Nuclear Theory·nucl-th

Friday·May 17, 2024

12 papers—9 primary·3 cross-listed

01
[Submitted on 15 May 2024]
BSQ Conserved Charges in Relativistic Viscous Hydrodynamics solved with Smoothed Particle Hydrodynamics
Christopher Plumberg🇺🇸 · Dekrayat Almaalol🇺🇸 · Travis Dore🇺🇸 · Débora Mroczek🇺🇸 · Jordi Salinas San Martín🇺🇸 · Willian M. Serenone🇺🇸 · Lydia Spychalla🇺🇸 · Patrick Carzon🇺🇸 · Matthew D. Sievert🇺🇸 · Fernando G. Gardim🇺🇸 · Jacquelyn Noronha-Hostler🇺🇸
Conservation laws play a crucial role in the modeling of heavy-ion collisions, including the those for charges such as baryon number (B), strangeness (S), and electric charge (Q). In this study, we present a new 2+1 relativistic viscous hydrodynamic code called CCAKE which uses the Smoothed Particle Hydrodynamics (SPH) formalism to locally conserve BSQ charges, together with an extended description of the multi-dimensional equation of state (EoS) obtained from lattice Quantum Chromodynamics. Initial conditions for CCAKE are supplied by the ICCING model, which samples gluon splittings into quark anti-quark pairs to generate the initial BSQ charge distributions. We study correlations between the BSQ charges and find that local BSQ fluctuations remain finite during the evolution, with corresponding chemical potentials of ( $\sim 100$ -- $200 MeV$ ) at freeze-out. We find that our framework produces reasonable multiplicities of identified particles and that ICCING has no significant effect on the collective flow of all charged particles nor of identified particles when only one particle of interest is considered. However, we show specifically for Pb+Pb collisions at the LHC $s_{N N} = 5.02$ TeV that ICCING does have an effect on collective flow of identified particles if two particles of interest are considered.
Comments:
51 pages, 28 Figures
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
arXiv:
2405.09648 [pdf]
PRC(2025)·28 citations
02
[Submitted on 15 May 2024]
Spin polarization in heavy-ion collisions induced by thermal vorticity and thermal shear
M. Buzzegoli🇺🇸
The vorticity is a quantity defined in a relativistic fluid that describes how much a fluid element is rotating and accelerating. By measuring the spin polarization of hadrons, it was found that the quark gluon plasma produced in heavy-ion collisions is the most "vorticous" fluid ever observed. More generally, this opens the possibility to study the physics of QCD matter using spin. Here I use statistical quantum field theory applied to a fluid in local thermodynamic equilibrium to show how to connect the average spin of a fermion with hydrodynamic quantities, and in particular with the thermal vorticity and the thermal shear. I show that the spin polarization of a Dirac particle induced by thermal vorticity is related to the gravitational (in medium) form factor related to spin-rotation coupling. For these reasons, as we are understanding the role of spin in hydrodynamics and in heavy-ion collisions, spin is becoming a promising tool to investigate the properties of QCD and whose applications are just begun to be explored.
Comments:
9 pages, SPIN2023 conference proceedings
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2405.09709 [pdf]
PoS(2024)·2 citations
03
[Submitted on 16 May 2024]
Direct ab initio calculation of the $^{4}$ He nuclear electric dipole polarizability
Peng Yin · Andrey M. Shirokov · Pieter Maris · Patrick J. Fasano · Mark A. Caprio · He Li · Wei Zuo · James P. Vary
The calculation of nuclear electromagnetic sum rules by directly diagonalizing the nuclear Hamiltonian in a large basis is numerically challenging and has not been performed for $A > 2$ nuclei. With the significant progress of high performance computing, we show that calculating sum rules using numerous discretized continuum states obtained by directly diagonalizing the ab initio no-core shell model Hamiltonian is achievable numerically. Specifically, we calculate the $^{4}$ He electric dipole ( $E 1$ ) polarizability, that is an inverse energy weighted sum rule, employing the Daejeon16 $N N$ interaction. We demonstrate that the calculations are numerically tractable as the dimension of the basis increases and are convergent. Our results for the $^{4}$ He electric dipole polarizability are consistent with the most recent experimental data and are compared with those of other theoretical studies employing different techniques and various interactions.
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2405.09799 [pdf]
PLB(2024)·6 citations
04
[Submitted on 16 May 2024]
Three-body forces and Efimov physics in nuclei and atoms
Shimpei Endo🇯🇵 · Evgeny Epelbaum🇩🇪 · Pascal Naidon🇯🇵 · Yusuke Nishida🇯🇵 · Kimiko Sekiguchi🇯🇵 · Yoshiro Takahashi🇯🇵
This review article presents historical developments and recent advances in our understanding on the three-body forces and Efimov physics, from an interdisciplinary viewpoint encompassing nuclear physics and cold atoms. Theoretical attempts to elucidate the three-body force with the chiral effective field theory are explained, followed by an overview of experiments aimed at observing signatures of the nuclear three-body force. Some recent experimental and theoretical works in the field of cold atoms devoted to measuring and engineering three-body forces among atoms are also presented. As a phenomenon arising from the three-body effect, Efimov physics in both cold atoms and nuclear systems is reviewed.
Comments:
28 pages, 11 figures
Subjects:
Nuclear Theory (nucl-th); Quantum Gases (cond-mat.quant-gas); Nuclear Experiment (nucl-ex)
arXiv:
2405.09807 [pdf]
EPJA(2025)·21 citations
05
[Submitted on 16 May 2024]
Flow and Equation of State of nuclear matter at $E_{kin}$ /A=0.25-1.5 GeV with the SMASH transport approach
Lucia Anna Tarasovičová🇸🇰 · Justin Mohs🇩🇪 · Anton Andronic🇩🇪 · Hannah Elfner🇩🇪 · Karl-Heinz Kampert🇩🇪
We present a comparison of directed and elliptic flow data by the FOPI collaboration in Au--Au, Xe--CsI, and Ni--Ni collisions at beam kinetic energies from 0.25 to 1.5 GeV per nucleon to simulations using the SMASH hadronic transport model. The Equation of State is parameterized as a function of nuclear density and momentum dependent potentials are newly introduced in SMASH. With a statistical analysis, we show that within the present status of the SMASH transport model, the collective flow data at lower energies is in the best agreement with a soft momentum dependent potential, while the elliptic flow at higher energies requires a harder momentum dependent Equation of State.
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2405.09889 [pdf]
EPJA(2024)·18 citations
06
[Submitted on 16 May 2024]
A study of the fine-structure constant dependence of radiative capture in Halo-EFT
Ulf-G. Meißner🇩🇪 · Bernard Ch. Metsch🇩🇪 · Helen Meyer🇩🇪
We study the fine-structure constant dependence of the rates of some selected radiative capture reactions within the framework of so-called Halo Effective Field Theory in order to assess the adequacy of some assumptions made on the Coulomb penetrability. We find that this dependence deviates from that implied by a parameterization of the cross sections of this effect via a simple penetration factor. Some features of this fine-structure dependence are discussed, in particular its potential impact on the abundances of the light elements in primordial nucleosynthesis.
Comments:
17 pages, 14 figures, references updated
Subjects:
Nuclear Theory (nucl-th); Cosmology and Nongalactic Astrophysics (astro-ph.CO); High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Experiment (nucl-ex)
arXiv:
2405.09971 [pdf]
EPJA(2024)·2 citations
07
[Submitted on 16 May 2024]
Formation of superconducting pair correlations in spherical even-even nuclei
V. A. Kuz'min · T. V. Tetereva
The appearance of like nucleon pair correlations in the ground state of spherical even-even nuclei is considered within a special Bogoliubov transformation. It is confirmed that in closed subshell nuclei superconducting pair correlations start to form if the coupling constant $G$ exceeds a certain threshold value. Rough upper and lower estimates are obtained for the threshold value. It is shown, that superconducting correlations exist in open subshell nuclei at any positive $G$ . In this case, nucleon pairs are distributed over all subshells participating in the pairing interaction.
Comments:
17 pages; JINR preprint E4-2024-13; submitted to PEPAN Letters (in Russian)
Subjects:
Nuclear Theory (nucl-th); Superconductivity (cond-mat.supr-con)
arXiv:
2405.10090 [pdf]
Phys.Part.Nucl.Lett.(2024)·0 citations
08
[Submitted on 16 May 2024]
Quantum Complexity Fluctuations from Nuclear and Hypernuclear Forces
Caroline E. P. Robin🇩🇪 · Martin J. Savage🇺🇸
Toward an improved understanding of the role of quantum information in nuclei and exotic matter, we examine the quantum magic (non-stabilizerness) in low-energy strong interaction processes. As stabilizer states can be prepared efficiently using classical computers, and include classes of entangled states, it is quantum magic and fluctuations in quantum magic, together with entanglement, that determine computational resource requirements. As a measure of fluctuations in quantum magic, and hence the severity of the exponentially-scaling classical computing resource requirements, induced by scattering, the "magic power" of the S-matrix is introduced. This provides indirect experimental constraints on quantum resources required to model nuclei and dense matter using fault-tolerant quantum computers. Using experimentally-determined scattering phase shifts and mixing parameters, the magic power in nucleon-nucleon and hyperon-nucleon scattering, along with the magic in the deuteron, are found to exhibit interesting and distinct features. The $Σ^{-}$ -baryon is identified as a potential candidate catalyst for enhanced spreading of magic and entanglement in dense matter, depending on in-medium decoherence.
Comments:
15 pages, 6 figures. v2: additional references, modifications to uncertainty bands; v3: version accepted for publication
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Quantum Physics (quant-ph)
arXiv:
2405.10268 [pdf]
PRC(2025)·50 citations
09
[Submitted on 16 May 2024]
Locating the critical point for the hadron to quark-gluon plasma phase transition from finite-size scaling of proton cumulants in heavy-ion collisions
Agnieszka Sorensen🇺🇸 · Paul Sorensen🇺🇸
We perform a finite-size scaling analysis of net-proton number cumulants in Au+Au collisions at center-of-mass energies between $s_{NN} = 2.4$ GeV and 54.4 GeV to search for evidence of a critical point in the QCD phase diagram. In our analysis, we use both susceptibility and Binder cumulants which we extract from the second and fourth moments of the net-proton number distributions. We take measurements in different rapidity bin widths, corresponding to different subvolumes of the system, as probes of different length scales. We use model simulations to verify the applicability of this approach, then apply it to data and find evidence for a critical point near the baryon chemical potential of $μ_{B} \approx 625$ MeV and temperature of $T \approx 140$ MeV. The Binder cumulants, also analyzed in varying rapidity bin widths, provide complementary evidence for a critical point in a similar region. This is the first analysis of experimental data to locate the critical point in a range consistent with theoretical predictions.
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
2405.10278 [pdf]
37 citations

Affiliations

first authorsco-authorsvia INSPIRE