PaperPanorama
FAQ

Nuclear Theory·nucl-th

Thursday·March 27, 2025

12 papers—4 primary·8 cross-listed

All12Primary4Cross-lists8
  1. 01

    Viscous Gubser flow with conserved charges to benchmark fluid simulations

    Kevin Ingles🇺🇸 · Jordi Salinas San Martín🇺🇸 · Willian Serenone🇺🇸 · Jacquelyn Noronha-Hostler🇺🇸

    We present semi-analytical solutions for the evolution of both the temperature and chemical potentials for viscous Gubser flow with conserved charges. Such a solution can be especially useful in testing numerical codes intended to simulate relativistic fluids with large chemical potentials. The freeze-out hypersurface profiles for constant energy density are calculated, along with the corresponding normal vectors and presented as a new unit test for numerical codes. We also compare the influence of the equation of state on the semi-analytical solutions. We benchmark the newly developed Smoothed Particle Hydrodynamics (SPH) code CCAKE that includes both shear viscosity and three conserved charges. The numerical solutions are in excellent agreement with the semi-analytical solution and also are able to accurately reproduce the hypersurface at freeze-out.

    nucl-thhep-thphysics.flu-dynPRC(2026)·3 citations
  2. 02

    Magnetodynamic Characteristics and QGP Energy Dissipation in RMHD Framework with Relativistic Heavy-Ion Collisions

    Huang-Jing Zheng🇨🇳 · Sheng-Qin Feng🇨🇳

    Relativistic heavy-ion collisions generate ultra-strong magnetic fields that interact with the quark-gluon plasma (QGP), a key focus of high-energy physics research.This study investigates QGP energy density evolution under time-dependent magnetic fields within a (1 +1)D relativistic magnetohydrodynamic (RMHD) framework integrated with Bjorken flow. Three magnetic field temporal evolution models (Type-1,Type-2,Type-3) are analyzed for two different equations of state: (1) , and (2) incorporating a temperature-dependent magnetic susceptibility derived from lattice QCD. Results show that stronger magnetic fields consistently suppress QGP energy density decay,with suppression magnitude dependent on the magnetic field's temporal profile. Ultra-relativistic fluids exhibit slowed energy decay due to magnetic pressure counteracting hydrodynamic expansion.In contrast,magnetized conformal fluids display faster energy dissipation under identical conditions, arising from the synergistic effect of enhanced magnetic fluid coupling,increased energy dissipation during interaction,and QGP's perfect fluid expansion at elevated temperatures.Temperature-dependent magnetic susceptibility reveals a transition from diamagnetic (confined phase) to paramagnetic (deconfined QGP phase) behavior, introducing a feedback mechanism that strengthens energy retention at higher temperatures. This work clarifies the interplay between magnetic field dynamics,QCD phase structure, and hydrodynamic expansion, providing key observational signatures for distinguishing fluid types in heavy-ion collisions and advancing realistic modeling of magnetized QGP.

    nucl-thhep-phParticles(2026)·2 citations
  3. 03

    Effects of quark core sizes of baryons in neutron star matter

    Wolfgang Bentz🇯🇵 · Ian C. Cloët🇺🇸

    We describe the quark substructure of hadrons and the equation of state of high density neutron star matter by using the NambuJona-Lasinio (NJL) model, which is an effective quark theory based on QCD. The interaction between quarks fully respects the chiral and flavor symmetries. Guided by the success of various low energy theorems, we assume that the explicit breaking of these symmetries occurs only via the current quark masses, and all other symmetry breakings are of dynamical nature. In order to take into account the effects of the finite quark core sizes of the baryons on the equation of state, we make use of an excluded volume framework which respects thermodynamic consistency. The effects generated by the swelling quark cores generally act repulsively and lead to an increase of the pressure with increasing baryon density. On the other hand, in neutron star matter they also lead to a decrease of the density window where hyperons appear, because it becomes energetically more favorable to convert the faster moving nucleons into hyperons. Our quantitative analysis shows that the net effect of the excluded volume is too small to solve the long standing "hyperon puzzle," which is posed by the large observed masses of neutron stars. Thus the puzzle persists in a relativistic effective quark theory which takes into account the short range repulsion between baryons caused by their finite and swelling quark core sizes in a phenomenological way.

    nucl-thhep-phSymmetry(2025)·6 citations
  4. 04

    High-Precision Ab Initio Radius Calculations of Boron Isotopes

    Tobias Wolfgruber · Tobias Gesser · Marco Knöll · Pieter Maris · Robert Roth

    We perform a precision study of radii in Boron isotopes for multiple realistic interactions from chiral effective field theory. We obtain predictions of radii with combined many-body and interaction uncertainty quantification from ab initio no-core shell model calculations together with machine learning extrapolation methods. An extension to radius differences further allows us to investigate a potential proton halo in B and, moreover, provide predictions that relate directly to the isotope shift, which can be precisely measured in experiments.

    nucl-thPRC(2025)·8 citations

Affiliations

first authorsco-authorsvia INSPIRE