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Nuclear Theory·nucl-th

Tuesday·December 13, 2016

10 papers—6 primary·4 cross-listed

All10Primary6Cross-lists4
  1. 07

    Towards a theoretical description of dense QCD

    Owe Philipsen🇩🇪

    The properties of matter at finite baryon densities play an important role for the astrophysics of compact stars as well as for heavy ion collisions or the description of nuclear matter. Because of the sign problem of the quark determinant, lattice QCD cannot be simulated by standard Monte Carlo at finite baryon densities. I review alternative attempts to treat dense QCD with an effective lattice theory derived by analytic strong coupling and hopping expansions, which close to the continuum is valid for heavy quarks only, but shows all qualitative features of nuclear physics emerging from QCD. In particular, the nuclear liquid gas transition and an equation of state for baryons can be calculated directly from QCD. A second effective theory based on strong coupling methods permits studies of the phase diagram in the chiral limit on coarse lattices.

    ↳ hep-lathep-phnucl-thEPJ Web Conf.(2017)·10 citations
  2. 08

    Relation between the mass modification of the heavy-light mesons and the chiral symmetry structure in dense matter

    Masayasu Harada🇯🇵 · Yong-Liang Ma🇨🇳 · Daiki Suenaga🇯🇵 · Yusuke Takeda🇯🇵

    We point out that the study of the density dependences of the masses of heavy-light mesons give some clues to the chiral symmetry structure in nuclear matter. We include the omega meson effect as well as the sigma meson effect at mean field level on the density dependence of the masses of heavy-light mesons with chiral partner structure. It is found that the omega meson affects the masses of the heavy-light mesons and their antiparticles in the opposite way, while it affects the masses of chiral partners in the same way. This is because the omega meson is sensitive to the baryon number of the light degrees included in the heavy-light mesons. We also show that the mass difference between chiral partners is proportional to the mean field of sigma, reflecting the partial restoration of chiral symmetry in the nuclear matter. In addition to the general illustration of the density dependence of the heavy-light meson masses, we consider two concrete models for nuclear matter, the parity doublet model and skyrmion crystal model in the sense of mean field approximation.

    ↳ hep-phnucl-thPTEP(2017)·21 citations
  3. 09

    Phase Structure and Dynamics of QCD-- A Functional Perspective

    Nils Strodthoff🇺🇸

    The understanding of the phase structure and the fundamental properties of QCD matter from its microscopic description requires appropriate first-principle approaches. Here I review the progress towards a quantitative first-principle continuum approach within the framework of the Functional Renormalization group established by the fQCD collaboration. I focus on recent quantitative results for quenched QCD and Yang-Mills theory in the vacuum before addressing the calculation of dynamical quantities such as spectral functions and transport coefficients in this framework.

    ↳ hep-phhep-thnucl-thJ.Phys.Conf.Ser.(2017)·6 citations
  4. 10

    Spatial heterogeneity of W transmutation in a fusion device

    M. R. Gilbert · J.-Ch. Sublet · S. L. Dudarev

    Accurately quantifying the transmutation rate of tungsten (W) under neutron irradiation is a necessary requirement in the assessment of its performance as an armour material in a fusion power plant. The usual approach of calculating average responses, assuming large, homogenised material volumes, is insufficient to capture the full complexity of the transmutation picture in the context of a realistic fusion power plant design, particularly for rhenium (Re) production from W. Combined neutron transport and inventory simulations for representative {\it spatially heterogeneous} models of a fusion power plant show that the production rate of Re is strongly influenced by the local spatial environment. Localised variation in neutron moderation (slowing down) due to structural steel and coolant, particularly water, can dramatically increase Re production because of the huge cross sections of giant resolved resonances in the neutron-capture reaction of \(^{186}\)W at low neutron energies. Calculations using cross section data corrected for temperature (Doppler) effects suggest that temperature may have a relatively lesser influence on transmutation rates.

    ↳ physics.ins-detnucl-thNucl.Fusion(2017)·1 citation

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first authorsco-authorsvia INSPIRE