Nuclear Theory·nucl-th

Monday·December 18, 2023

14 papers—11 primary·3 cross-listed

01
[Submitted on 14 Dec 2023]
The effects of pseudorapidity-dependent observables on (3+1)D Bayesian Inference of relativistic heavy-ion collisions
Chun Shen🇺🇸 · Björn Schenke🇺🇸 · Wenbin Zhao🇺🇸
This proceeding highlights the effects of pseudorapidity-dependent charged hadron observables $d N^{ch} / d η$ and $v_{2}^{ch} (η)$ in Au+Au collisions at 200 GeV on constraining the initial-state nuclear stopping for the beam remnants and the effective QGP specific shear viscosity in a recent Bayesian inference analysis using an event-by-event (3+1)D hydrodynamics + hadronic transport theoretical framework.
Comments:
4 pages; 1 figure; Conference proceedings for Quark Matter 2023, Sept 2023, Houston, Texas, USA
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
arXiv:
2312.09325 [pdf]
EPJ Web Conf.(2024)·9 citations
02
[Submitted on 14 Dec 2023]
Superfluid fraction in the slab phase of the inner crust of neutron stars
Giorgio Almirante🇫🇷 · Michael Urban🇫🇷
An analysis of the slab phase as it is expected in the innermost layer of neutron-star crusts is performed within the Hartree-Fock-Bogoliubov framework. We take the periodicity of the slabs into account using Bloch boundary conditions, in order to well describe the interplay between the band structure and superfluidity. We introduce a relative flow between the slabs and the surrounding neutron gas in a time-independent way. This induces a non-trivial phase of the complex order parameter, leading to a counterflow between neutrons inside and outside the slabs. With the resulting current, we compute the actual neutron superfluid fraction. For the latter our results are slightly larger than previous ones obtained in normal band theory, suggesting that normal band theory overestimates the entrainment effect.
Comments:
14 pages, 6 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2312.09345 [pdf]
PRC(2024)·14 citations
03
[Submitted on 14 Dec 2023]
Bulk viscosity transport coefficients in neutron star mergers
Yumu Yang🇺🇸 · Mauricio Hippert🇺🇸 · Enrico Speranza🇨🇭 · Jorge Noronha🇺🇸
We compute first and second-order bulk-viscous transport properties due to weak-interaction processes in $n p e$ matter in the neutrino transparent regime. The transport coefficients characterize the out-of-beta-equilibrium pressure corrections, which depend on the weak-interaction rates and the equation of state. We calculate these coefficients for realistic equations of state and show they are sensitive to changes in the nuclear symmetry energy $J$ and its slope $L$ .
Comments:
4 pages, 3 figures. Contribution to the Quark Matter 2023 conference proceedings
Subjects:
Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph)
arXiv:
2312.09364 [pdf]
EPJ Web Conf.(2024)·3 citations
04
[Submitted on 15 Dec 2023]
QCD at finite temperature and density: Criticality
Volodymyr Vovchenko🇺🇸
We overview recent theoretical developments in the search for QCD critical point at finite temperature and density, including from lattice QCD, effective QCD theories, and proton number cumulants in heavy-ion collisions. We summarize the available constraints and predictions for the critical point location and discuss future challenges and opportunities.
Comments:
7 pages, 2 figures. Proceedings of the XXXth International Conference on Ultrarelativistic Nucleus-Nucleus Collisions (Quark Matter 2023), Houston, Texas, USA, September 3-9, 2023
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
arXiv:
2312.09528 [pdf]
EPJ Web Conf.(2024)·5 citations
05
[Submitted on 15 Dec 2023]
Structure of single $Λ$ -hypernuclei with Gogny-type $Λ$ -nucleon forces
C.V. Nithish Kumar🇮🇹 · L. M. Robledo🇪🇸 · I. Vidana🇮🇹
We study the structure of single $Λ$ -hypernuclei using the Hartree--Fock--Bogoliubov method. Finite range Gogny-type forces are used to describe the nucleon-nucleon and $Λ$ -nucleon interactions. Three different $Λ$ -nucleon Gogny forces are built. The unknown parameters of these forces are obtained by fitting the experimental binding energies of the $1 s$ $Λ$ single-particle state in various hypernuclei using the ``Simulated Annealing Method''. These forces are then used to calculate the binding energies of the other ( $1 p, 1 d, 1 f, 1 g$ ) $Λ$ single-particle states in the different hypernuclei. The predicted values are found to be in good agreement with the experimental data for the three forces constructed. In addition, we calculate also the root-mean-square radii of ground state $Λ$ orbital, as well as several global properties of the hypernuclei considered such as their ground-state Hartree--Fock--Bogoliubov energy, their pairing energy and their quadrupole moment.
Comments:
8 pages, 2 figues, 3 tables
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
2312.09648 [pdf]
EPJA(2024)·2 citations
06
[Submitted on 15 Dec 2023]
Location of the QCD critical point predicted by holographic Bayesian analysis
Mauricio Hippert🇺🇸 · Joaquin Grefa🇺🇸 · T. Andrew Manning🇺🇸 · Jorge Noronha🇺🇸 · Jacquelyn Noronha-Hostler🇺🇸 · Israel Portillo Vazquez🇺🇸 · Claudia Ratti🇺🇸 · Rômulo Rougemont🇧🇷 · Michael Trujillo🇺🇸
We present results for a Bayesian analysis of the location of the QCD critical point constrained by first-principles lattice QCD results at zero baryon density. We employ a holographic Einstein-Maxwell-dilaton model of the QCD equation of state, capable of reproducing the latest lattice QCD results at zero and finite baryon chemical potential. Our analysis is carried out for two different parametrizations of this model, resulting in confidence intervals for the critical point location that overlap at one sigma. While samples of the prior distribution may not even predict a critical point, or produce critical points spread around a large region of the phase diagram, posterior samples nearly always present a critical point at chemical potentials of $μ_{B c} \sim 550 - 630$ MeV.
Comments:
Contribution to the proceedings of Quark Matter 2023. 4 pages, 1 figure
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
arXiv:
2312.09689 [pdf]
EPJ Web Conf.(2024)·2 citations
07
[Submitted on 15 Dec 2023]
Collective Dynamics -- theoretical overview
Yuuka Kanakubo🇫🇮
I overview the recent progress of phenomenological studies exploring collective dynamics in relativistic nuclear collisions to understand various QCD properties. Originally, collectivity was interpreted as a manifestation of the hydrodynamic behaviour of the QGP as a response to the initial collision geometry. Over the past decade, however, particularly following the experimental observation of collectivity in small colliding systems, pioneering studies have demonstrated the possibility of other interpretations. In this talk, I highlight recent studies aimed at understanding various QCD properties at different collision stages through the lens of collectivity and emphasize the importance of establishing Monte Carlo event generators for relativistic nuclear collisions.
Comments:
6 pages, 1 figure. Presented at the XXXth International Conference on Ultra-relativistic Nucleus-Nucleus Collisions (Quark Matter 2023), Houston, Texas, USA
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
arXiv:
2312.09735 [pdf]
EPJ Web Conf.(2024)·0 citations
08
[Submitted on 15 Dec 2023]
Response functions and giant monopole resonances for light to medium-mass nuclei from the \textit{ab initio} symmetry-adapted no-core shell model
M. Burrows · R. B. Baker · S. Bacca · K. D. Launey · T. Dytrych · D. Langr
Using the \textit{ab initio} symmetry-adapted no-core shell model, we compute sum rules and response functions for light to medium-mass nuclei, starting from interactions that are derived in the chiral effective field theory. We investigate electromagnetic transitions of monopole, dipole and quadrupole nature for symmetric nuclei such as $^{4}$ He, $^{16}$ O, $^{20}$ Ne and $^{40}$ Ca. Furthermore, we study giant monopole resonance, which can provide information on the incompressibility of symmetric nuclear matter.
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2312.09782 [pdf]
J.Phys.G(2025)·20 citations
09
[Submitted on 15 Dec 2023]
A new causal and stable theory of viscous chiral hydrodynamics
Nick Abboud🇺🇸 · Enrico Speranza🇨🇭 · Jorge Noronha🇺🇸
We construct the general theory of first-order relativistic hydrodynamics for a fluid exhibiting a chiral anomaly, including all possible viscous terms allowed by symmetry. Using standard techniques, we compute the necessary and sufficient conditions for this theory to be relativistically causal in the nonlinear regime and for thermal equilibria to be linearly stable. This is the first theory of first-order chiral hydrodynamics suitable for numerical simulations.
Comments:
4 pages. Contribution to the Quark Matter 2023 conference proceedings
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th)
arXiv:
2312.09805 [pdf]
EPJ Web Conf.(2024)·0 citations
10
[Submitted on 15 Dec 2023]
Improved Wong and classical approximations, and reduction of fusion data
L.F. Canto · V. A. B. Zagatto · J. Lubian · R. Donangelo
We present an improved version of the Wong formula for heavy-ion fusion, where the parameters of the parabolic approximation of the Coulomb barrier are replaced by parameters of the l-dependent potential at an effective partial-wave. A pocket formula for this l-dependence is given. This version reproduces the fusion cross sections of quantum mechanical calculations very well, even when the original Wong formula is not valid. The same procedure is used to derive an improved expression for the classical fusion cross section, which is very accurate at above-barrier energies. Based on this classical expression, we propose a new method to reduce fusion data in this energy range. This method is used to perform a comparative study of complete fusion suppression in collisions of weakly bound projectiles. This study indicates that the suppression of complete fusion is essentially due to the action of nuclear breakup couplings.
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2312.09918 [pdf]
PRC(2024)·6 citations
11
[Submitted on 15 Dec 2023]
Quark matter and nuclear astrophysics: recent developments
Tyler Gorda🇩🇪
Does deconfined cold quark matter occur in nature? This is currently one of the fundamental open questions in nuclear astrophysics. In these proceedings, I review the current state-of-the-art techniques to address this question in a model-agnostic manner, by synthesizing inputs from astrophysical observations of neutron stars and their binary mergers, and first-principles calculations within nuclear and particle theory. I highlight recent improvements in perturbative calculations in asymptotically dense cold quark matter, as well as compelling evidence for a conformalizing transition within the cores of massive neutron stars.
Comments:
6 pages, 3 figures. Contribution to Quark Matter 2023
Subjects:
Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph)
arXiv:
2312.09967 [pdf]
EPJ Web Conf.(2024)·2 citations
12
[Submitted on 15 Dec 2023] (cross-list from hep-ph)
Electromagnetic probes for critical fluctuations of phase transitions in dense QCD
Toru Nishimura🇯🇵 · Masakiyo Kitazawa🇯🇵 · Teiji Kunihiro🇯🇵
We study how the dilepton production rates and electric conductivity are affected by the phase transition to color superconductivity and the QCD critical point. Effects of the soft modes associated with these phase transitions are incorporated through the photon self-energy called the Aslamazov-Larkin, Maki-Thompson, and density-of-states terms, which are responsible for the paraconductivity in metallic superconductors. We show that anomalous enhancements of the production rate in the low energy/momentum region and the conductivity occur around the respective critical points.
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2312.09483 [pdf]
EPJ Web Conf.(2024)·0 citations
13
[Submitted on 15 Dec 2023] (cross-list from hep-ph)
Study of a longitudinally expanding plasma with the 2PI effective action
François Gelis🇫🇷 · Sigtryggur Hauksson🇫🇷
A central question in heavy-ion collisions is how the initial far-from-equilibrium medium evolves and thermalizes while it undergoes a rapid longitudinal expansion. In this work we use the two-particle irreducible (2PI) effective action for the first time to consider this question, focusing on $ϕ^{4}$ scalar theory truncated at three loops. We calculate the momentum distribution of quasiparticles in the medium and show that isotropization takes place. We furthermore consider the thermal mass of quasiparticles and the importance of number-changing processes.
Comments:
4 pages, 4 figures, conference proceedings for Quark Matter 2023
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2312.09749 [pdf]
EPJ Web Conf.(2024)·2 citations
14
[Submitted on 15 Dec 2023] (cross-list from astro-ph.HE)
Causality Bounds on Dissipative General-Relativistic Magnetohydrodynamics
Ian Cordeiro🇺🇸 · Enrico Speranza🇨🇭 · Kevin Ingles🇺🇸 · Fábio S. Bemfica🇧🇷 · Jorge Noronha🇺🇸
We derive necessary and sufficient conditions under which a large class of relativistic generalizations of Braginskii's magnetohydrodynamics with shear, bulk, and heat diffusion effects is causal and strongly hyperbolic in the fully nonlinear regime in curved spacetime. We find that causality severely constrains the size of nonideal effects and the onset of kinetic instabilities. Our results are crucial for assessing the regime of validity of fluid dynamical simulations of plasmas near supermassive black holes.
Comments:
16 pages, 1 figure, includes Supplemental Material. Accepted for publication in Physical Review Letters
Subjects:
High Energy Astrophysical Phenomena (astro-ph.HE); General Relativity and Quantum Cosmology (gr-qc); Nuclear Theory (nucl-th); Plasma Physics (physics.plasm-ph)
arXiv:
2312.09970 [pdf]
PRL(2024)·25 citations

Affiliations

first authorsco-authorsvia INSPIRE