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Nuclear Theory·nucl-th

Tuesday·August 27, 2019

12 papers—6 primary·6 cross-listed

All12Primary6Cross-lists6
  1. 07

    How to Improve Functionals in Density Functional Theory? ---Formalism and Benchmark Calculation---

    Tomoya Naito · Daisuke Ohashi · Haozhao Liang

    We proposed in Ref. [arXiv:1812.09285v2] a way to improve energy density functionals in the density functional theory based on the combination of the inverse Kohn-Sham method and the density functional perturbation theory. In this proceeding, we mainly focus on the results for the and atoms.

    ↳ physics.chem-phcond-mat.str-elnucl-thphysics.atom-ph+1J.Phys.Conf.Ser.(2020)·0 citations
  2. 08

    Effect of the transfer reactions for 16O+10B elastic scattering

    N. Burtebayev · Sh. Hamada · Awad A. Ibraheem · K. Rusek · M. Wolinska-Cichocka · J. Burtebayeva · N. Amangeldi · Maulen Nassurlla · Marzhan Nassurlla · A. Sabidolda

    In this study, the angular distribution of the 16O+10B elastic scattering was measured at Elab (16O)= 24 MeV. In addition to our experimental data, this nuclear system was theoretically analyzed at different energies to study the dynamics of scattering for this system. The data were analyzed within the framework of the double-folding optical potential model.

    ↳ nucl-exnucl-thActa Physica Polonica B, No 8, Vol. 50 (2…·4 citations
  3. 09

    Continuity from neutron matter to two-flavor quark matter with and superfluidity

    Yuki Fujimoto🇯🇵 · Kenji Fukushima🇯🇵 · Wolfram Weise🇯🇵

    This study is performed with the aim of gaining insights into the possible applicability of the quark-hadron continuity concept, not only in the idealized case of three-flavor symmetric quark matter, but also for the transition from neutron matter to two-flavor quark matter. A key issue is the continuity between neutron superfluidity and a corresponding superfluid quark phase produced by -quark pairing. Symmetry arguments are developed and relevant dynamical mechanisms are analyzed. It is pointed out that the superfluidity in dense neutron matter has a direct analogue in the pairing of -quarks in two-flavor quark matter. This observation supports the idea that the quark-hadron continuity hypothesis may be valid for such systems. Possible implications for neutron stars are briefly discussed.

    ↳ hep-phnucl-thPRD(2020)·33 citations
  4. 10

    Second order causal hydrodynamics in Eckart frame: using gradient expansion scheme

    Sayantani Lahiri🇩🇪

    In the present work, we develop a causal theory of relativistic non-ideal fluids up to the second order in the Eckart frame using gradient expansion scheme. Keeping the spirit of Mueller-Israel-Stewart formalism, the general forms of bulk viscosity, shear viscosity tensor and the heat flow vector are presented. Since each of the flux quantities explicitly carry curvature terms, we show that our formalism finds application in astrophysics in particular in the strong gravity regime. We elucidate two such applications namely in viscous thick accretion disks also known as Polish doughnuts and in addressing non-rotating equilibrium configuration, like neutron stars.

    ↳ gr-qchep-thnucl-thClass.Quant.Grav.(2020)·12 citations
  5. 11

    Impact of the Nuclear Equation of State on the Stability of Hybrid Neutron Stars

    Mateusz Cierniak🇵🇱 · Tobias Fischer🇵🇱 · Niels-Uwe Bastian🇵🇱 · Thomas Klaehn🇺🇸 · Marc Salinas🇺🇸

    We construct a set of equations of state (EoS) of dense and hot matter with a 1st order phase transition from a hadronic system to a deconfined quark matter state. In this two-phase approach, hadrons are described using the relativistic mean field theory with different parametrisations and the deconfined quark phase is modeled using vBag, a bag-type model extended to include vector interactions as well as a simultaneous onset of chiral symmetry restoration and deconfinement. This feature results in a non-trivial connection between the hadron and quark EoS, modifying the quark phase beyond its onset density. We find that this unique property has an impact on the predicted hybrid (quark core) neutron star mass--radius relations.

    ↳ astro-ph.HEnucl-thUniverse(2019)·13 citations
  6. 12

    Meson Screening Masses in (2+1)-Flavor QCD

    Alexei Bazavov🇺🇸 · Simon Dentinger🇩🇪 · Heng-Tong Ding🇨🇳 · Prasad Hegde🇮🇳 · Olaf Kaczmarek🇩🇪 · Frithjof Karsch🇩🇪 · Edwin Laermann🇩🇪 · Anirban Lahiri🇩🇪 · Swagato Mukherjee🇺🇸 · Hiroshi Ohno🇯🇵 · Peter Petreczky🇺🇸 · Rishabh Thakkar🇮🇳 and 4 other authors

    We present lattice QCD results for mesonic screening masses in the temperature range 140 MeV 2500 MeV. Our calculations were carried out using (2+1)-flavors of the Highly Improved Staggered Quark (HISQ) action, with a physical value for the strange quark mass and two values of the light quark mass corresponding to pion masses of 160 MeV and 140 MeV. Continuum-extrapolated results were obtained using calculations with a variety of lattice spacings corresponding to temporal lattice extents . We discuss the implications of these results for the effective restoration of various symmetries in the high temperature phase of QCD, as well as the approach toward the perturbative limit.

    ↳ hep-lathep-phnucl-thPRD(2019)·149 citations

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first authorsco-authorsvia INSPIRE