Nuclear Theory·nucl-th

Monday·November 11, 2019

11 papers—5 primary·6 cross-listed

01
Pasta fluctuations in symmetric matter at finite temperature
Celso C. Barros Jr🇧🇷 · Debora P. Menezes🇧🇷 · Francesca Gulminelli🇫🇷
The equilibrium distributions of the different pasta geometries and their linear sizes are calculated from the mean field Gibbs energy functional in symmetric nuclear matter at finite temperature. The average sizes and shapes coincide approximately with the ones predicted by a standard pasta calculation in the coexisting phase approximation, but fluctuations are additionally calculated and seen to increase with temperature and baryonic density. The different pasta shapes are shown to coexist in a wide domain of density and temperature, in qualitative agreement with the findings of large scale molecular dynamics simulations, but with a much less expensive computational cost.
nucl-thPRC(2020)·14 citations
02
Study of Some Aspects of Astronuclear System
Shamim Haque Mondal · Mahamadun Hasan · Murshid Alam · Md. Abdul Khan
In this work we have studied the bulk properties of compact stellar object which is largely motivated by the recent work of Potekhin group who studied the structure and evolution of compact star on the basis of unified EoS of Brussels-Montreal group. Here we solved ToV equation of state numerically using three sets of parameter models to compute pressure, baryon density and bulk modulus etc over a wide range of matter density. The computed values of the observables like the stellar interior pressure, bulk modulus and baryon density have been presented as a function of mass density in the tabular form. Graphical analysis of computed observables and their comparison with reference data wherever available have been presented as representative cases.
nucl-thastro-ph.SR0 citations
03
Transport coefficients of hot and dense matter
O. Soloveva🇩🇪 · P. Moreau🇩🇪 · L. Oliva🇩🇪 · T. Song🇩🇪 · W. Cassing🇩🇪 · E. Bratkovskaya🇩🇪
We present calculations for the shear viscosity of the hot and dense quark-gluon plasma (QGP) using the partonic scattering cross sections as a function of temperature $T$ and baryon chemical potential $μ_{B}$ from the dynamical quasiparticle model (DQPM) that is matched to reproduce the equation of state of the partonic system above the deconfinement temperature $T_{c}$ from lattice QCD. To this aim we calculate the collisional widths for the partonic degrees of freedom at finite $T$ and $μ_{B}$ in the time-like sector and conclude that the quasiparticle limit holds sufficiently well. Furthermore, the ratio of shear viscosity $η$ over entropy density $s$ , i.e. $η / s$ , is evaluated using these collisional widths and are compared to lQCD calculations for $μ_{B}$ = 0 as well. We find that the ratio $η / s$ is in agreement with the results of calculations within the original DQPM on the basis of the Kubo formalism. Furthermore, there is only a very modest change of $η / s$ with the baryon chemical $μ_{B}$ as a function of the scaled temperature $T / T_{c} (μ_{B})$ .
nucl-thhep-phSpringer Proc.Phys.(2020)·4 citations
04
Pairing dynamics in low energy nuclear collisions
M. C. Barton · S. Jin · P. Magierski · K. Sekizawa · G. Wlazłowski · A. Bulgac
Superfluidity is a generic feature of various quantum systems at low temperatures and it is in particular important for the description of dynamics of low energy nuclear reactions. The time-dependent density functional theory (TDDFT) is, to date, the only microscopic method which takes into account in a consistent way far from equilibrium dynamics of pairing field and single-particle degrees of freedom. The local version of TDDFT, so called TDSLDA, is particularly useful for the description of nuclear reactions and is well suited for leadership class computers of hybrid (CPU+GPU) architecture. The preliminary results obtained for collisions involving both medium-mass and heavy nuclei at the energies around the Coulomb barrier are presented.
nucl-thActa Phys.Polon.B(2020)·3 citations
05
On introducing Charge-Symmetry-Breaking terms to nuclear Energy Density Functionals
P. Bączyk🇵🇱 · M. Konieczka🇵🇱 · K.M.L. Martinez🇦🇺 · S. Antić🇦🇺 · P.A.M Guichon🇫🇷 · W. Satuła🇵🇱 · J.R. Stone🇬🇧 · A.W. Thomas🇦🇺
The Charge-Symmetry-Breaking (CSB) character of the nucleon-nucleon interaction is well established. This work presents two different ways of introducing such effects into a nuclear Energy Density Functional (EDF). CSB terms are either coming from the effective theory expansion or are derived from electromagnetic mixing of $ρ^{0}$ and $ω$ mesons. These terms are then introduced to Skyrme and Quark-Meson-Coupling EDFs, respectively.
nucl-thActa Phys.Polon.B(2020)·0 citations

Affiliations

first authorsco-authorsvia INSPIRE

Pasta fluctuations in symmetric matter at finite temperature

Study of Some Aspects of Astronuclear System

Transport coefficients of hot and dense matter

Pairing dynamics in low energy nuclear collisions

On introducing Charge-Symmetry-Breaking terms to nuclear Energy Density Functionals

Affiliations