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Nuclear Theory·nucl-th

Thursday·August 29, 2024

6 papers—1 primary·5 cross-listed

All6Primary1Cross-lists5
  1. 01

    [Submitted on 28 Aug 2024]

    Strongly Interacting Quark Matter in Massive Quark Stars

    Adamu Issifu🇧🇷 · Franciele M. da Silva🇧🇷 · Luis C. N. Santos🇧🇷 · Débora P. Menezes🇧🇷 · Tobias Frederico🇧🇷

    This paper investigates the properties of strongly coupled matter at high baryon densities (\(\rho_B\)) in quark stars (QSs). The QS model is based on the density-dependent quark mass (DDQM) framework, modified (MDDQM) by enhancing the single-gluon interaction to generate higher repulsive pressure. The model parameters are constrained using Bayesian inference, incorporating observational data from the pulsars HESS J1731347, PSR J00300451, PSR J07406620, and PSR J09520607. Our results show that the MDDQM model produces QSs with higher mass and compactness compared to the DDQM model. Among the four MDDQM parameterizations studied, two yield maximum star masses of 1.86 and 2.10 \(\rm M_\odot\) and exhibit near-conformal behavior in the underlying quark matter (QM). The other two parameterizations, yielding QS masses of 2.30 and 2.37 \(\rm M_\odot\), correspond to a stronger interaction in the underlying QM. These findings provide important insights into the equation of state of deconfined QM and its implications for the structure and stability of QSs.

    Comments:
    21 pages, 9 figures. Accepted version in Class. Quantum Grav
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    2408.15889 [pdf]
    2 citations
  2. 02

    [Submitted on 27 Aug 2024] (cross-list from astro-ph.HE)

    Constraints on the parameter space in dark matter admixed neutron stars

    Ankit Kumar🇯🇵 · Hajime Sotani🇯🇵

    We investigate the impact of dark matter on neutron star properties using the relativistic mean-field theory. By incorporating the dark matter model, we explore how dark matter parameters, specifically dark matter mass and Fermi momentum, influence nuclear saturation properties, the equation of state, and the mass-radius relationship of neutron stars. We also examine the universal relation between dimensionless tidal deformability and compactness in the presence of dark matter. Our results show that the inclusion of dark matter significantly alters nuclear saturation properties, leading to higher incompressibility and symmetry energy values. Notably, higher dark matter Fermi momenta and masses result in more compact neutron star configurations with reduced radii and lower maximum masses, highlighting a complex interplay between dark matter and nuclear matter. Deviations from the universal relation are observed with dark matter inclusion, particularly for neutron stars with lower compactness. By leveraging observational data from PSR J0740+6620, GW170817, and Neutron star Interior Composition Explorer (NICER) measurements of PSR J0030+0451, we derive stringent constraints on dark matter parameter space within neutron stars, emphasizing the necessity of integrating multimodal observations to delineate the properties of dark matter along with neutron stars. Our findings underscore the importance of considering dark matter effects in neutron star modeling and suggest potential refinements for current theoretical frameworks to accurately predict neutron star properties under various astrophysical conditions.

    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
    arXiv:
    2408.15312 [pdf]
    PRD(2024)·25 citations
  3. 03

    [Submitted on 27 Aug 2024] (cross-list from hep-ph)

    Production and in-medium modification of mesons in proton-nucleus reactions from a transport approach

    Philipp Gubler🇯🇵 · Masaya Ichikawa🇯🇵 · Taesoo Song🇩🇪 · Elena Bratkovskaya🇩🇪

    Production and in-medium modification of hidden strange mesons are studied in proton-nucleus reactions - p+C, p+Cu and p+Pb - at 12 GeV/c, partially measured by the KEK E325 collaboration via the dilepton decay mode. This work is based on the off-shell microscopic Parton-Hadron-String Dynamics (PHSD) transport approach, which provides the dynamical description of strongly interacting hadronic and partonic degrees of freedom in dense matter, and especially makes it possible to simulate in-medium off-shell dynamics of the meson in the reactions studied. Different in-medium scenarios for the modification of the meson spectral function in nuclear matter are investigated: i) dropping pole mass, ii) collisional broadening and iii) simultaneous dropping pole mass and collisional broadening. Even though the meson production in p+A reactions occurs only at densities around or below normal nuclear matter density , we find visible modifications of the generated dilepton spectra for the in-medium scenarios compared to the vacuum distribution.

    Comments:
    11 pages, 7 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2408.15364 [pdf]
    PRC(2025)·14 citations
  4. 04

    [Submitted on 27 Aug 2024] (cross-list from hep-ph)

    Infrared properties of the quark-gluon vertex in general kinematics

    A. C. Aguilar🇧🇷 · M. N. Ferreira🇨🇳 · G. T. Linhares🇧🇷 · B. M. Oliveira🇪🇸 · J. Papavassiliou🇧🇷

    In the present work we determine the eight form factors of the transversely-projected quark-gluon vertex in general kinematics, in the context of Landau-gauge QCD with two degenerate light dynamical quarks. The study is based on the set of Schwinger-Dyson equations that govern the vertex form factors, derived within the formalism of the three-particle-irreducible (3PI) effective action. The analysis is performed by employing lattice data for the main ingredients, such as gluon and quark propagators, and three-gluon vertex. The numerical treatment is simplified by decoupling the system of integral equations: the classical form factor is determined from a single non-linear equation involving only itself, while the remaining ones are subsequently computed through simple integrations. The form factors are obtained for arbitrary values of space-like momenta, and their angular dependence is examined in detail. A clear hierarchy is established at the level of the corresponding dimensionless effective couplings, in agreement with results of earlier studies. Furthermore, the classical form factor is found to be in excellent agreement with recent unquenched lattice data in the soft-gluon configuration, while the two non-classical dressings depart substantially from the lattice results. Finally, the accurate implementation of multiplicative renormalizability is confirmed, and the transition from Minkoswski to Euclidean space is elucidated.

    Comments:
    39 pages, 15 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    2408.15370 [pdf]
    EPJC(2024)·22 citations
  5. 05

    [Submitted on 28 Aug 2024] (cross-list from hep-ph)

    Investigating the - Interaction and Correlation Functions

    Ye Yan🇨🇳 · Qi Huang🇨🇳 · Youchang Yang🇨🇳 · Hongxia Huang🇨🇳 · Jialun Ping🇨🇳

    Motivated by experimental measurements, we investigate the - correlation functions and interactions on the basis of a quark model. By solving the inverse scattering problem with channel coupling, we renormalize the coupling to other channels into an effective single-channel - potentials. The effects of Coulomb interaction and spin-averaging are also discussed. According to our results, the depletion of the - correlation functions, which is attributed to the bound state not observed in the ALICE Collaboration's measurements [Nature \textbf{588}, 232 (2020)], can be explained by the contribution of the attractive component in spin-averaging. So far, we have provided a consistent description of the - system from the perspective of the quark model, including the energy spectrum, scattering phase shifts, and correlation functions. The existence of the - bound state has been supported by all three aspects. Additionally, a sign of the - correlation function's subtle sub-unity part can be seen in experimental measurements, which warrants more precise verification in the future.

    Comments:
    12 pages, 6 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2408.15493 [pdf]
    SCPMA(2025)·15 citations
  6. 06

    [Submitted on 28 Aug 2024] (cross-list from hep-ph)

    The pressure of hot Yang-Mills theory: Canonical form of the integrand

    Pablo Navarrete🇨🇱 · York Schröder🇨🇱

    We present major progress towards the determination of the last missing piece for the pressure of a Yang-Mills plasma at high temperatures at order in the strong coupling constant. This order is of key importance due to its role in resolving the long-standing infrared problem of finite-temperature field theory within a dimensionally reduced effective field theory setup. By systematically applying linear transformations of integration variables, or momentum shifts, we resolve equivalences between different representations of Feynman sum-integrals. on the integrand level, transforming those into a canonical form. At the order , this results in reducing a sum of O(100000) distinct sum-integrals which are produced from all four-loop vacuum diagrams down to merely 21. Furthermore, we succeed to map 11 of those onto known lower-loop structures. This leaves only 10 genuine 4-loop sum-integrals to be evaluated, thereby bringing the finalization of three decades of theoretical efforts within reach.

    Comments:
    20 pages, 4 figures; v2: some typos fixed, lower-loop results added
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    2408.15830 [pdf]
    JHEP(2024)·18 citations

Affiliations

first authorsco-authorsvia INSPIRE