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Nuclear Theory·nucl-th

Thursday·July 14, 2016

4 papers—2 primary·2 cross-listed

All4Primary2Cross-lists2
  1. 01

    A new relativistic hydrodynamics code for high-energy heavy-ion collisions

    Kazuhisa Okamoto🇯🇵 · Yukinao Akamatsu🇯🇵 · Chiho Nonaka🇯🇵

    We construct a new Godunov type relativistic hydrodynamics code in Milne coordinates, using a Riemann solver based on the two-shock approximation which is stable under the existence of large shock waves. We check the correctness of the numerical algorithm by comparing numerical calculations and analytical solutions in various problems, such as shock tubes, expansion of matter into the vacuum, the Landau-Khalatnikov solution, and propagation of fluctuations around Bjorken flow and Gubser flow. We investigate the energy and momentum conservation property of our code in a test problem of longitudinal hydrodynamic expansion with an initial condition for high-energy heavy-ion collisions. We also discuss numerical viscosity in the test problems of expansion of matter into the vacuum and conservation properties. Furthermore, we discuss how the numerical stability is affected by the source terms of relativistic numerical hydrodynamics in Milne coordinates.

    nucl-thhep-exhep-phEPJC(2016)·16 citations
  2. 02

    Symmetry-preserving contact interaction model for heavy-light mesons

    F. E. Serna🇧🇷 · M. A. Brito🇧🇷 · G. Krein🇧🇷

    We use a symmetry-preserving regularization method of ultraviolet divergences in a vector-vector contact interac- tion model for low-energy QCD. The contact interaction is a representation of nonperturbative kernels used Dyson-Schwinger and Bethe-Salpeter equations. The regularization method is based on a subtraction scheme that avoids standard steps in the evaluation of divergent integrals that invariably lead to symmetry violation. Aiming at the study of heavy-light mesons, we have implemented the method to the pseudoscalar pion and Kaon mesons. We have solved the Dyson-Schwinger equation for the u, d and s quark propagators, and obtained the bound-state Bethe-Salpeter amplitudes in a way that the Ward-Green-Takahashi identities reflecting global symmetries of the model are satisfied for arbitrary routing of the momenta running in loop integrals.

    nucl-thAIP Conf.Proc.(2016)·10 citations

Affiliations

first authorsco-authorsvia INSPIRE