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Nuclear Theory·nucl-th

Thursday·January 26, 2023

6 papers—2 primary·4 cross-listed

All6Primary2Cross-lists4
  1. 01

    [Submitted on 25 Jan 2023]

    Momentum dependent flow correlations in deformed nuclei at collision energies available at the BNL Relativistic Heavy Ion Collider

    Rupam Samanta🇵🇱 · Piotr Bozek🇵🇱

    Flow fluctuations in ultra-relativistic heavy-ion collision can be probed by studying the momentum dependent correlations or the factorization-breaking coefficients between flow harmonics in separate kinematic bins (transverse momentum or pseudorapidity). We study such factorization-breaking coefficients for collisions of deformed U+U nuclei to see the effect of the nuclear deformation on momentum dependent coefficients. We also study momentum dependent mixed-flow correlations for the isobar collision system : Ru+Ru and Zr+Zr, which have the same mass number but different nuclear structure, thus providing the ideal scenario to study nuclear deformation effect on such observables. We use the TRENTO + MUSIC model for simulations and event-by-event analysis of those observables. We find that these momentum dependent correlation coefficients are not only excellent candidates to probe the fluctuation in heavy-ion collision, but also show significant sensitivity to the nuclear deformation.

    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    2301.10659 [pdf]
    PRC(2023)·16 citations
  2. 02

    [Submitted on 25 Jan 2023]

    Hybrid star phenomenology from the properties of the special point

    Christoph Gärtlein🇵🇹 · Oleksii Ivanytskyi🇵🇱 · Violetta Sagun🇵🇹 · David Blaschke🇵🇱

    We study the properties of hybrid stars containing a color superconducting quark matter phase in their cores, which is described by the chirally symmetric formulation of the confining relativistic density functional approach. It is shown that depending on the dimensionless vector and diquark couplings of quark matter, the characteristics of the deconfinement phase transition are varied, allowing us to study the relation between those characteristics and mass-radius relations of hybrid stars. Moreover, we show that the quark matter equation of state (EoS) can be nicely fitted by the Alford-Braby-Paris-Reddy model that gives a simple functional dependence between the most important parameters of the EoS and microscopic parameters of the initial Lagrangian. Based on it, we analyze the special points of the mass-radius diagram in which several mass-radius curves intersect. Using the found empirical relation between the mass of the special point, the maximum mass of the mass-radius curve, and the onset mass of quark deconfinement, we constrain the range of values of the vector and diquark couplings of the quark matter model. With this constraint, we construct a family of mass-radius curves, which allow us to describe the black widow pulsar PSR J0952-0607 with a mass of as a hybrid star with a color superconducting quark matter core.

    Comments:
    13 pages, 8 figures, 4 tables, accepted for publication in Physical Review D
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2301.10765 [pdf]
    PRD(2023)·26 citations
  3. 03

    [Submitted on 25 Jan 2023] (cross-list from hep-lat)

    Precision Control in Lattice Calculation of -dependent Pion Distribution Amplitude

    Jack Holligan🇺🇸 · Xiangdong Ji🇺🇸 · Huey-Wen Lin🇺🇸 · Yushan Su🇺🇸 · Rui Zhang🇺🇸

    We present a new Bjorken -dependence analysis of a previous lattice quantum chromodynamics data for the pion distribution amplitude from MILC configurations with three lattice spacing ~fm. A leading renormalon resummation in renormalization as well as the perturbative matching kernel in the framework of large momentum expansion generates the power accuracy of the matching to the light-cone amplitude. Meanwhile, a small momentum log resummation is implemented for both the quark momentum and the antiquark momentum inside a meson of boost momentum up to 1.72 GeV along the direction, allowing us to have more accurate determination of the -dependence in the middle range. Finally, we use the complementarity between the short-distance factorization and the large momentum expansion to constrain the endpoint regions , thus obtaining the full-range -dependence of the amplitude.

    Comments:
    Update to the published version in NPB
    Subjects:
    High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2301.10372 [pdf]
    NPB(2023)·48 citations
  4. 04

    [Submitted on 25 Jan 2023] (cross-list from hep-ph)

    Deep learning predicted elliptic flow of identified particles in heavy-ion collisions at the RHIC and LHC energies

    Neelkamal Mallick🇮🇳 · Suraj Prasad🇮🇳 · Aditya Nath Mishra🇮🇳 · Raghunath Sahoo🇮🇳 · Gergely Gábor Barnaföldi🇭🇺

    Recent developments on a deep learning feed-forward network for estimating elliptic flow () coefficients in heavy-ion collisions have shown us the prediction power of this technique. The success of the model is mainly the estimation of from final state particle kinematic information and learning the centrality and the transverse momentum () dependence of . The deep learning model is trained with Pb-Pb collisions at TeV minimum bias events simulated with a multiphase transport model (AMPT). We extend this work to estimate for light-flavor identified particles such as , , and in heavy-ion collisions at RHIC and LHC energies. The number of constituent quark (NCQ) scaling is also shown. The evolution of -crossing point of , depicting a change in meson-baryon elliptic flow at intermediate-, is studied for various collision systems and energies. The model is further evaluated by training it for different regions. These results are compared with the available experimental data wherever possible.

    Comments:
    Same as the published version
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2301.10426 [pdf]
    PRD(2023)·23 citations
  5. 05

    [Submitted on 25 Jan 2023] (cross-list from cond-mat.quant-gas)

    Emergence of a Bose polaron in a small ring threaded by the Aharonov-Bohm flux

    Fabian Brauneis · Areg Ghazaryan · Hans-Werner Hammer · Artem G. Volosniev

    The model of a ring threaded by the Aharonov-Bohm flux underlies our understanding of a coupling between gauge potentials and matter. The typical formulation of the model is based upon a single particle picture, and should be extended when interactions with other particles become relevant. Here, we illustrate such an extension for a particle in an Aharonov-Bohm ring subject to interactions with a weakly interacting Bose gas. We show that the ground state of the system can be described using the Bose polaron concept -- a particle dressed by interactions with a bosonic environment. We connect the energy spectrum to the effective mass of the polaron, and demonstrate how to change currents in the system by tuning boson-particle interactions. Our results suggest the Aharonov-Bohm ring as a platform for studying coherence and few- to many-body crossover of quasi-particles that arise from an impurity immersed in a medium.

    Subjects:
    Quantum Gases (cond-mat.quant-gas); Mesoscale and Nanoscale Physics (cond-mat.mes-hall); Nuclear Theory (nucl-th)
    arXiv:
    2301.10488 [pdf]
    Commun.Phys.(2023)·5 citations
  6. 06

    [Submitted on 25 Jan 2023] (cross-list from hep-ph)

    Causality violation and the speed of sound of hot and dense quark matter in the Nambu--Jona-Lasinio model

    Arthur E. B. Pasqualotto🇧🇷 · Ricardo L. S. Farias🇧🇷 · William R. Tavares🇧🇷 · Sidney S. Avancini🇧🇷 · Gastão Krein🇧🇷

    The Nambu--Jona-Lasinio model is widely used to study strong-interaction phenomena in vacuum and quark matter. Since the model is nonrenormalizable, one needs to work within a specific regularization scheme to obtain finite results. Here we show that a commonly used cutoff regularization scheme leads to unphysical results, such as superluminal speed of sound and wrong high-temperature behavior of the specific heat and other thermodynamical quantities. Such a troublesome feature of the cutoff regularization invalidates the model for temperature and baryon density values relevant to the phenomenology of heavy-ion collisions and compact stars. We show that the source of the problems stems from cutting off momentum modes in finite integrals depending on thermal distribution functions in the grand canonical potential. The problems go away when taking into account the full momentum range of those integrals. Explicit examples are worked out in the SU(2)-flavor version of the model.

    Comments:
    Typos corrected, comments added. Matches published version
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    2301.10721 [pdf]
    PRD(2023)·23 citations

Affiliations

first authorsco-authorsvia INSPIRE