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Воскресенский, Дмитрий Николаевич

Организационные подразделения

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Институт лазерных и плазменных технологий

Стратегическая цель Института ЛаПлаз – стать ведущей научной школой и ядром развития инноваций по лазерным, плазменным, радиационным и ускорительным технологиям, с уникальными образовательными программами, востребованными на российском и мировом рынке образовательных услуг.

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Воскресенский

Имя

Дмитрий Николаевич

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Теперь показываю 1 - 10 из 18

Только метаданные
Vector-boson condensates, spin-triplet superfluidity of paired neutral and charged fermions, and 3P(2) pairing of nucleons
(2020) Voskresensky, D. N.; Воскресенский, Дмитрий Николаевич
After reminding of properties of the condensate of the complex scalar field in the external uniform magnetic field H, focus is made on the study of phases of the complex neutral vector-boson fields coupled with magnetic field by the Zeeman coupling and phases of the charged vector-boson fields. The systems may behave as nonmagnetic and ferromagnetic superfluids and ordinary and ferromagnetic superconductors. Response of these superfluid and superconducting systems occupying half of space on the external uniform static magnetic field H is thoroughly studied. Then the spin-triplet pairing of neutral fermions at conserved spin is considered. Novel phases are found. In external magnetic field, the phase with zero mean spin proves to be unstable to the formation of a phase with a nonzero spin. For a certain parameter choice ferromagnetic superfluid phases are formed already for H = 0, characterized by an own magnetic field h. For H > H-cr2, the spin-triplet pairing and ferromagnetic superfluidity continue to exist above the "old" phase transition critical temperature T-cr. Formation of domains is discussed. Next, spintriplet pairing of charged fermions is studied. Novel phases are found. Then, the 3P(2) nn pairing in neutron star matter is studied. Also, a 3P(2) pp pairing is considered. Numerical estimates are performed in the BCS weak-coupling limit and beyond it for the 3P(2) tin and pp pairings, as well as for the 3S(1) np pairing.
Только метаданные
Pion Softening and Pion Condensation
(2020) Voskresensky, D. N.; Воскресенский, Дмитрий Николаевич
© 2020, Pleiades Publishing, Ltd.Abstract: In this paper after a historical introduction I discuss ideas of a pion softening and pion condensation in a dense nuclear matter, in particular in neutron stars, and a conjecture about a feasible existence of abnormal nuclei.
Только метаданные
Hybrid equation of state with pasta phases, and third family of compact stars
(2019) Yasutake, N.; Ayriyan, A.; Grigorian, H.; Maruyama, T.; Maslov, K.; Blaschke, D.; Voskresensky, D. N.; Воскресенский, Дмитрий Николаевич
The effect of pasta phases on the quark-hadron phase transition is investigated for a set of relativistic mean-field equations of state for both hadron and quark matter. The results of the full numerical solution with pasta phases are compared with those of an interpolating construction used in previous works, for which we demonstrate an adequate description of the numerical results. A one-to-one mapping of the free parameter of the construction to the physical surface tension of the quark-hadron interface is obtained for which a fit formula is given. For each pair of quark and hadron matter models the critical value of the surface tension is determined, above which the phase transition becomes close to the Maxwell construction. This result agrees well with earlier theoretical estimates. The study is extended to neutron star matter in beta equilibrium with electrons and muons and is applied to investigate the effect of pasta phases on the structure of hybrid compact stars and the robustness of a possible third family solution.
Только метаданные
Charge and isospin fluctuations in a non-ideal pion gas with dynamically fixed particle number
(2021) Kolomeitsev, E. E.; Borisov, M. E.; Voskresensky, D. N.; Воскресенский, Дмитрий Николаевич
© 2021, The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature.We study the behavior of the non-ideal pion gas with the dynamically fixed number of particles, formed on an intermediate stage in ultra-relativistic heavy-ion collisions. The pion spectrum is calculated within the self-consistent Hartree approximation. General expressions are derived for cross-covariances of the number of various particle species in the pion gas of an arbitrary isospin composition. The behavior of the cross-variances is analyzed for the temperature approaching from above the maximal critical temperature of the Bose–Einstein condensation for the pion species a= ± , 0 , i.e. for T>maxTcra. It is shown that in the case of the system with equal averaged numbers of isospin species, the variance of the charge, Q= N+- N-, diverges at T→Tcr=Tcra, whereas variances of the total particle number, N= N++ N-+ N, and of a relative abundance of charged and neutral pions, G= (N++ N-) / 2 - N, remain finite in the critical point. Then, fluctuations are studied in the pion gas with small isospin imbalance 0 < | G| ≪ N and 0 < | Q| ≪ N and shifts of the effective masses, chemical potentials, and values of critical temperatures are calculated for various pion species, and the highest critical temperature, maxTcra is found, above which the pion system exists in the non-condensed phase. Various pion cross variances are calculated for T>maxTcra, which prove to be strongly dependent on the isospin composition of the system, whereas the variances of N and G are found to be independent on the isospin imbalance up to the term linear in G/N and Q/N.
Только метаданные
S -wave pion condensation in symmetric nuclear matter
(2022) Voskresensky, D. N.; Воскресенский, Дмитрий Николаевич
© 2022 American Physical Society. S-wave pion-nucleon interactions in the linear sigma model, and in Manohar-Georgi and Gasser-Sainio-Svarc models with finite number of terms in Lagrangians, as well as in a general phenomenological approach are reviewed. Subtleties associated with the current algebra theorems and field redefinitions are discussed. In the first and third models most likely the s-wave pion condensation in the isospin-symmetric matter does not occur at least up to high densities, whereas within the second model it may appear already at moderate densities. In the phenomenological approach two parametrizations of the s-wave pion-nucleon scattering amplitude and the pion polarization operator used in the literature are considered. The first parametrization employs the off-mass-shell amplitude and allows to fulfil the current algebra theorems. Using it the s-wave pion polarization operator in the isospin-symmetric matter is reconstructed within the gas approximation. With this pion polarization operator the s-wave pion condensation in the isospin-symmetric matter does not occur at least up to high densities. Second parametrization uses the on-mass-shell pion-nucleon scattering amplitude and does not satisfy the Adler and Weinberg conditions. With such a parametrization most likely the s-wave pion condensation in the isospin-symmetric matter may occur already at the nucleon density n≃(1.4-2.5)n0, where n0 is the density of the atomic nucleus, that should result in observable effects. Both parametrizations allow us to successfully describe the pion atom data.
Только метаданные
NICER data and a σ -field-dependent stiffness of the hadronic equation of state
(2024) Kolomeitsev, E. E.; Voskresensky, D. N.; Воскресенский, Дмитрий Николаевич
Только метаданные
Pion-sigma meson vortices in rotating systems
(2024) Voskresensky, D. N.; Воскресенский, Дмитрий Николаевич
Открытый доступ
Nonequilibrium Pion Distribution within the Zubarev Approach
(2020) Blaschke, D.; Ropke, G.; Voskresensky, D. N.; Morozov, V. G.; Воскресенский, Дмитрий Николаевич
We discuss how the non-equilibrium process of pion production within the Zubarev approach of the non-equilibrium statistical operator leads to a theoretical foundation for the appearance of a non-equilibrium pion chemical potential for the pion distribution function for which there is experimental evidence in experiments at the CERN LHC.
Открытый доступ
Electron-Positron Vacuum Instability in Strong Electric Fields. Relativistic Semiclassical Approach
(2021) Voskresensky, D. N.; Воскресенский, Дмитрий Николаевич
The instability of electron-positron vacuum in strong electric fields is studied. First, falling to the Coulomb center is discussed at Z>137/2 for a spinless boson and at Z>137 for electron. Subsequently, focus is concentrated on description of deep electron levels and spontaneous positron production in the field of a finite-size nucleus with the charge Z>Z(cr) similar or equal to 170. Next, these effects are studied in application to the low-energy heavy-ion collisions. Subsequently, we consider phenomenon of "electron condensation" on levels of upper continuum crossed the boundary of the lower continuum epsilon = -m in the field of a supercharged nucleus with Z >> Z(cr). Finally, attention is focused on many-particle problems of polarization of the quantum electrodynamics (QED) vacuum and electron condensation at ultra-short distances from a source of charge. We argue for a principal difference of cases, when the size of the source is larger than the pole size rpole, at which the dielectric permittivity of the vacuum reaches zero and smaller rpole. Some arguments are presented in favor of the logical consistency of QED. All of the problems are considered within the same relativistic semiclassical approach.
Открытый доступ
Structure formation during phase transitions in strongly interacting matter
(2023) Voskresensky, D. N.; Воскресенский, Дмитрий Николаевич
A broad range of problems associated with phase transitions in systems characterized by the strong interaction between particles and with formation of structures is reviewed. A general phenomenological mean-field model is constructed describing phase transitions of the first and the second order to the homogeneous, k0=0, and inhomogeneous, kв†’0в‰ 0 , states, the latter may occur even in case, when the interaction is translation-invariant. Due to fluctuations, the phase transition to the state, kв†’0в‰ 0, becomes the transition of the first order. Various specific features of the phase transitions to the state kв†’0в‰ 0 are considered such as the anisotropic spectrum of excitations, a possibility of the formation of various structures including running and standing waves, three-axis structures, the chiral waves, pasta mixed phases, etc. Next, a formal transition to hydrodynamical variables is performed. Then focus is made on description of the dynamics of the order parameter at the phase transitions to the states with kв†’0=0 and kв†’0в‰ 0. In case of the phase transition to the inhomogeneous state the dynamics has specific features. Next the non-ideal hydrodynamical description of the phase transitions of the liquidвЂ“gas type in nuclear systems is performed. The ordinary GinzburgвЂ“Landau model proves to be not applicable for description of an initial inertial stage of the seeds. Surface tension, viscosity and thermal conductivity are driving forces of phase transitions. Quasi-periodic structures are developed during the transitions. Next, the specific example of the pion condensation phase transition to the kв†’0в‰ 0 state in dense, cold or warm nuclear matter is considered and then the nuclear system at high temperature and small baryon chemical potential is studied, when baryons become completely blurred and light bosons, e.g., pions, may condense either in kв†’0=0 or kв†’0в‰ 0 states. Then, for the scalar collective modes the phenomena of the Pomeranchuk instability and the Bose condensation in kв†’0=0 or kв†’0в‰ 0 states are studied and a possibility of a metastable dilute nuclear state is discussed. Next, possibility of the condensation of Bose excitations in the kв†’0в‰ 0 state in the moving media is considered. Then BoseвЂ“Einstein condensation of pions with dynamically fixed number of particles is studied. Finally, specific purely non-equilibrium effects are demonstrated on an example of the sudden breaking up of the box filled by nucleons.