Nuclear Theory·nucl-th

Monday·December 5, 2022

7 papers—5 primary·2 cross-listed

01
[Submitted on 1 Dec 2022]
Far-from-equilibrium slow modes and momentum anisotropy in expanding plasma
Jasmine Brewer🇨🇭 · Weiyao Ke🇺🇸 · Li Yan🇨🇳 · Yi Yin🇨🇳
The momentum distribution of particle production in heavy-ion collisions encodes information about thermalization processes in the early-stage quark-gluon plasma. We use kinetic theory to study the far-from-equilibrium evolution of an expanding plasma with an anisotropic momentum-space distribution. We identify slow and fast degrees of freedom in the far-from-equilibrium plasma from the evolution of moments of this distribution. At late times, the slow modes correspond to hydrodynamic degrees of freedom and are naturally gapped from the fast modes by the inverse of the relaxation time, $τ_{R}^{- 1}$ . At early times, however, there are an infinite number of slow modes with a gap inversely proportional to time, $τ^{- 1}$ . From the evolution of the slow modes we generalize the paradigm of the far-from-equilibrium attractor to vector and tensor components of the energy-momentum tensor, and even to higher moments of the distribution function that are not part of the hydrodynamic evolution. We predict that initial-state momentum anisotropy decays slowly in the far-from-equilibrium phase and may persist until the relaxation time.
Comments:
5 pages, 3 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2212.00820 [pdf]
PRD(2024)·14 citations
02
[Submitted on 2 Dec 2022]
Microscopic study of the deformed neutron halo of 31Ne
R.Takatsu · Y. Suzuki · W. Horiuchi · M. Kimura
The properties of the deformed halo of 31Ne were discussed using the antisymmetrized molecular dynamics plus resonating group method (AMD+RGM). The AMD+RGM calculations describe a large neutron radius for the ground state and reveal that the ground state is dominated by core-excited components. The resonant states were also investigated by applying the analytical continuation of the coupling constant. It was found that the first excited state (the 5/2- state) is also dominated by core-excited components and has a small decay width, whereas the second excited state (the 7/2- state) is dominated by the valence neutron in the $f$ -wave coupled to the ground state of 30Ne.
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
2212.00980 [pdf]
PRC(2023)·12 citations
03
[Submitted on 2 Dec 2022]
On the strong local potential limit
K. Murulane🇿🇦 · S. Karataglidis🇿🇦 · B. G. Giraud🇫🇷
Finite, bound, many-body systems, where the interaction operator, $V = \sum v_{ij}$ , is local and happens to strongly dominate the kinetic energy operator, $T = \sum t_{i}$ , display a classical limit from diagonalizing $V$ alone, hence a clear picture of interparticle correlations, such as steric blocking emerges. This limit exhibits intrinsic symmetries and also fluctuations from mass formulae. The present work investigates how such emergent symmetries and fluctuations might be extrapolated to physical situations where $T$ is reinstated.
Comments:
26 pages, 31 figures, accepted for publication in International Journal of Modern Physics E
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2212.01035 [pdf]
IJMPE(2023)·0 citations
04
[Submitted on 2 Dec 2022]
Heavy Baryons in Compact Stars
Armen Sedrakian🇩🇪 · Jia-Jie Li🇨🇳 · Fridolin Weber🇺🇸
We review the physics of hyperons and $Δ$ -resonances in dense matter in compact stars. The covariant density functional approach to the equation of state and composition of dense nuclear matter in the mean-field Hartree and Hartree-Fock approximation is presented, with regimes covering cold $β$ -equilibrated matter, hot and dense matter with and without neutrinos relevant for the description of supernovas and binary neutron star mergers, as well as dilute expanding nuclear matter in collision experiments. We discuss the static properties of compact stars with hyperons and $Δ$ -resonances in light of constraints placed in recent years by the multimessenger astrophysics of compact stars on the compact stars' masses, radii, and tidal deformabilities. The effects of kaon condensation and strong magnetic fields on the composition of hypernuclear stars are also discussed. The properties of rapidly rotating compact hypernuclear stars are discussed and confronted with the observations of 2.5-2.8 solar mass compact objects in gravitational wave events. We further discuss the cooling of hypernuclear stars, the neutrino emission reactions, hyperonic pairing, and the mass hierarchy in the cooling curves that arises due to the onset of hyperons. The effects of hyperons and $Δ$ -resonances on the equation of state of hot nuclear matter in the dense regime, relevant for the transient astrophysical event and in the dilute regime relevant to the collider physics is discussed. The review closes with a discussion of universal relations among the integral parameters of hot and cold hypernuclear stars and their implications for the analysis of binary neutron star merger events.
Comments:
v3 and v2: 79 pages, 26 figures, final version (minor changes and additions, typos corrected). v1: 76 pages, 26 figures. arXiv admin note: text overlap with arXiv:2105.14050
Subjects:
Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); Solar and Stellar Astrophysics (astro-ph.SR)
arXiv:
2212.01086 [pdf]
PPNP(2023)·106 citations
05
[Submitted on 2 Dec 2022]
Hybrid stars with large strange quark cores
Márcio Ferreira🇵🇹 · Renan Câmara Pereira🇵🇹 · Constança Providência🇵🇹
The possible existence of hybrid stars is studied using several multi-quark interaction channels. The hadronic phase consists of an equation of state (EoS) with presently accepted nuclear matter properties and the quark model is constrained by the vacuum properties of several light mesons. The dependence of several NS properties on the different quark interactions is analyzed. We show that the present constraints from neutron star observations allow for the existence of hybrid stars with large strangeness content and large quark cores.
Comments:
6 pages, 5 figures; Proceedings of the XVth Quark Confinement and the Hadron Spectrum conference, August 1st - 6th, 2022, University of Stavanger, Norway
Subjects:
Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph)
arXiv:
2212.01132 [pdf]
EPJ Web Conf.(2022)·1 citation
06
[Submitted on 1 Dec 2022] (cross-list from quant-ph)
Are the ground states of randomly interacting bosons random?
Charles White · Alexander Volya · Declan Mulhall · Vladimir Zelevinsky
Bosonic degrees of freedom and their emergence as a part of complex quantum many-body dynamics, symmetries, collective behavior, clustering and phase transitions play an important role in modern studies of quantum systems. In this work we present a systematic study of many-boson systems governed by random interactions. Our findings show that ground states of randomly interacting bosons are not random, being dominated by a few collective configurations containing condensates of clusters.
Comments:
15 pages, 14 figures
Subjects:
Quantum Physics (quant-ph); Nuclear Theory (nucl-th)
arXiv:
2212.00848 [pdf]
PRResearch(2023)·3 citations
07
[Submitted on 2 Dec 2022] (cross-list from hep-ph)
Accessing GPDs through the exclusive photoproduction of a photon-meson pair with a large invariant mass
Goran Duplančić🇫🇷 · Saad Nabeebaccus🇫🇷 · Kornelija Passek-Kumerički🇭🇷 · Bernard Pire🇭🇷 · Lech Szymanowski🇫🇷 · Samuel Wallon🇵🇱
We study the exclusive photoproduction of a photon-meson pair with a large invariant mass, working in the QCD factorisation framework. Explicitly, we consider a $ρ$ -meson or a charged $π$ in the final state. This process gives access to chiral-even GPDs as well as chiral-odd GPDs. We focus here on the chiral-even sector. The computation is performed at leading order and leading twist. We discuss the prospects of measuring them in various experiments such as JLab 12-GeV, COMPASS, future EIC and LHC (in ultraperipheral collisions). In particular, the high centre of mass energies available at collider experiments can be used to probe GPDs at small skewness $ξ$ . We also compute the polarisation asymmetries with respect to the incoming photon. The results for an alternative distribution amplitude (`holographic' form) are also compared with the predictions obtained with an asymptotic distribution amplitude.
Comments:
6 pages, 2 figures, Presented by S. Nabeebaccus at `Diffraction and Low-x 2022', Corigliano Calabro (Italy), September 24-30, 2022. arXiv admin note: substantial text overlap with arXiv:2209.05380
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2212.01034 [pdf]
Acta Phys.Polon.Supp.(2023)·5 citations

Affiliations

first authorsco-authorsvia INSPIRE

Far-from-equilibrium slow modes and momentum anisotropy in expanding plasma

Microscopic study of the deformed neutron halo of 31Ne

On the strong local potential limit

Heavy Baryons in Compact Stars

Hybrid stars with large strange quark cores

Are the ground states of randomly interacting bosons random?

Accessing GPDs through the exclusive photoproduction of a photon-meson pair with a large invariant mass

Affiliations