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Nuclear Theory·nucl-th

Wednesday·August 22, 2018

4 papers—3 primary·1 cross-listed

All4Primary3Cross-lists1
  1. 01

    [Submitted on 20 Aug 2018]

    Multi-phase transport model predictions of isobaric collisions with nuclear structures from density functional theory

    Hanlin Li🇨🇳 · Hao-jie Xu🇨🇳 · Jie Zhao🇺🇸 · Zi-Wei Lin🇨🇳 · Hanzhong Zhang🇨🇳 · Xiaobao Wang🇨🇳 · Caiwan Shen🇨🇳 · Fuqiang Wang🇨🇳

    Isobaric Ru+Ru and Zr+Zr collisions were performed at the Relativistic Heavy Ion Collider in 2018. Using the "a multi-phase transport" model with nuclear structures calculated by the density functional theory (DFT), we make predictions for the charged hadron multiplicity distributions and elliptic azimuthal anisotropies in these collisions. Emphases are put on the relative differences between the two collision systems that can decisively discriminate DFT nuclear distributions from the commonly used Woods-Saxon densities.

    Comments:
    7 pages, 10 figures. v2: published version
    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1808.06711 [pdf]
    PRC(2018)·55 citations
  2. 02

    [Submitted on 21 Aug 2018]

    SMASH -- A new hadronic transport approach

    Hannah Petersen🇩🇪 · Dmytro Oliinychenko🇺🇸 · Markus Mayer🇩🇪 · Jan Staudenmaier🇩🇪 · Sangwook Ryu🇩🇪

    Microscopic transport approaches are the tool to describe the non-equilibrium evolution in low energy collisions as well as in the late dilute stages of high-energy collisions. Here, a newly developed hadronic transport approach, SMASH (Simulating Many Accelerated Strongly-interacting Hadrons) is introduced. The overall bulk dynamics in low energy heavy ion collisions is shown including the excitation function of elliptic flow employing several equations of state. The implications of this new approach for dilepton production are discussed and preliminary results for afterburner calculations at the highest RHIC energy are presented and compared to previous UrQMD results. A detailed understanding of a hadron gas with vacuum properties is required to establish the baseline for the exploration of the transition to the quark-gluon plasma in heavy ion collisions at high net baryon densities.

    Comments:
    4 pages, 4 figures, accepted contribution to the proceedings of Quark Matter 2018
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    1808.06832 [pdf]
    NPA(2019)·45 citations
  3. 03

    [Submitted on 21 Aug 2018]

    Anisotropic hydrodynamics with number-conserving kernels

    D. Almaalol🇺🇸 · M. Alqahtani🇸🇦 · M. Strickland🇺🇸

    We compare anisotropic hydrodynamics (aHydro) results obtained using the relaxation-time approximation (RTA) and leading-order (LO) scalar \lambda \phi^4 collisional kernels. We extend previous work by explicitly enforcing number conservation through the incorporation of a dynamical chemical potential (fugacity) in the underlying aHydro distribution function. We focus on the case of a transversally homogenous and boost-invariant system obeying classical statistics and compare the relevant moments of the two collisional kernels. We then compare the time evolution of the aHydro microscopic parameters and components of the energy-momentum tensor. We also determine the non-equilibrium attractor using both the RTA and LO conformal \lambda \phi^4 number-conserving kernels. We find that the aHydro dynamics receives quantitatively important corrections when enforcing number conservation, however, the aHydro attractor itself is not modified substantially.

    Comments:
    20 pages, 8 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1808.07038 [pdf]
    PRC(2019)·16 citations
  4. 04

    [Submitted on 21 Aug 2018] (cross-list from astro-ph.HE)

    Relativistic parameterizations of neutron matter and implications for neutron stars

    Nadine Hornick🇩🇪 · Laura Tolos🇩🇪 · Andreas Zacchi🇩🇪 · Jan-Erik Christian🇩🇪 · Jürgen Schaffner-Bielich🇩🇪

    We construct parameter sets of the relativistic mean-field model fitted to the recent constraints on the asymmetry energy and the slope parameter for pure neutron matter. We find cases of unphysical behaviour, i.e.\ the appearance of negative pressures, for stiff parameter sets with low values of the effective mass . In some cases the equation of state of pure neutron matter turns out to be outside the allowed band given by chiral effective field theory. The mass-radius relations of neutron stars for all acceptable parameter sets shows a maximum mass in excess of being compatible with pulsar mass measurements. Given the constraints on the model in the low-density regime coming from chiral effective theory, we find that the radius of a neutron star is nearly independent on the value of . This is in contrast to some previous claims for a strong connection of the slope parameter with the radius of a neutron star. In fact, the mass-radius relation turns out to depend only on the isoscalar parameters of symmetric matter. The constraints of GW170817 on the tidal deformability and on the radius are also discussed.

    Comments:
    11 pages, 7 figures
    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
    arXiv:
    1808.06808 [pdf]
    PRC(2018)·106 citations

Affiliations

first authorsco-authorsvia INSPIRE