PaperPanorama
FAQ

Nuclear Theory·nucl-th

Wednesday·December 11, 2024

12 papers—3 primary·9 cross-listed

All12Primary3Cross-lists9
  1. 01

    [Submitted on 10 Dec 2024]

    Exploring and triton correlation functions in heavy-ion collisions

    Faisal Etminan🇮🇷

    The and triton(t) momentum correlation functions, to be measured in high-energy heavy-ion collisions, are explored. Mainly, STAR detector acquired data provides an opportunity to explore the correlation function. The correlation functions are calculated using an isle-type and spin-averaged potential, also, its sensitivity to changes in potential strength has also been investigated. % Besides, even though there is no experimental data on the triton interaction yet, I constructed potentials based on the first principles HAL QCD and Nijmegen extended soft-core (ESC08c) model of spin- and isospin averaged interactions in single-folding potentials (SFP) approach. Then, the correlation functions are calculated for these two modern potentials as well as for Nijmegen hard-core model D (NHC-D) potential. The numerical results predict that, with good measurement resolution, it might be possible to recognize different potentials with a correlation function at relatively small source sizes, i.e., fm.

    Comments:
    17 pages, 6 figures, 2 Table
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex)
    arXiv:
    2412.07295 [pdf]
    J.Phys.G(2025)·3 citations
  2. 02

    [Submitted on 10 Dec 2024]

    Gravity Wave Phase Shift in a Cold Quark Star with a Nonconvex QCD BZT Shock Wave Van Der Waals Equation of State

    Keith Andrew🇺🇸 · Eric Steinfelds🇺🇸 · Kristopher Andrew🇺🇸

    We investigate BZT shocks and the QCD phase transition in the dense core of a cold quark star in beta equilibrium subject to the multicomponent van der Waals (MvdW) equation of state (EoS) as a model of internal structure. When this system is expressed in terms of multiple components, it can be used to explore the impact of a phase transition from a hadronic state to a quark plasma state with a complex clustering structure. The clustering can take the form of colored diquarks or triquarks and bound colorless meson, baryon, or hyperon states at the phase transition boundary. The resulting multicomponent EoS system is nonconvex, which can give rise to Bethe-Zel'dovich-Thompson (BZT) phase changing shock waves. Using the BZT shock wave condition we find constraints on the quark density and examine how this changes the tidal deformability of the compact core. These results are then combined with the TOV equations to find the resulting mass and radius relationship. These state are compared to recent astrophysical high-mass neutron star systems, which may provide evidence for a core that has undergone a quark gluon phase transition such as PSR 0943+10 or GW 190814.

    Comments:
    30 pages, 8 figures, 2 tables, updated parameter range and comparison models
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE)
    arXiv:
    2412.07601 [pdf]
    Astronomy(2025)·1 citation
  3. 03

    [Submitted on 10 Dec 2024]

    Fastest spinning millisecond pulsars: indicators for quark matter in neutron stars?

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

    We study rotating hybrid stars, with a particular emphasis on the effect of a deconfinement phase transition on their properties at high spin. Our analysis is based on a hybrid equation of state (EoS) with a phase transition from hypernuclear matter to color-superconducting quark matter, where both phases are described within a relativistic density functional approach. By varying the vector meson and diquark couplings in the quark matter phase, we obtain different hybrid star sequences with varying extension of the quark matter core, ensuring consistency with astrophysical constraints from mass, radius and tidal deformability measurements. As a result, we demonstrate the impact of an increasing rotational frequency on the maximum gravitational mass, the central energy density of compact stars, the appearance of the quasi-radial oscillations and non-axisymmetric instabilities. We demonstrate that for the most favorable parameter sets with a strong vector coupling, hybrid star configurations with color superconducting quark matter core can describe the fastest spinning and heaviest galactic neutron star (NS) J0952-0607, while it is out of reach for the purely hadronic hypernuclear star configuration. We also revise the previously proposed empirical relation between the Kepler frequency, gravitational mass, and radius of non-rotating NSs, obtained based on the assumption that all NSs, up to the heaviest, are hadronic. We show how the phase transition to quark matter alters this relation and, consequently, the constraints on the dense matter EoS. Our findings reveal that incorporating the hybrid EoS has significant implications for the constraints on the properties of strongly interacting matter and NSs, placing the upper limit on km and km (considering 716 Hz frequency limit from J1748+2446ad) and 11.90~km (for 1000 Hz).

    Comments:
    21 pages, 13 figures, 3 tables
    Subjects:
    Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2412.07758 [pdf]
    PRD(2025)·17 citations

Affiliations

first authorsco-authorsvia INSPIRE