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Nuclear Theory·nucl-th

Thursday·July 21, 2016

9 papers—5 primary·4 cross-listed

All9Primary5Cross-lists4
  1. 06

    On light baryons and their excitations

    Gernot Eichmann🇩🇪 · Christian S. Fischer🇩🇪 · Helios Sanchis-Alepuz🇦🇹

    We study ground states and excitations of light octet and decuplet baryons within the framework of Dyson-Schwinger and Faddeev equations. We improve upon similar approaches by explicitly taking into account the momentum-dependent dynamics of the quark-gluon interaction that leads to dynamical chiral symmetry breaking. We perform calculations in both the three-body Faddeev framework and the quark-diquark approximation in order to assess the impact of the latter on the spectrum. Our results indicate that both approaches agree well with each other. The resulting spectra furthermore agree one-to-one with experiment, provided well-known deficiencies of the rainbow-ladder approximation are compensated for. We also discuss the mass evolution of the Roper and the excited Delta with varying pion mass and analyse the internal structure in terms of their partial wave decompositions.

    ↳ hep-phnucl-thPRD(2016)·88 citations
  2. 07

    On the thermodynamically consistent quasiparticle model of quark gluon plasma

    Guru Prakash Kadam🇮🇳

    We give the alternative formulation of quasiparticle model of quark gluon plasma with medium dependent dispersion relation. The model is thermodynamically consistent provided the medium dependent contribution to the energy density is taken in to account. We establish the connection of our model with other variants of quasiparticle models which are thermodynamically consistent. We test the model by comparing the equation of state with the lattice gauge theory simulations of SU(3) pure gluodynamics .

    ↳ hep-phnucl-th0 citations
  3. 08

    Landau quantization and neutron emissions by nuclei in the crust of a magnetar

    N. Chamel · Y. D. Mutafchieva · Zh. K. Stoyanov · L. M. Mihailov · R. L. Pavlov

    Magnetars are neutron stars endowed with surface magnetic fields of the order of ~G, and with presumably much stronger fields in their interior. As a result of Landau quantization of electron motion, the neutron-drip transition in the crust of a magnetar is shifted to either higher or lower densities depending on the magnetic field strength. The impact of nuclear uncertainties is explored considering the recent series of Brussels-Montreal microscopic nuclear mass models. All these models are based on the Hartree-Fock-Bogoliubov method with generalized Skyrme functionals. They differ in their predictions for the symmetry energy coefficient at saturation, and for the stiffness of the neutron-matter equation of state. For comparison, we have also considered the very accurate but more phenomenological model of Duflo and Zuker. Although the equilibrium composition of the crust of a magnetar and the onset of neutron emission are found to be model dependent, the quantum oscillations of the threshold density are essentially universal.

    ↳ astro-ph.HEnucl-thJ.Phys.Conf.Ser.(2016)·7 citations
  4. 09

    Testing Lorentz Symmetry using Chiral Perturbation Theory

    J.P. Noordmans🇵🇹

    We consider the low-energy effects of a selected set of Lorentz- and CPT-violating quark and gluon operators by deriving the corresponding chiral effective lagrangian. Using this effective lagrangian, low-energy hadronic observables can be calculated. We apply this to magnetometer experiments and derive the best bounds on some of the Lorentz-violating coefficients. We point out that progress can be made by studying the nucleon-nucleon potential, and by considering storage-ring experiments for deuterons and other light nuclei.

    ↳ hep-phnucl-th0 citations

Affiliations

first authorsco-authorsvia INSPIRE