Výsledky vyhľadávania

Nájdených záznamov: 18  
Vaša požiadavka: Kľúčové slovo = "neutron stars"
  1. NázovCharged rho-meson condensation in neutron stars
    Aut.údajeEvgeni E. Kolomeitsev, K. A. Maslov ... [et al.]
    Autor Kolomeitsev Evgeni E. 1970- (34%) UMBFP06 - Katedra fyziky
    Spoluautori Maslov K. A. (33%)
    Voskresensky Dmitri (33%)
    Zdroj.dok. Nuclear Physics A. Vol. 970, (2018), pp. 291-315. - Amsterdam : Elsevier B.V., 2018
    Kľúč.slová neutron stars   equation of state   condensation  
    Jazyk dok.angličtina
    KrajinaHolandsko
    Systematika 53
    AnotáciaWe extend relativistic mean-field models with hadron masses and meson–baryon coupling constants dependent on the scalar field σ, including hyperons and (1232)baryons, to incorporate a possibility of the charged ρmeson condensation in neutron star matter. The influence of the ρ−condensation on the equation of state proves to be strongly model dependent. In our models of one type (KVORcut-based ones) the ρ−condensation arises by a second-order phase transition above a critical density and the maximum value of the neutron star mass diminishes only slightly. The matter composition changes more significantly. In our models of other type (MKVOR*-based ones), if the system is considered at fixed density, the ρ−condensation arises by a second-order phase transition at the baryon density n =n(II)c,ρand at a slightly higher density n =n(I)c,ρthere occurs a first-order phase transition. In a neutron star matter starting with a density n <n(II)c,ρthere appears a region of a mixed phase, or the system is described by Maxwell construction, that results in a substantial decrease of the value of the maximum neutron star mass. Nevertheless in the models under consideration the observational constraint on the maximum neutron star mass is fulfilled. Besides, in MKVOR*-based models the appearance of the ρ−condensate is accompanied by a strong rearrangement of the matter composition. Dependence of the results on a choice of the ρmeson scaling functions for the effective ρmeson mass and coupling constants is also investigated
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    Kategória publikačnej činnosti ADC
    Číslo archívnej kópie43905
    Katal.org.BB301 - Univerzitná knižnica Univerzity Mateja Bela v Banskej Bystrici
    Báza dátxpca - PUBLIKAČNÁ ČINNOSŤ
    OdkazyPERIODIKÁ-Súborný záznam periodika
    nerozpoznaný

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  2. NázovOn cooling of neutron stars with a stiff equation of state including hyperons
    Aut.údajeHovik Grigorian, Evgeni E. Kolomeitsev ... [et al.]
    Autor Grigorian Hovik (25%)
    Spoluautori Kolomeitsev Evgeni E. 1970- (25%) UMBFP06 - Katedra fyziky
    Maslov Konstantin A. (25%)
    Voskresensky Dmitri (25%)
    Zdroj.dok. Universe. Vol. 4, no. 2 (2018), pp. 1-6. - Basel : Multidisciplinary Digital Publishing Institute, 2018
    Kľúč.slová equation of state   neutron stars   neutrína - neutrinos  
    Jazyk dok.angličtina
    KrajinaŠvajčiarsko
    Systematika 53
    AnotáciaExploiting a stiff equation of state of the relativistic mean-field model MKVORHf with sigma-scaled hadron effective masses and couplings, including hyperons, we demonstrate that the existing neutron-star cooling data can be appropriately described within “the nuclear medium cooling scenario” under the assumption that different sources have different masses
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    Kategória publikačnej činnosti ADM
    Číslo archívnej kópie43911
    Katal.org.BB301 - Univerzitná knižnica Univerzity Mateja Bela v Banskej Bystrici
    Báza dátxpca - PUBLIKAČNÁ ČINNOSŤ
    OdkazyPERIODIKÁ-Súborný záznam periodika
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  3. NázovCharged rho meson condensate in neutron stars within RMF models
    Aut.údajeKonstantin A. Maslov, Evgeni E. Kolomeitsev, Dmitry N. Voskresensky
    Autor Maslov Konstantin A. (34%)
    Spoluautori Kolomeitsev Evgeni E. 1970- (33%) UMBFP06 - Katedra fyziky
    Voskresensky Dmitri (33%)
    Zdroj.dok. Universe. Vol. 4, no. 1 (2018), pp. 1-8. - Basel : Multidisciplinary Digital Publishing Institute, 2018
    PoznámkaPríspevok je evidovaný v databáze WoS.
    Kľúč.slová neutron stars   equation of state   rho meson condensation   maximum mass   Delta resonances  
    Jazyk dok.angličtina
    KrajinaŠvajčiarsko
    Systematika 53
    AnotáciaKnowledge of the equation of state (EoS) of cold and dense baryonic matter is essential for the description of properties of neutron stars (NSs). With an increase of the density, new baryon species can appear in NS matter, as well as various meson condensates. In previous works, we developed relativistic mean-field (RMF) models with hyperons and Δ -isobars, which passed the majority of known experimental constraints, including the existence of a 2 M ⊙ neutron star. In this contribution, we present results of the inclusion of ρ − -meson condensation into these models. We have shown that, in one class of the models (so-called KVOR-based models, in which the additional stiffening procedure is introduced in the isoscalar sector), the condensation gives only a small contribution to the EoS. In another class of the models (MKVOR-based models with additional stiffening in isovector sector), the condensation can lead to a first-order phase transition and a substantial decrease of the NS mass. Nevertheless, in all resulting models, the condensation does not spoil the description of the experimental constraints
    URLhttps://www.mdpi.com/2218-1997/4/1/1
    Kategória publikačnej činnosti AFC
    Číslo archívnej kópie43907
    Katal.org.BB301 - Univerzitná knižnica Univerzity Mateja Bela v Banskej Bystrici
    Báza dátxpca - PUBLIKAČNÁ ČINNOSŤ
    OdkazyPERIODIKÁ-Súborný záznam periodika
    nerozpoznaný

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  4. NázovThe effect of inclusion of delta resonances in relativistic mean-field model with scaled hadron masses and coupling constants
    Aut.údajeK. A. Maslov, E. E. Kolomeitsev, D. N. Voskresensky
    Autor Maslov Konstantin A. (1%)
    Spoluautori Kolomeitsev Evgeni E. 1970- (98%) UMBFP06 - Katedra fyziky
    Voskresensky Dmitri (1%)
    Zdroj.dok. Journal of Physics: Conference Series. Vol. 798 (2017), pp. 1-5. - Bristol : IOP Publishing, 2017 ; International conference on particle physics and astrophysics ICPPA 2017 medzinárodná konferencia
    Kľúč.slová astrofyzika - astrophysics   neutron stars   relativita - relativity  
    Jazyk dok.angličtina
    KrajinaVeľká Británia
    Systematika 53
    Anotácia© Published under licence by IOP Publishing Ltd.Knowledge of the equation of state of the baryon matter plays a decisive role in the description of neutron stars. With an increase of the baryon density the filling of Fermi seas of hyperons and Δ isobars becomes possible. Their inclusion into standard relativistic mean-field models results in a strong softening of the equation of state and a lowering of the maximum neutron star mass below the measured values. We extend a relativistic mean-field model with scaled hadron masses and coupling constants developed in our previous works and take into account now not only hyperons but also the Δ isobars. We analyze available empirical information to put constraints on coupling constants of Δs to mesonic mean fields. We show that the resulting equation of state satisfies majority of presently known experimental constraints.
    Kategória publikačnej činnosti AFC
    Číslo archívnej kópie39068
    Katal.org.BB301 - Univerzitná knižnica Univerzity Mateja Bela v Banskej Bystrici
    Báza dátxpca - PUBLIKAČNÁ ČINNOSŤ
    OdkazyPERIODIKÁ-Súborný záznam periodika
    nerozpoznaný

    nerozpoznaný

  5. NázovSymmetry parameter constraints from a lower bound on neutron-matter energy
    Aut.údajeIngo Tews ... [et al.]
    Autor Tews Ingo (1%)
    Spoluautori Lattimer James M. (1%)
    Ohnishi Akira (1%)
    Kolomeitsev Evgeni E. 1970- (97%) UMBFP06 - Katedra fyziky
    Zdroj.dok. The Astrophysical Journal. Vol. 848, no. 2 (2017), pp. [1-15]. - Bristol : IOP Publishing - Institute of Physics Publishing, 2017
    Kľúč.slová neutron stars   equation of state   symmetry energy  
    Jazyk dok.angličtina
    KrajinaVeľká Británia
    Systematika 53
    AnotáciaWe propose the existence of a lower bound on the energy of pure neutron matter (PNM) on the basis of unitary-gas considerations. We discuss its justification from experimental studies of cold atoms as well as from theoretical studies of neutron matter. We demonstrate that this bound results in limits to the density-dependent symmetry energy, which is the difference between the energies of symmetric nuclear matter and PNM. In particular, this bound leads to a lower limit to the volume symmetry energy parameter S 0. In addition, for assumed values of S 0 above this minimum, this bound implies both upper and lower limits to the symmetry energy slope parameter L ,which describes the lowest-order density dependence of the symmetry energy. A lower bound on neutron-matter incompressibility is also obtained. These bounds are found to be consistent with both recent calculations of the energies of PNM and constraints from nuclear experiments. Our results are significant because several equations of state that are currently used in astrophysical simulations of supernovae and neutron star mergers, as well as in nuclear physics simulations of heavy-ion collisions, have symmetry energy parameters that violate these bounds. Furthermore, below the nuclear saturation density, the bound on neutron-matter energies leads to a lower limit to the density-dependent symmetry energy, which leads to upper limits to the nuclear surface symmetry parameter and the neutron-star crust–core boundary. We also obtain a lower limit to the neutron-skin thicknesses of neutron-rich nuclei. Above the nuclear saturation density, the bound on neutron-matter energies also leads to an upper limit to the symmetry energy, with implications for neutron-star cooling via the direct Urca process
    Kategória publikačnej činnosti ADC
    Číslo archívnej kópie40513
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    MENEZES, Debora Peres. A neutron star is born. In Universe. ISSN 2218-1997, 2021, vol. 7, no. 8, pp. 1-41.
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    VARTANYAN, David - LAPLACE, Eva - RENZO, Mathieu - GOTBERG, Ylva - BURROWS, Adam - DE MINK, Selma E. Binary-stripped stars as core-collapse supernovae progenitors. In Astrophysical journal letters. ISSN 2041-8205, 2021, vol. 916, no. 1, pp. 1-10.
    NEWTON, William G. - CROCOMBE, Gabriel. Nuclear symmetry energy from neutron skins and pure neutron matter in a Bayesian framework. In Physical review C. ISSN 2469-9985, 2021, vol. 103, no. 6, pp. 1-21.
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    POWELL, Jade - MUELLER, Bernhard - HEGER, Alexander. The final core collapse of pulsational pair instability supernovae. In Monthly notices of the royal astronomical society. ISSN 0035-8711, 2021, vol. 503, no. 2, pp. 2108-2122.
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    JOKELA, Niko - JARVINEN, Matti - NIJS, Govert - REMES, Jere. Unified weak and strong coupling framework for nuclear matter and neutron stars. In Physical review D. ISSN 2470-0010, 2021, vol. 103, no. 8, pp. [1-23].
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    Katal.org.BB301 - Univerzitná knižnica Univerzity Mateja Bela v Banskej Bystrici
    Báza dátxpca - PUBLIKAČNÁ ČINNOSŤ
    OdkazyPERIODIKÁ-Súborný záznam periodika
    nerozpoznaný

    nerozpoznaný

  6. NázovDelta isobars in relativistic mean-field models with sigma-scaled hadron masses and couplings
    Aut.údajeE. E. Kolomeitsev, K. A. Maslov, D. N. Voskresensky
    Autor Kolomeitsev Evgeni E. 1970- (98%) UMBFP06 - Katedra fyziky
    Spoluautori Maslov Konstantin A. (1%)
    Voskresensky Dmitri (1%)
    Zdroj.dok. Nuclear Physics A. Vol. 961 (2017), pp. 106-141. - Amsterdam : Elsevier B.V., 2017
    Kľúč.slová neutron stars   equation of state   heavy ion collisions  
    Jazyk dok.angličtina
    KrajinaHolandsko
    Systematika 53
    AnotáciaWe extend the relativistic mean-field models with hadron masses and meson-baryon coupling constants dependent on the scalar sigma field, studied previously to incorporate Delta(1232) baryons. Available empirical information is analyzed to put constraints on the couplings of Delta s with meson fields. Conditions for the appearance of Delta s are studied. We demonstrate that with inclusion of the Delta s our equations of state continue to fulfill majority of known empirical constraints including the pressure-density constraint from heavy-ion collisions, the constraint on the maximum mass of the neutron stars, the direct Urea and the gravitational baryon mass ratio constraints. (C) 2017 Elsevier B.V. All rights reserved.
    Kategória publikačnej činnosti ADC
    Číslo archívnej kópie39909
    Katal.org.BB301 - Univerzitná knižnica Univerzity Mateja Bela v Banskej Bystrici
    Báza dátxpca - PUBLIKAČNÁ ČINNOSŤ
    OdkazyPERIODIKÁ-Súborný záznam periodika
    nerozpoznaný

    nerozpoznaný

  7. NázovHyperon puzzle and the RMF model with scaled hadron masses and coupling constants
    Aut.údajeE. E. Kolomeitsev, K. A. Maslov, D. N. Voskresensky
    Autor Kolomeitsev Evgeni E. 1970- (96%) UMBFP06 - Katedra fyziky
    Spoluautori Maslov K. A. (2%)
    Voskresensky Dmitri (2%)
    Zdroj.dok. Journal of Physics: Conference Series. Vol. 668 (2016), pp. 1-6. - Bristol : IOP Publishing, 2016 ; SQM 2015 medzinárodná konferencia
    Kľúč.slová stavová rovnica   relativistický model stredného poľa   neutrónové hviezdy   equation of state   relativistic mean-field models   neutron stars  
    Jazyk dok.angličtina
    KrajinaVeľká Británia
    Systematika 533
    AnotáciaThe equation of state of cold baryonic matter is studied within a relativistic mean-field model with hadron masses and coupling constants depending on a scalar field. We demonstrate that if the effective nucleon mass stops to decrease with a density increase at densities n > n > n0, where n0 is the nuclear saturation density, the equation of state stiffens for these densities and the limiting neutron star mass increases. The stabilization of the nucleon mass can be realised if in the equation of motion for the scalar mean-field there appear a term sharply varying in a narrow vicinity of the field value corresponding to the density n . We show several possible realizations of this mechanism getting sufficiently stiff equations of state. The appearance of hyperons in dense neutron star interiors is accounted for. The obtained equations of state remain sufficiently stiff if the reduction of the ϕ meson mass is incorporated. Thereby, the hyperon puzzle can be resolved
    Kategória publikačnej činnosti AFC
    Číslo archívnej kópie35029
    Katal.org.BB301 - Univerzitná knižnica Univerzity Mateja Bela v Banskej Bystrici
    Báza dátxpca - PUBLIKAČNÁ ČINNOSŤ
    OdkazyPERIODIKÁ-Súborný záznam periodika
    nerozpoznaný

    nerozpoznaný

  8. NázovRelativistic mean-field models with scaled hadron masses and couplings
    Podnázovhyperons and maximum neutron star mass
    Aut.údajeK. A. Maslov, E. E. Kolomeitsev, D. N. Voskresensky
    Autor Maslov K. A. (1%)
    Spoluautori Kolomeitsev Evgeni E. 1970- (98%) UMBFP06 - Katedra fyziky
    Voskresensky Dmitri (1%)
    Zdroj.dok. Nuclear Physics A. Vol. 950 (2016), pp. 64-109. - Amsterdam : Elsevier B.V., 2016
    Kľúč.slová stavová rovnica   equation of state   neutrónové hviezdy   neutron stars   fyzika - physics  
    Jazyk dok.angličtina
    KrajinaHolandsko
    Systematika 53
    Kategória publikačnej činnosti ADC
    Číslo archívnej kópie36997
    Katal.org.BB301 - Univerzitná knižnica Univerzity Mateja Bela v Banskej Bystrici
    Báza dátxpca - PUBLIKAČNÁ ČINNOSŤ
    OdkazyPERIODIKÁ-Súborný záznam periodika
    nerozpoznaný

    nerozpoznaný

  9. NázovSolution of the hyperon puzzle within a relativistic mean-field model
    Aut.údajeK. A. Maslov, Evgeni E. Kolomeitsev, D. N. Voskresensky
    Autor Maslov K. A. (34%)
    Spoluautori Kolomeitsev Evgeni E. 1970- (33%) UMBFP06 - Katedra fyziky
    Voskresensky Dmitri (33%)
    Zdroj.dok. Physics Letters B. Vol. 748 (2015), pp. 369-375. - Amsterdam : Elsevier B.V., 2015
    Kľúč.slová neutrónové hviezdy   neutron stars   relativistic mean-field models   hyperons  
    Jazyk dok.angličtina
    KrajinaHolandsko
    Kategória publikačnej činnosti ADC
    Číslo archívnej kópie33613
    Katal.org.BB301 - Univerzitná knižnica Univerzity Mateja Bela v Banskej Bystrici
    Báza dátxpca - PUBLIKAČNÁ ČINNOSŤ
    OdkazyPERIODIKÁ-Súborný záznam periodika
    nerozpoznaný

    nerozpoznaný

  10. NázovMaking a soft relativistic mean-field equation of state stiffer at high density
    Aut.údajeK. A. Maslov, E. E. Kolomeitsev, D. N. Voskresensky
    Autor Maslov K. A. (25%)
    Spoluautori Kolomeitsev Evgeni E. 1970- (50%) UMBFP06 - Katedra fyziky
    Voskresensky Dmitri (25%)
    Zdroj.dok. Physical Review C : Nuclear Physics. Vol. 92, no. 5 (2015), pp. [1-5]. - Maryland : American Physical Society, 2015
    Kľúč.slová neutrónové hviezdy   stavová rovnica   relativistický model stredného poľa   neutron stars   equation of state   relativistic mean-field models  
    Jazyk dok.angličtina
    KrajinaSpojené štáty
    Systematika 531
    Kategória publikačnej činnosti ADC
    Číslo archívnej kópie34334
    Katal.org.BB301 - Univerzitná knižnica Univerzity Mateja Bela v Banskej Bystrici
    Báza dátxpca - PUBLIKAČNÁ ČINNOSŤ
    OdkazyPERIODIKÁ-Súborný záznam periodika
    nerozpoznaný

    nerozpoznaný


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