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Nuclear Theory·nucl-th

Monday·August 23, 2021

3 papers—2 primary·1 cross-listed

All3Primary2Cross-lists1
  1. 01

    Energy and pairing dependence of dissipation in real-time fission dynamics

    Yu Qiang · Junchen Pei

    This work presents a microscopic study of dissipation in fission dynamical evolutions with the time-dependent Hartree-Fock+BCS method in terms of energy dependence and pairing dependence. The friction coefficients and dissipation energies are extracted by mapping the symmetric fission process of Fm into a classical equation of motion. Density-constrained calculations are used to obtain the dynamical potential. The obtained friction coefficients have a strong dependence of deformations, and averagely match the coefficients adopted in statistical models. The dissipation indeed increase with increasing initial excitation energies or with decreasing pairings. It is also shown that post-scission dissipations play a significant role. The demonstrated characteristics of dissipations will be valuable for calibrations of various fission models.

    nucl-thPRC(2021)·20 citations
  2. 02

    Neutron star deformability with hyperonization in density-dependent relativistic mean-field models

    W. Z. Shangguan🇨🇳 · Z. Q. Huang🇨🇳 · S. N. Wei🇨🇳 · W. Z. Jiang🇨🇳

    Neutron star tidal deformability extracted from gravitational wave data provides a novel probe to the interior neutron star structures and the associated nuclear equation of state (EOS). Instead of the popular composition of nucleons and leptons in neutron stars, we include hyperons and examine the role of hyperons in the tidal deformability and its impact on the symmetry energy in a relativistic mean-field approach with the density-dependent parametrizations. The hyperons are found to have significant impact on the deformability, correlated sensitively with the onset density and fraction of hyperons in neutron star matter. Moderately lower onset density of hyperons can yield considerable modification to the tidal deformability and shift its inference on the nuclear EOS. The future measurements of the tidal deformability at multi-fiducial star masses are anticipated to lift the degeneracy between the contributions from the hyperon component and symmetry energy.

    nucl-thastro-ph.HEPRD(2021)·10 citations
  3. 03

    Lattice simulations of the QCD chiral transition at real baryon density

    Szabolcs Borsanyi🇩🇪 · Zoltan Fodor🇩🇪 · Matteo Giordano🇭🇺 · Sandor D. Katz🇭🇺 · Daniel Nogradi🇭🇺 · Attila Pasztor🇭🇺 · Chik Him Wong🇩🇪

    State-of-the-art lattice QCD studies of hot and dense strongly interacting matter currently rely on extrapolation from zero or imaginary chemical potentials. The ill-posedness of numerical analytic continuation puts severe limitations on the reliability of such methods. Here we use the more direct sign reweighting method to perform lattice QCD simulation of the QCD chiral transition at finite real baryon density on phenomenologically relevant lattices. This method does not require analytic continuation and avoids the overlap problem associated with generic reweighting schemes, so has only statistical but no uncontrolled systematic uncertainties for a fixed lattice setup. This opens up a new window to study hot and dense strongly interacting matter from first principles. We perform simulations up to a baryochemical potential-temperature ratio of covering most of the RHIC Beam Energy Scan range in the chemical potential. We also clarify the connection of the approach to the more traditional phase reweighting method.

    ↳ hep-lathep-phnucl-thPRD(2022)·49 citations

Affiliations

first authorsco-authorsvia INSPIRE