Nuclear Theory·nucl-th

Thursday·June 22, 2023

10 papers—6 primary·4 cross-listed

01
[Submitted on 19 Jun 2023]
Chiral symmetry breaking and phase diagram of dual chiral density wave in a rotating quark matter
S. M. A. Tabatabaee🇮🇷
We study the inhomogeneous phase of a two-flavor quark matter under rotation at finite temperature and density using the Nambu-Jona-Lasinio model. To do this, we consider the chiral broken phase, in particular, described by the so-called dual chiral density wave which is formed as a standing wave of simultaneous scalar and pseudoscalar condensates. The solution of the corresponding Dirac equation as well as the energy spectrum found in the mean-field approximation. We then use the thermodynamic potential calculated for this model, to study the $μ$ and $Ω$ dependence of constituent mass and the wave vector at $T = 0$ . We find there exist two islands in the $μ - Ω$ plane that the dual-chiral density wave survives. The first region lies at intermediate densities and small $Ω$ . We observe, by increasing the angular velocity of matter, dual-chiral density wave forms in regions with smaller chemical potential. On the other hand, in contrast to the former, the second region is located at the large $Ω$ and small densities. Finally, we study this phase of quark matter at finite temperature and present $T - μ$ , $T - Ω$ , and $μ - Ω$ phase portraits of a hot-rotating quark matter at finite density.
Comments:
V1: 16 pages, 7 figures, 3 tables; V2: Figure 3 added, discussion extended, references updated, typos corrected, published version
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
arXiv:
2306.11753 [pdf]
PRD(2023)·13 citations
02
[Submitted on 21 Jun 2023]
Superheavy Elements and Ultradense Matter
Evan LaForge🇺🇸 · Will Price🇺🇸 · Johann Rafelski🇺🇸
In order to characterize the mass density of superheavy elements, we solve numerically the relativistic Thomas-Fermi model of an atom. To obtain a range of mass densities for superheavy matter, this model is supplemented with an estimation of the number of electrons shared between individual atoms. Based on our computation, we expect that elements in the island of nuclear stability around $Z = 164$ will populate a mass density range of $36.0 - 68.4$ g/cm $^{3}$ . We then extend our method to the study of macroscopic alpha particle nuclear matter condensate drops.
Comments:
17 pages, 6 figures, published version
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Atomic Physics (physics.atom-ph)
arXiv:
2306.11989 [pdf]
Eur.Phys.J.Plus(2023)·1 citation
03
[Submitted on 21 Jun 2023]
Structure of Heavy Nuclei Based on Nucleon Quartets
Alejandro Restrepo-Giraldo
Several topics concerning nuclear structure and electromagnetic interactions of heavy nuclei are reviewed. These comprehend the deformed single-particle shell model, nuclear collective motion, symmetry breaking and approximate symmetry restoring in atomic nuclei, particularly the proxy-SU(3) scheme. The relations between these theoretical frameworks are stated and it is shown how they contribute to a better and broader understanding of atomic nuclei. The semi-microscopic algebraic quartet model of atomic nuclei in the proxy-SU(3) scheme is applied to obtain previously unknown irreducible representations, deformation parameters, nuclear excited states and electromagnetic transition probabilities for certain heavy isotopes. The experimental data available for such nuclear region is currently very poor, so in preparation for future experimental efforts the theoretical background is developed along with some perspectives to work on are proposed.
Comments:
Typos and misspellings corrected
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2306.11996 [pdf]
2 citations
04
[Submitted on 21 Jun 2023]
Exploring the chiral and deconfinement phase transitions in a self-consistent PNJL model
Xiaozhu Yu🇨🇳 · Liangkai Wu🇨🇳 · Lang Yu🇨🇳 · Xinyang Wang🇨🇳
In this work, we study the chiral and deconfinement phase transitions in a two-flavor Polyakov loop extended Nambu--Jona-Lasinio (PNJL) model. And note that the self-consistent mean field approximation is employed by introducing an arbitrary parameter $α$ to measure the weights of the Fierz-transformed interaction channels. By making use of this model, we systematically investigate the chiral and deconfinement phase transition lines (as well as the chiral ones in the NJL model for comparison) under different values of $α$ . It is found that, the increasing of $α$ helps to enhance the chiral (pseudo)critical temperature at fixed chemical potential, and also to enhance the chiral (pseudo)critical chemical potential at fixed temperature. And the critical end point (CEP) vanishes when $α$ becomes large enough. Besides, we find that the incorporation of Polyakov loop increases $T_{C E P}$ but does not change $μ_{C E P}$ for small values of $α$ .
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
arXiv:
2306.12036 [pdf]
EPJA(2024)·2 citations
05
[Submitted on 21 Jun 2023]
Superscaling in the resonance region for neutrino-nucleus scattering: The SuSAv2-DCC model
J. Gonzalez-Rosa · G. D. Megias · J. A. Caballero · M. B. Barbaro
In this work the SuSAv2 and dynamical coupled-channels (DCC) models have been combined and tested in the inelastic regime for electron and neutrino reactions on nuclei. The DCC model, an approach to study baryon resonances through electron and neutrino induced meson production reactions, has been implemented for the first time in the SuSAv2-inelastic model to analyze the resonance region. Within this framework, we also present a novel description about other inelasticities in the resonance region (SoftDIS). The outcomes of these approaches are firstly benchmarked against (e,e') data on 12C. The description is thus extended to the study of neutrino-nucleus inclusive cross sections on 12C and 40Ar and compared with data from the T2K, MicroBooNE, ArgoNEUT and MINERvA experiments, thus covering a wide kinematical range.
Comments:
Submitted to Physical Review D
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2306.12060 [pdf]
PRD(2023)·12 citations
06
[Submitted on 21 Jun 2023]
A Poincaré covariant cascade method for high-energy nuclear collisions
Yasushi Nara🇯🇵 · Asanosuke Jinno🇯🇵 · Tomoyuki Maruyama🇯🇵 · Koichi Murase🇯🇵 · Akira Ohnishi🇯🇵
We present a Poincaré covariant cascade algorithm based on the constrained Hamiltonian dynamics in an $8 N$ -dimensional phase space to simulate the Boltzmann-type two-body collision term. We compare this covariant cascade algorithm with traditional $6 N$ -dimensional phase-space cascade algorithms. To validate the covariant cascade algorithm, we perform box calculations. We examine the frame dependence of the algorithm in a one-dimensionally expanding system as well as the compression stages of colliding two nuclei. We confirm that our covariant cascade method is reliable to simulate high-energy nuclear collisions. Furthermore, we present Lorentz-covariant equations of motion for the $N$ -body system interacting via potentials, which can be efficiently solved numerically.
Comments:
13 pages, 10 figures, 1 table, typos fixed
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
arXiv:
2306.12131 [pdf]
PRC(2023)·11 citations
07
[Submitted on 20 Jun 2023] (cross-list from astro-ph.HE)
Superfluid Rivers in Spinning-down Neutron Stars
Yuri Levin · Bennett Link
We study the motion of neutron superfluid vortices in a spinning-down neutron star, assuming axisymmetry of the flow and ignoring motion of vortices about the rotation axis. We find that the vortex array, if initially rectilinear, is soon substantially deformed as the star spins down; vortices are swept outward by the Magnus force, accumulating in regions of the inner crust where they pin, accompanied by significant bending of the vortex array. As the star spins down to below a spin rate of ~20 Hz (twice the spin rate of the Vela pulsar), the Magnus and pinning forces gradually compress the vortex array into dense sheets that follow spherical shells. In some cases, the vortex array bends on itself and reconnects, forming one or more tori of vortex rings that contain superfluid ``rivers" with significant angular momentum. Vortex sheets are likely to form near the base of the inner crust, in the regime of nuclear pasta.
Comments:
12 pages, 2 figures, 2 animations
Subjects:
High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
arXiv:
2306.11775 [pdf]
ApJ(2023)·6 citations
08
[Submitted on 21 Jun 2023] (cross-list from quant-ph)
The Jost function and Siegert pseudostates from R-matrix calculations at complex wavenumbers
Paul Vaandrager · Jérémy Dohet-Eraly · Jean-Marc Sparenberg
The single-channel Jost function is calculated with the computational R-matrix on a Lagrange-Jacobi mesh, in order to study its behaviour at complex wavenumbers. Three potentials derived from supersymmetric transformations are used to test the accuracy of the method. Each of these potentials, with s-wave or p-wave bound, resonance or virtual states, has a simple analytical expression for the Jost function, which is compared with the calculated Jost function. Siegert states and Siegert pseudostates are determined by finding the zeros of the calculated Jost function. Poles of the exact Jost function are not present in the calculated Jost function due to the truncation of the potential in the R-matrix method. Instead, Siegert pseudostates arise in the vicinity of the missing poles.
Comments:
18 pages, 4 figures
Subjects:
Quantum Physics (quant-ph); Nuclear Theory (nucl-th)
arXiv:
2306.12216 [pdf]
EPJA(2024)·1 citation
09
[Submitted on 21 Jun 2023] (cross-list from astro-ph.HE)
What is the nature of the HESS J1731-347 compact object?
Violetta Sagun · Edoardo Giangrandi · Tim Dietrich · Oleksii Ivanytskyi · Rodrigo Negreiros · Constança Providência
Once further confirmed in future analyses, the radius and mass measurement of HESS J1731-347 with $M = 0.7 7_{- 0.17}^{+ 0.20} M_{⊙}$ and $R = 10. 4_{- 0.78}^{+ 0.86} km$ will be among the lightest and smallest compact objects ever detected. This raises many questions about its nature and opens up the window for different theories to explain such a measurement. In this article, we use the information from Doroshenko et al. (2022) on the mass, radius, and surface temperature together with the multimessenger observations of neutron stars to investigate the possibility that HESS J1731-347 is one of the lightest observed neutron star, a strange quark star, a hybrid star with an early deconfinement phase transition, or a dark matter-admixed neutron star. The nucleonic and quark matter are modeled within realistic equation of states (EOSs) with a self-consistent calculation of the pairing gaps in quark matter. By performing the joint analysis of the thermal evolution and mass-radius constraint, we find evidence that within a 1 $σ$ confidence level, HESS J1731-347 is consistent with the neutron star scenario with the soft EOS as well as with a strange and hybrid star with the early deconfinement phase transition with a strong quark pairing and neutron star admixed with dark matter.
Comments:
9 pages, 3 figures
Subjects:
High Energy Astrophysical Phenomena (astro-ph.HE); General Relativity and Quantum Cosmology (gr-qc); Nuclear Theory (nucl-th)
arXiv:
2306.12326 [pdf]
ApJ(2023)·96 citations
10
[Submitted on 21 Jun 2023] (cross-list from hep-ph)
Phase structure of the on-shell parametrized 2+1 flavor Polyakov quark-meson model
Suraj Kumar Rai🇮🇳 · Vivek Kumar Tiwari🇮🇳
Augmenting the improved chiral effective potential of the on-shell renormalized 2+1 flavour quark-meson (RQM) model with the Polyakov-loop potential that accounts for the deconfinement transition,~we get the Quantum Chromodynamics (QCD) like framework of the renormalized Polyakov quark-meson (RPQM) model.~When the divergent quark one-loop vacuum term is included in the effective potential of the quark-meson (QM) model,~its tree level parameters or the parameters fixed by the use of meson curvature masses,~become inconsistent as the curvature masses involve the self energy evaluations at zero momentum.~Using the modified minimal subtraction method,~the consistent chiral effective potential for the RQM model has been calculated after relating the counterterms in the on-shell (OS) scheme to those in the $MS$ scheme and finding the relations between the renormalized parameters of both the schemes where the physical (pole) masses of the $π, K, η$ and $η^{'}$ pseudo-scalar mesons and the scalar $σ$ meson,~the pion and kaon decay constants,~have been put into the relation of the running couplings and mass parameter.~Using the RPQM model and the PQM Model with different forms for the Polyakov-loop potentials in the presence or the absence of the quark back-reaction,~we have computed and compared the effect of the consistent quark one-loop correction and the quark back-reaction on the scaled chiral order parameter,~the QCD phase diagrams and the different thermodynamic quantities.~The results have been compared with the 2+1 flavor lattice QCD data from the Wuppertal-Budapest collaboration \{JHEP 09,73(2010); PLB 730,99(2014)\} and the HotQCD collaboration \{PRD 90,094503(2014)\}.
Comments:
28 pages, 20 Figures. arXiv admin note: text overlap with arXiv:2211.11686, arXiv:2305.16180
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2306.12382 [pdf]
PRD(2024)·10 citations

Affiliations

first authorsco-authorsvia INSPIRE