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Nuclear Theory·nucl-th

Friday·December 8, 2017

10 papers—5 primary·5 cross-listed

All10Primary5Cross-lists5
  1. 06

    [Submitted on 12 Jun 2017] (cross-list from gr-qc)

    Stellar equilibrium configurations of white dwarfs in the gravity

    G. A. Carvalho · R. V. Lobato · P. H. R. S. Moraes · José D. V. Arbañil · R. M. Marinho Jr · E. Otoniel · M. Malheiro

    In this work we investigate the equilibrium configurations of white dwarfs in a modified gravity theory, na\-mely, gravity, for which and stand for the Ricci scalar and trace of the energy-momentum tensor, respectively. Considering the functional form , with being a constant, we obtain the hydrostatic equilibrium equation for the theory. Some physical properties of white dwarfs, such as: mass, radius, pressure and energy density, as well as their dependence on the parameter are derived. More massive and larger white dwarfs are found for negative values of when it decreases. The equilibrium configurations predict a maximum mass limit for white dwarfs slightly above the Chandrasekhar limit, with larger radii and lower central densities when compared to standard gravity outcomes. The most important effect of theory for massive white dwarfs is the increase of the radius in comparison with GR and also results. By comparing our results with some observational data of massive white dwarfs we also find a lower limit for , namely, .

    Comments:
    To be published in EPJC
    Subjects:
    General Relativity and Quantum Cosmology (gr-qc); Solar and Stellar Astrophysics (astro-ph.SR); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    1706.03596 [pdf]
    EPJC(2017)·126 citations
  2. 07

    [Submitted on 7 Dec 2017] (cross-list from physics.acc-ph)

    Towards the full realization of the RIBLL2 beam line at the HIRFL-CSR complex

    Bao-Hua Sun🇨🇳 · Jian-Wei Zhao🇨🇳 · Xue-Heng Zhang🇨🇳 · Li-Na Sheng🇨🇳 · Zhi-Yu Sun🇨🇳 · Isao Tanihata🇨🇳 · Satoru Terashima🇨🇳 · Yong Zheng🇨🇳 · Li-Hua Zhu🇨🇳 · Li-Min Duan🇨🇳 · Liu-Chun He🇨🇳 · Rong-Jiang Hu🇨🇳 and 22 other authors

    The RIBLL2 in-flight separator at IMP, the secondary beam line between two storage rings at the \blue{\uwave{Heavy Ion Research Facility in Lanzhou (HIRFL-CSR)}}, has been commissioned to study the rare-isotope beam (RIB) physics at around 300 MeV/nucleon for the first time, in combination of the external target facility (ETF). The unambiguous particle identification in mass and charge states for O and Ar fragments has been achieved in recent experiments. A full realization of RIBLL2 will open many potentials to address important RIB physics problems at around 300 MeV/nucleon.

    Comments:
    3 pages, 2 figures
    Subjects:
    Accelerator Physics (physics.acc-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1712.02602 [pdf]
    Sci.Bull.(2018)·38 citations
  3. 08

    [Submitted on 7 Dec 2017] (cross-list from hep-ph)

    Wounded quark emission function at the top RHIC energy

    Michał Barej🇵🇱 · Adam Bzdak🇵🇱 · Paweł Gutowski🇵🇱

    The wounded nucleon and quark emission functions are extracted for different centralities in d+Au collisions at using Monte Carlo simulations and experimental data. The shape of the emission function depends on centrality in the wounded nucleon model, whereas it is practically universal (within uncertainties) in the wounded quark model. Predictions for distributions in p+Au and He+Au collisions are presented.

    Comments:
    9 pages, 5 figures; requested predictions for p+Al, p+Au, d+Au and 3He+Au added in Appendix A
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1712.02618 [pdf]
    PRC(2018)·19 citations
  4. 09

    [Submitted on 7 Dec 2017] (cross-list from hep-ph)

    Effect of an anisotropic escape mechanism on elliptic flow in relativistic heavy-ion collisions

    Amaresh Jaiswal🇮🇳 · Partha Pratim Bhaduri🇮🇳

    We study the effect of anisotropic escape mechanism on elliptic flow in relativistic heavy-ion collisions. We use Glauber model to generate initial conditions and ignore hydrodynamic expansion in the transverse direction. We employ Beer-Lambert law to allow for the transmittance of produced hadrons in the medium and calculate the anisotropy generated due to the suppression of particles traversing through the medium. In order to separate non-flow contribution due to surface bias effects, we ignore hydrodynamic expansion in the transverse direction and consider purely longitudinal boost-invariant expansion. We calculate the transverse momentum dependence of elliptic flow, generated from anisotropic escape mechanism due to surface bias effects, for various centralities in GeV AuAu collisions at RHIC and TeV PbPb collisions at LHC. We find that the surface bias effects have a sizable contribution to the total elliptic flow observed in heavy-ion collisions indicating that the viscosity of the QCD matter extracted from hydrodynamic simulations may be underestimated.

    Comments:
    6 pages, 2 figures, published version
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1712.02707 [pdf]
    PRC(2018)·7 citations
  5. 10

    [Submitted on 7 Dec 2017] (cross-list from hep-th)

    Resurgence and Hydrodynamic Attractors in Gauss-Bonnet Holography

    Jorge Casalderrey-Solana🇬🇧 · Nikola I. Gushterov🇬🇧 · Ben Meiring🇬🇧

    We study the convergence of the hydrodynamic series in the gravity dual of Gauss-Bonnet gravity in five dimensions with negative cosmological constant via holography. By imposing boost invariance symmetry, we find a solution to the Gauss-Bonnet equation of motion in inverse powers of the proper time, from which we can extract high order corrections to Bjorken flow for different values of the Gauss-Bonnet parameter . As in all other known examples the gradient expansion is, at most, an asymptotic series which can be understood through applying the techniques of Borel-Padé summation. As expected from the behaviour of the quasi-normal modes in the theory, we observe that the singularities in the Borel plane of this series show qualitative features that interpolate between the infinitely strong coupling limit of Super Yang Mills theory and the expectation from kinetic theory. We further perform the Borel resummation to constrain the behaviour of hydrodynamic attractors beyond leading order in the hydrodynamic expansion. We find that for all values of considered, the convergence of different initial conditions to the resummation and its hydrodynamization occur at large and comparable values of the pressure anisotropy.

    Comments:
    34 pages, 21 figures. Coefficients for the gradient expansion of the energy density provided
    Subjects:
    High Energy Physics — Theory (hep-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1712.02772 [pdf]
    JHEP(2018)·62 citations

Affiliations

first authorsco-authorsvia INSPIRE