Персона: Воскресенский, Дмитрий Николаевич
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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
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Дмитрий Николаевич
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Теперь показываю 1 - 5 из 5
- ПубликацияТолько метаданныеHybrid 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 НиколаевичThe 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.
- ПубликацияОткрытый доступQuark-hadron pasta in neutron stars(2019) Yasutake, N.; Ayriyan, A.; Grigorian, H.; Maruyama, T.; Maslov, K.; Blaschke, D.; Voskresensky, D.; Воскресенский, Дмитрий Николаевич© 2019 Author(s).Pasta structures are studied for the quark-hadron phase transition. We find the useful correlation, which can provide the physical limits of the surface energy between quark and hadron matter, namely "σc-Pc relation". Our hadron model is based on the relativistic mean field theory with a general formulation, which can reproduce the traditional Walecka-type model, non-linear Walecka-type model, etc. without changing the Lagrangian. The quark model is the string-flip model with the quasi-particle approximation and excluded volume effects. We also find that the analytic estimation derived from the liner-approximation is consistent with the numerical results. It means that we can roughly estimate the physical limit of the surface tension without any special numerical techniques, when we prepare uniform quark matter and hadron matter. We expect that the above behaviors can be help to reduce numerical costs to make huge EOS tables for astrophysical simulations, and would be a useful index to understand the quark-hadron phase transition.
- ПубликацияОткрытый доступRMF models with σ -scaled hadron masses and couplings for the description of heavy-ion collisions below 2 A GeV(2019) Maslov, K. A.; Voskresensky, D. N.; Воскресенский, Дмитрий Николаевич© 2019, Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature.Within the relativistic mean-field framework with hadron masses and coupling constants dependent on the mean scalar field we study properties of nuclear matter at finite temperatures, baryon densities and isospin asymmetries relevant for heavy-ion collisions at laboratory energies below 2 A GeV. Previously constructed (KVORcut-based and MKVOR-based) models for the description of the cold hadron matter, which differ mainly by the density dependence of the nucleon effective mass and symmetry energy, are extended for finite temperatures. The baryon equation of state, which includes nucleons and Δ resonances is supplemented by the contribution of the pion gas described either by the vacuum dispersion relation or with taking into account the s-wave pion-baryon interaction. Distribution of the charge between components is found. Thermodynamical characteristics on the T-n plane are considered. The energy-density and entropy-density isotherms are constructed and a dynamical trajectory of the hadron system formed in heavy-ion collisions is described. The effects of taking into account the Δ isobars and the s-wave pion-nucleon interaction on pion differential cross sections, pion to proton and π-/ π+ ratios are studied. The liquid-gas first-order phase transition is studied within the same models in isospin-symmetric and asymmetric systems. We demonstrate that our models yield thermodynamic characteristics of the phase transition compatible with available experimental results. In addition, we discuss the scaled variance of baryon and electric charge in the phase transition region. Effect of the non-zero surface tension on spatial redistribution of the electric charge is considered for a possible application to heavy-ion collisions at low energies.
- ПубликацияОткрытый доступDouble charged heavy constituents of dark atoms and superheavy nuclear objects(2019) Khlopov, M. Y.; Gani, V. A.; Voskresensky, D. N.; Гани, Вахид Абдулович; Воскресенский, Дмитрий Николаевич© 2019 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the »https://creativecommons.org/licenses/by/4.0/» Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3. We consider the model of composite dark matter assuming stable particles of charge -2 bound with primordial He nuclei by the Coulomb force in OHe atoms. We study the capture of such dark atoms in matter and propose the possibility of the existence of stable O-enriched superheavy nuclei and O nuclearites, in which heavy O dark matter fermions are bound by electromagnetic forces with ordinary nuclear matter. OHe atoms accumulation in stars and its possible effect on stellar evolution is also considered, extending the set of indirect probes for composite dark matter.
- ПубликацияОткрытый доступSuperheavy objects composed of nuclear and dark matter(2019) Gani, V. A.; Khlopov, M. Y.; Voskresensky, D. N.; Гани, Вахид Абдулович; Хлопов, Максим Юрьевич; Воскресенский, Дмитрий Николаевич© Published under licence by IOP Publishing Ltd.We consider a model of OHe atomic dark matter formed by Coulomb binding of the hypothetical stable double-charged massive O -- particles with nuclei of primordial helium. Such a dark matter can be captured by ordinary matter forming superheavy nuclei. We propose a possibility of self-bound by nuclear and electromagnetic interaction O-nuclearites as well as more massive gravitating ones and discuss effect of accumulation of OHe atoms in stars and their effect in stellar evolution.