry is proposed. It preserves all the desirable features, like conservation laws and thermodynamic consistency, of the selfconsistent Dyson ... More
Directed Flow Indicates a Crossover Deconfinement Transition in Relativistic Nuclear CollisionsDec 04 2014Feb 27 2015Analysis of directed flow ($v_1$) of protons, antiprotons and pions in heavy-ion collisions is performed in the range of incident energies $\sqrt{s_{NN}}$ = 2.7--27 GeV. Simulations have been done within a three-fluid model employing a purely hadronic ... More
Transverse-Mass Effective Temperature in Heavy-Ion Collisions from AGS to SPSJul 31 2006Mar 10 2008Transverse-mass spectra in Au+Au and Pb+Pb collisions in incident energy range from 2A to 160A GeV are analyzed within the model of 3-fluid dynamics. It is shown that dynamical description of freeze-out, accepted in this model, naturally explains the ... More
Entropy Production and Effective Viscosity in Heavy-Ion CollisionsMay 09 2016Nov 24 2016Entropy production and an effective viscosity in central Au+Au collisions are estimated in a wide range of incident energies 3.3 GeV $\le \sqrt{s_{NN}}\le$ 39 GeV. The simulations are performed within a three-fluid model employing three different equations ... More
Elliptic Flow in Heavy-Ion Collisions at Energies $\sqrt{s_{NN}}=$ 2.7--39 GeVJan 10 2014Feb 27 2015The transverse-momentum integrated elliptic flow of charged particles at midrapidity, $v_2$(charged), and that of identified hadrons from Au+Au collisions are computed in a wide range of incident energies 2.7 GeV $\le \sqrt{s_{NN}}\le$ 39 GeV. The simulations ... More
Entropy Production and Effective Viscosity in Heavy-Ion CollisionsMay 09 2016Entropy production and an effective viscosity in central Au+Au collisions are estimated in a wide range of incident energies 3.3 GeV $\le \sqrt{s_{NN}}\le$ 39 GeV. The simulations are performed within a three-fluid model employing three different equations ... More
Collective Flow in Heavy-Ion Collisions from AGS to SPSJun 05 2006Aug 08 2006Collective transverse flow in heavy-ion collisions at incident energies E_{lab} = (1 -160)A GeV is analyzed within the model of 3-fluid dynamics (3FD). Simulations are performed with purely hadronic equation of state (EoS). At the AGS energies the flow ... More
Magnetic vortex as a ground state for sub-micron antiferromagnetic particlesMay 12 2009Jul 12 2009For submicron particles shaped as any axisymmetric body and made with standard canted antiferromagnet like hematite or iron borate, the ground state may comprise of a magnetic vortex with topologically non-trivial distribution of the sublattice magnetization ... More
Nonlocal Form of Quantum Off-Shell Kinetic EquationJan 09 2009A new nonlocal form of the off-shell kinetic equation is derived. While being equivalent to the Kadanoff--Baym and Botermans--Malfliet formulations in the range of formal applicability, it has certain advantages beyond this range. It possesses more accurate ... More
Non-Equilibrium 2PI Potential and Its Possible Application to Evaluation of Bulk ViscosityJul 15 2013Jul 18 2013Within non-equilibrium Green's function technique on the real-time contour and the two-particle-irreducable (2PI) $\Phi$-functional method, a non-equilibrium potential is introduced. It naturally generalizes the conventional thermodynamic potential with ... More
Transverse-Mass Spectra in Heavy-Ion Collisions at energies E_{lab} = 2--160 GeV/nucleonSep 05 2008Nov 18 2008Transverse-mass spectra of protons, pions and kaons produced in collisions of heavy nuclei are analyzed within the model of 3-fluid dynamics. It was demonstrated that this model consistently reproduces these spectra in wide ranges of incident energies ... More
Abrikosov vortex lattice nonlinear dynamics and its stability in the presence of weak defectsJan 31 2002Abrikosov vortex lattice dynamics in a superconductor with weak defects is studied taking into account gyroscopic (Hall) properties. It is demonstrated that interaction of the moving lattice with weak defects results in appearance of the additional drag ... More
Instability Criteria for Vibrations of a Vortex Subject to a Gyro-forceMar 21 2004Here we study the instability of the vortex motion caused by vortex velocity non-monotonous dependence of the friction force in the presence of a gyro-force. We demonstrate that even a weak gyro-force renders the condition for onset of instability more ... More
What can we learn from the directed flow in heavy-ion collisions at BES RHIC energies?Jan 15 2016Analysis of directed flow ($v_1$) of protons, antiprotons and pions in heavy-ion collisions is performed in the range of collision energies $\sqrt{s_{NN}}$ = 2.7--39 GeV. Simulations have been done within a three-fluid model employing a purely hadronic ... More
Estimation of the Shear Viscosity from 3FD Simulations of Au+Au Collisions at $\sqrt{s_{NN}}=$ 3.3--39 GeVApr 12 2016An effective shear viscosity in central Au+Au collisions is estimated in the range of incident energies 3.3 GeV $\le \sqrt{s_{NN}}\le$ 39 GeV. The simulations are performed within a three-fluid model employing three different equations of state with and ... More
Self-Consistent Approximations to Non-Equilibrium Many-Body TheoryJul 13 1998Within the non-equilibrium Green's function technique on the real time contour, the Phi-functional method of Baym is reviewed and generalized to arbitrary non-equilibrium many-particle systems. The scheme may be closed at any desired order in the number ... More
Prompt Contributions to the Dilepton Yield in Heavy Ion CollisionsNov 18 1999Feb 22 2000The mass spectrum is calculated for those dileptons which are produced in the early phase of a heavy ion collisions via the direct production NN -> (l^+)(l^-)X and via the Compton process GN -> (l^+)(l^-)X with prompt gluons radiated in preceding NN interactions. ... More
On the ground states of an array of magnetic dots in the vortex state and subject to a normal magnetic fieldNov 12 2001Dipole-dipole interactions in a square planar array of sub-micron magnetic disks (magnetic dots) have been studied theoretically. Under a normal magnetic field the ground-state of the array undergoes many structural transitions between the limiting chessboard ... More
Spin nematic state for a spin S=3/2 isotropic non-Heisenberg magnetJul 26 2009$S=3/2$ system with general isotropic nearest-neighbor exchange within a mean-field approximation possesses a magnetically ordered ferromagnetic state and antiferromagnetic state, and two different spin nematic states, with zero spin expectation values. ... More
Solitons in isotropic antiferromagnets: beyond a sigma modelDec 01 2007Isotropic antiferromagnets shows a reach variety of magnetic solitons with non-trivial static and dynamic properties. One-dimensional soliton elementary excitations have a periodic dispersion law. For two-dimensional case, planar antiferromagnetic vortices ... More
Incoherent quantum feedback control of collective light scattering by Bose-Einstein condensatesJan 10 2016It is well known that in the presence of a ring cavity the light scattering from a uniform atomic ensemble can become unstable resulting in the collective atomic recoil lasing. This is the result of a positive feedback due to the cavity. We propose to ... More
Probing chiral-odd GPD's in diffractive electroproduction of two vector mesonsSep 25 2002Nov 13 2002We consider the electroproduction of two vector mesons with a large rapidity gap between them on a nucleon target in the process $ \gamma ^* N \to \rho_1 \rho_2 N'$. We calculate the Born term for this process within the collinear factorization framework. ... More
Probing GPDs in Ultraperipheral CollisionsNov 13 2014Ultraperipheral collisions in hadron colliders give new opportunites to investigate the hadron stucture through exclusive photoproduction processes. We describe the possibility of measuring the Generalized Parton Distributions in the Timelike Compton ... More
Resonance Transport and Kinetic EntropyMay 14 1999Within the real-time formulation of nonequilibrium field theory, generalized transport equations are derived avoiding the standard quasiparticle approximation. They permit to include unstable particles into the transport scheme. In order to achieve a ... More
Self-consistent Approach to Off-Shell TransportMar 03 2003Mar 11 2003The properties of two forms of the gradient expanded Kadanoff--Baym equations, i.e. the Kadanoff--Baym and Botermans-Malfliet forms, suitable to describe the transport dynamics of particles and resonances with broad spectral widths, are discussed in context ... More
Towards a Quantum Transport Description of Particles with finite Mass WidthSep 16 1998Nov 27 1998The effects of the propagation of particles which have a finite life time and an according width in their mass spectrum are discussed in the context of transport descriptions. In the first part the coupling of soft photon modes to a source of charged ... More
Discommensurational and Inhomogeneous States Induced by a Strong Magnetic Field in Low-Dimensional AntiferromagnetsJun 24 2003Anisotropic antiferromagnetic systems of dimensionality greater than one in an external field are shown to exhibit a complicated array of ground states depending on the spin structure of the surface. The simplest structure that exhibits these effects ... More
GPDs in heavy meson production and Compton scatteringJan 27 2016Exclusive processes of heavy meson production and spacelike and timelike deeply virtual Compton scattering allow us to investigate the hadron structure in terms of Generalized Parton Distributions (GPDs). We review recent developments in the NLO description ... More
Mueller-Navelet jets in high-energy hadron collisionsSep 27 2012We consider within QCD collinear factorization the process $p+p\to {\rm jet} +{\rm jet} +X$, where two forward high-$p_T$ jets are produced with a large separation in rapidity $\Delta y$ (Mueller-Navelet jets [1]). The hard part of the reaction receives ... More
Relativistic Heavy-Ion Collisions within 3-Fluid Hydrodynamics: Hadronic ScenarioMar 31 2005Mar 15 2006A 3-fluid hydrodynamic model for simulating relativistic heavy-ion collisions is introduced. Alongside with two baryon-rich fluids, the new model considers time-delayed evolution of a third, baryon-free (i.e. with zero net baryonic charge) fluid of newly ... More
Equation of state of deconfined matter within dynamical quasiparticle descriptionOct 08 2004Dec 13 2004A simple quasiparticle model, motivated by lowest-order perturbative QCD, is proposed. It is applied to interpret the lattice QCD equation of state. A reasonable reproduction of the lattice data is obtained. In contrast to existing quasiparticle models, ... More
Exact Conservation Laws of the Gradient Expanded Kadanoff-Baym EquationsFeb 19 2001It is shown that the Kadanoff-Baym equations at consistent first-order gradient approximation reveal exact rather than approximate conservation laws related to global symmetries of the system. The conserved currents and energy-momentum tensor coincide ... More
Dynamics of Resonances in Strongly Interacting SystemsDec 12 2005The effects of the propagation of particles which have a finite life-time and an according broad distribution in their mass spectrum are discussed in the context of a transport descriptions. In the first part some example cases of mesonic modes in nuclear ... More
Collective modes for an array of magnetic dots in the vortex stateAug 29 2006The dispersion relations for collective magnon modes for square-planar arrays of vortex-state magnetic dots, having closure magnetic flux are calculated. The array dots have no direct contact between each other, and the sole source of their interaction ... More
Probing Transversity in Electroproduction of Two Vector MesonsJan 21 2004Electroproduction of two vector mesons with a large rapidity gap between them provides the first feasible selective access to chiral-odd GPDs. The scattering amplitude of the process $ \gamma ^* N \to \rho_L^0 \rho_T^+ N'$ may be represented as a convolution ... More
Diffractive electroproduction of two mesons separated by a large rapidity gapJul 07 2003We consider the process gamma^* N -> M_1 M_2 N' with a large rapidity gap between the two mesons M_1 and M_2. Within the QCD collinear approximation, the scattering amplitude may be written as a convolution of an impact factor describing the gamma^* -> ... More
Vector meson production in ultra-peripheral collisions at LHCJun 11 2007Vector meson production in ultra-peripheral collisions of heavy ions at LHC is calculated in VDM and color dipole approaches.
Elastic scattering of virtual photons via quark loop in Double-Logarithmic ApproximationAug 04 2017Mar 20 2018We calculate the amplitude of elastic photon-photon scattering via a single quark loop in the Double-Logarithmic Approximation, presuming all external photons to be off-shell and unpolarized.. At the same time we account for the running coupling effects. ... More
Renormalization of a gapless Hartree-Fock approximation to a theory with spontaneously broken O(N)-symmetryJun 16 2005Aug 09 2005The renormalization of a gapless Phi-derivable Hartree--Fock approximation to the O(N)-symmetric lambda*phi^4 theory is considered in the spontaneously broken phase. This kind of approach was proposed by three of us in a previous paper in order to preserve ... More
Probing GPDs in photoproduction processes at hadron collidersOct 22 2015Generalized parton distributions (GPDs) enter QCD factorization theorems for hard exclusive reactions. They encode rich information about hadron partonic structure. We explore a possibility to constrain GPDs in experiments at LHC considering two different ... More
Estimates of hyperon polarization in heavy-ion collisions at collision energies $\sqrt{s_{NN}}=$ 4--40 GeVMar 13 2019Global polarization of $\Lambda$ and $\bar{\Lambda}$ hyperons in Au+Au collisions at collision energies $\sqrt{s_{NN}}=$ 4-40 GeV in the midrapidity region and total polarization, i.e. averaged over all rapidities, are studied within the scope of the ... More
Exclusive vector meson electroproductionDec 19 2007We discuss exclusive vector meson electroproduction within the QCD collinear factorization framework. In Bjorken kinematics the amplitude factorizes in a convolution of the nonperturbative meson distribution amplitude and the generalized parton densities ... More
Light vector meson photoproduction at high $|t|$Jun 10 2000Nov 10 2000We have studied in perturbative QCD all independent helicity amplitudes describing the photoproduction of light vector mesons at large $t$. We found a new hard production mechanism which is related to the possibility for a real photon to fluctuate into ... More
Diffractive light vector meson production at large momentum transfersAug 17 1995Aug 18 1995The diffractive process $\gamma^*(Q^2) p\to V+X$ (where $V= \rho^0, \omega , \phi$ are the vector mesons, consisted of light quarks, $X$ represents the hadrons to that a proton dissociates) is studied. We consider the region of large momentum transfers, ... More
Diffractive Dissociation into Two JetsMay 12 2003We report a study of the processes of coherent a pion and a photon diffraction dissociation into two jets. The structure of non-factorizable contributions in these reactions is discussed. We argue that production of hard dijets by real photons can provide ... More
Exclusive production of dijets in QCDSep 30 2002We study in a framework of QCD collinear factorization the processes of a pion and a photon diffraction dissociation into two jets. The structure of non-factorizable contributions is discussed. We argue that coherent production of hard dijets by linearly ... More
QCD Factorization for the Pion Diffractive Dissociation Into Two JetsJul 26 2002We report a detailed study of the process of pion diffraction dissociation into two jets with large transverse momenta. We find that the standard collinear factorization does not hold in this reaction. The structure of non-factorizable contributions is ... More
Non-linear dynamics and two-dimensional solitons for spin $ S=1$ ferromagnets with biquadratic exchangeNov 27 2007We develop a consistent semiclassical theory of spin dynamics for an isotropic ferromagnet with a spin $ S=1$ taking into consideration both bilinear and biquadratic over spin operators exchange interaction. For such non-Heisenberg magnets, a peculiar ... More
Magnetoresistance of monolayer graphene with short-range scatteringAug 17 2015We present magnetotransport measurements at classical magnetic fields for three graphene monolayers with various levels of disorder. A square root magnetoresistance (SRMR) behavior is observed in one sample which has the characteristic sub-linear conductivity ... More
Influence of disordered edges on transport properties in grapheneMay 11 2016The influence of plasma etched sample edges on electrical transport and doping is studied. Through electrical transport measurements the overall doping and mobility are analyzed for mono- and bilayer graphene samples. As a result the edge contributes ... More
Magnon dispersions in quantum Heisenberg ferrimagnetic chains at zero temperatureJan 31 2000Within the Dyson-Maleev boson formalism, we study the zero-temperature magnon dispersions in a family of one-dimensional quantum Heisenberg ferrimagnets composed of two different spins $(S_1,S_2)$ in the elementary cell. It is shown that the spin-wave ... More
Fluctuations in confined nematic liquid crystals in a regime of critical wettingDec 05 1998Within the macroscopic Landau-de Gennes approach, we examine the Gaussian normal mode fluctuations of semi-infinite nematic liquid crystals in a regime of critical wetting. It is argued that surface free-energy potentials that strongly suppress the long-range ... More
A different approach to anisotropic spherical collapse with shear and heat radiationDec 13 2015Jan 23 2016In order to study the type of collapse, mentioned in the title, we introduce a physically meaningful object, called the horizon function. It directly enters the expressions for many of the stellar characteristics. The main junction equation, which governs ... More
Static charged perfect fluid spheres in general relativityMar 21 2002Interior perfect fluid solutions for the Reissner-Nordstrom metric are studied on the basis of a new classification scheme. General formulas are found in many cases. Explicit new global solutions are given as illustrations. Known solutions are briefly ... More
Maximum bounds on the surface redshift of anisotropic starsJan 29 2002Mar 06 2002It is shown that for realistic anisotropic star models the surface redshift can not exceed the values 3.842 or 5.211 when the tangential pressure satisfies the strong or the dominant energy condition respectively. Both values are higher than 2, the bound ... More
Towards a regular type N vacuum gravitational fieldOct 21 1999An exact twisting type N vacuum solution is found. It has regular gauge and curvature invariants and decays to flat spacetime for big retarded times.
Evolving spheres of shear-free anisotropic fluidMar 22 2011The fluid models mentioned in the title are studied in a modified approach, based on two formulas for the mass function. All characteristics of the fluid are expressed through a master potential, satisfying an ordinary second order differential equation. ... More
The importance of anisotropy for relativistic fluids with spherical symmetryMay 06 2010It is shown that an effective anisotropic spherically symmetric fluid model with heat flow can absorb the addition to a perfect fluid of pressure anisotropy, heat flow, bulk and shear viscosity, electric field and null fluid. In most cases the induction ... More
Colliding axisymmetric pp-wavesMay 22 1997Oct 21 1997An exact solution is found describing the collision of axisymmetric pp-waves with M=0. They are impulsive in character and their coordinate singularities become point curvature singularities at the boundaries of the interaction region. The solution is ... More
Diagonalization of pp-wavesMay 21 1997A coordinate transformation is found which diagonalizes the axisymmetric pp-waves. Its effect upon concrete solutions, including impulsive and shock waves, is discussed.
Colliding plane waves with W=M=0May 13 1997It is shown that there are three vacuum and one electrovacuum solutions of diagonal plane waves with M=0 and constant Maxwell scalars. Namely, these are the single wave, Stoyanov, Babala and Bell-Szekeres solutions. A comparison is made with the planar ... More
Examination of the directed flow puzzle in heavy-ion collisionsApr 10 2014Jul 14 2014Recent STAR data for the directed flow of protons, antiprotons, and charged pions obtained within the beam energy scan program are analyzed within the parton-hadron-string-dynamics (PHSD and HSD) transport models and a 3-fluid hydrodynamics (3FD) approach. ... More
Topological solitons in highly anisotropic two dimensional ferromagnetsJun 10 2006e study the solitons, stabilized by spin precession in a classical two--dimensional lattice model of Heisenberg ferromagnets with non-small easy--axis anisotropy. The properties of such solitons are treated both analytically using the continuous model ... More
Vortex ground state for small arrays of magnetic particles with dipole couplingJan 17 2013We show that a magnetic vortex is the ground state of an array of magnetic particles shaped as a hexagonal fragment of a triangular lattice, even for an small number of particles in the array $N \leq 100$. The vortex core appears and the symmetry of the ... More
Magnetic vortex as a ground state for micron-scale antiferromagnetic samplesApr 05 2010Here we consider micron-sized samples with any axisymmetric body shape and made with a canted antiferromagnet, like hematite or iron borate. We find that its ground state can be a magnetic vortex with a topologically non-trivial distribution of the sublattice ... More
Quantum simulations of strongly coupled quark-gluon plasmaJun 17 2010Nov 11 2010A strongly coupled quark-gluon plasma (QGP) of heavy constituent quasiparticles is studied by a path-integral Monte-Carlo method, which improves the corresponding classical simulations by extending them to the quantum regime. It is shown that this method ... More
Three-Fluid Simulations of Relativistic Heavy-Ion CollisionsSep 03 2003Sep 05 2003A relativistic 3-fluid 3D hydrodynamic model has been developed for describing heavy-ion collisions at incident energies between few and $\sim$ 200 A$\cdot$GeV. In addition to two baryon-rich fluids which simulate mutually decelerating counterflows of ... More
Medium effects on freeze-out of light clusters at NICA energiesDec 20 2017We estimate the chemical freeze-out of light nuclear clusters for NICA energies of above 2 A GeV. On the one hand we use results from the low energy domain of about 35 A MeV, where medium effects have been shown to be important to explain experimental ... More
High Energy exclusive Leptoproduction of the rho-meson: Theory and PhenomenologyJun 15 2012We describe the hard leptoproduction of transversally polarized rho-meson, up to twist 3 accuracy, including 2- and 3- particles Fock-states, in the HERA kinematics of high center-of-mass energy. We first build a model based on a simple approach to the ... More
A phenomenological study of helicity amplitudes of high energy exclusive leptoproduction of the rho mesonMay 09 2011Sep 13 2011We apply a previously developed scheme to consistently include the twist-3 distribution amplitudes for transversely polarized rho meson in order to evaluate, in the framework of kT factorization, the helicity amplitudes for exclusive leptoproduction of ... More
Soft Modes, Resonances and Quantum TransportMay 31 2000Jun 15 2000Effects of the propagation of particles, which have a finite life-time and an according width in their mass spectrum, are discussed in the context of transport description. First, the importance of coherence effects (Landau-Pomeranchuk-Migdal effect) ... More
The next-to-leading order jet vertex for Mueller-Navelet and forward jets revisitedDec 16 2011Feb 01 2012We recalculate, completely within the original BFKL approach and at the next-to-leading order, the jet vertex relevant for the production of Mueller-Navelet jets in proton collisions and of forward jets in DIS. We consider both processes with incoming ... More
Electroproduction of Charmonia off NucleiFeb 22 2002Feb 26 2002In a recent publication we have calculated elastic charmonium production in ep collisions employing realistic charmonia wave functions and dipole cross sections and have found good agreement with the data in a wide range of s and Q^2. Using the ingredients ... More
Dyson-Schwinger Equation Approach to the QCD Deconfinement Transition and J/Psi DissociationFeb 04 2000We consider an extension of the finite-temperature Dyson-Schwinger equation (DSE) approach to heavy mesons and quarkonia and apply it to calculate the cross section for the J/Psi breakup reaction J/Psi + pi --> D + D. We study the effects of chiral symmetry ... More
Hard exclusive electroproduction of rhoT at twist 3Jun 08 2010Exclusive processes in hard electroproduction are one of the best place for understanding QCD in view of its factorization properties. In particular, in the limit of asymptotic gamma* p center of mass energy, they give an access to the perturbative Regge ... More
Colliding beams of lightSep 12 2002Dec 28 2002The stationary gravitational field of two identical counter-moving beams of pure radiation is found in full generality. The solution depends on an arbitrary function and a parameter which sets the scale of the energy density. Some of its properties are ... More
Relativistic static fluid spheres with a linear equation of stateJul 10 2001It is shown that almost all known solutions of the kind mentioned in the title are easily derived in a unified manner when a simple ansatz is imposed on the metric. The Whittaker solution is an exception, replaced by a new solution with the same equation ... More
Static charged fluid spheres in general relativitySep 04 2001Interior perfect fluid solutions for the Reissner-Nordstrom metric are studied on the basis of a new classification scheme. It specifies which two of the fluid's characteristics are given functions and picks up accordingly one of the three main field ... More
Spin-wave series for quantum one-dimensional ferrimagnetsDec 01 1997Second-order spin-wave expansions are used to compute the ground-state energy and sublattice magnetizations of the quantum one-dimensional Heisenberg ferrimagnet with nearest-neighbor antiferromagnetic interactions and two types of alternating sublattice ... More
Behavior of bounded solutions of quasilinear elliptic equations on Riemannian manifoldsDec 09 2007Dec 12 2007This paper deals with bounded solutions of quasilinear elliptic equations on Riemannian manifolds satisfying special condition.
Ramified automorphic induction and zero-dimensional affine Deligne-Lusztig varietiesDec 23 2015To any connected reductive group G over a non-archimedean local field F (of characteristic p > 0) and to any maximal torus T of G, we attach a family of extended affine Deligne-Lusztig varieties (and families of torsors over them) over the residue field ... More
Inertial longitudinal magnetization reversal for non-Heisenberg ferromagnetsJun 05 2013Jun 30 2013We analyze theoretically the novel pathway of ultrafast spin dynamics for ferromagnets with high enough single-ion anisotropy (non-Heisenberg ferromagnets). This longitudinal spin dynamics includes the coupled oscillations of the modulus of the magnetization ... More
Color path-integral Monte-Carlo simulations of quark-gluon plasma: Thermodynamic and transport propertiesOct 09 2012Jan 29 2013Based on the quasiparticle model of the quark-gluon plasma (QGP), a color quantum path-integral Monte-Carlo (PIMC) method for calculation of thermodynamic properties and -- closely related to the latter -- a Wigner dynamics method for calculation of transport ... More
Elliptic Flow and Dissipation in Heavy-Ion Collisions at E_{lab} = (1--160)A GeVJul 23 2009Nov 24 2009Elliptic flow in heavy-ion collisions at incident energies $E_{lab}\simeq$ (1--160)A GeV is analyzed within the model of 3-fluid dynamics (3FD). We show that a simple correction factor, taking into account dissipative affects, allows us to adjust the ... More
Electroproduction of Charmonia off Protons and NucleiDec 20 2002Dec 20 2002Elastic virtual photoproduction of charmonia on nucleons is calculated in a parameter free way with the light-cone dipole formalism and the same input: factorization in impact parameters, light-cone wave functions for the photons and the charmonia, and ... More
Optical and magnetic properties of ZnCoO layersAug 09 2013Optical and magneto-optical properties of ZnCoO films grown at low temperature by Atomic Layer Deposition are discussed. Strong wide band absorption, with onset at about 2.4 eV, is observed in ZnCoO in addition to Co-related intra-shell transitions. This ... More
Theory and phenomenology of helicity amplitudes for high energy exclusive leptoproduction of the rho-mesonJul 10 2012We review here two approaches to describe hard leptoproduction of transversally polarized rho-meson, based on recent calculation of the gamma*T -> rhoT impact factor up to twist 3 accuracy in the collinear factorization frame, including 2- and 3- particles ... More