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Nuclear Theory·nucl-th

Friday·January 30, 2015

6 papers—2 primary·4 cross-listed

All6Primary2Cross-lists4
  1. 01

    Neutron star equations of state with optical potential constraint

    Sofija Antić🇩🇪 · Stefan Typel🇩🇪

    Nuclear matter and neutron stars are studied in the framework of an extended relativistic mean-field (RMF) model with higher-order derivative and density dependent couplings of nucleons to the meson fields. The derivative couplings lead to an energy dependence of the scalar and vector self-energies of the nucleons. It can be adjusted to be consistent with experimental results for the optical potential in nuclear matter. Several parametrisations, which give identical predictions for the saturation properties of nuclear matter, are presented for different forms of the derivative coupling functions. The stellar structure of spherical, non-rotating stars is calculated for these new equations of state (EoS). A substantial softening of the EoS and a reduction of the maximum mass of neutron stars is found if the optical potential constraint is satisfied.

    nucl-thNPA(2015)·11 citations
  2. 02

    Heavy quark diffusion in pre-equilibrium stage of heavy ion collisions

    Santosh K. Das🇮🇹 · Marco Ruggieri🇮🇹 · Surasree Mazumder🇮🇳 · Vincenzo Greco🇮🇹 · Jan-e Alam🇮🇳

    The drag and diffusion coefficients of heavy quarks (HQs) have been evaluated in the pre-equilibrium phase of the evolving fireball produced in heavy ion collisions at RHIC and LHC energies. The KLN and classical Yang-Mills spectra have been used for describing the momentum distributions of the gluons produced just after the collisions but before they thermalize. The interaction of the HQs with these gluons has been treated within the framework of perturbative QCD. We have observed that the HQs are dragged almost equally by the kinetically equilibrated and out-of-equilibrium gluonic systems. We have also noticed that the HQs diffusion in the pre-equilibrium gluonic phase is as fast as in the kinetically equilibrated gluons. Moreover, the diffusion is faster in the pre-equilibrium phase than in the chemically equilibrated quark-gluon plasma. These findings may have significant impact on the analysis of experimental results on the elliptic flow and the high momentum suppression of the open charm and beauty hadrons.

    nucl-thhep-phJ.Phys.G(2015)·34 citations

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