PaperPanorama
FAQ

Nuclear Theory·nucl-th

Tuesday·January 3, 2023

15 papers—9 primary·6 cross-listed

All15Primary9Cross-lists6
  1. 10

    Velocity Laws for Bound States in Asymptotically AdS Geometries

    Dimitrios Giataganas🇹🇼

    We study the behavior of heavy quark bound states in moving plasmas that are dual to theories with generic non-trivial renormalization group flows interpolating between an AdS geometry in the ultraviolet and infrared fixed points with broken symmetries. We investigate analytically the observables associated with the bound state and find their scaling exponents with respect to the Lorentz factor for ultrarelativistic motion. Despite having asymptotically an AdS geometry, the scaling is not universal and depends on geometric conditions of the Fefferman-Graham expansion in the near boundary regime, or equivalently on the order of the asymptotic background expansion that provides the leading contributions to the Wilson loops.

    ↳ hep-thhep-phnucl-thFortsch.Phys.(2023)·2 citations
  2. 11

    Quark spectral functions from spectra of mesons and vice versa

    Vladimir Sauli🇨🇿

    We extract the spectral function of quarks using the QCD functional formalism.The reliability of approximations is controlled by the masses and decays of pseudoscalar mesons. For light quarks, we select the pion; for charm quarks, we choose the ground and excited states of the meson. To this end, we solved the ladder-rainbow approximation of the spectral Dyson-Schwinger equations for quarks coupled to the Bethe-Salpeter equation for the pion and pseudoscalar charmonia. The obtained dynamical charm mass function varies from 1 to 1.5 GeV in the timelike domain, which is significant for narrow charmonium states. This yields a notable response in the bound state spectrum. We obtained purely continuous spectral functions and discussed their connection with confinement.

    ↳ hep-phnucl-th4 citations
  3. 12

    Many-body collective neutrino oscillations: recent developments

    Amol V. Patwardhan🇺🇸 · Michael J. Cervia🇺🇸 · Ermal Rrapaj🇺🇸 · Pooja Siwach🇺🇸 · A. B. Balantekin🇺🇸

    Neutrino flavor transformations in core-collapse supernovae and binary neutron star mergers represent a complex and unsolved problem that is integral to our understanding of the dynamics and nucleosynthesis in these environments. The high number densities of neutrinos present in these environments can engender various collective effects in neutrino flavor transformations, driven either by neutrino-neutrino coherent scattering, or in some cases, through collisional (incoherent) interactions. An ensemble of neutrinos undergoing coherent scattering among themselves is an interacting quantum many-body system -- as such, there is a tantalising prospect of quantum entanglement developing between the neutrinos, which can leave imprints on their flavor evolution histories. Here, we seek to summarize recent progress that has been made towards understanding this phenomenon.

    ↳ hep-phastro-ph.HEnucl-thquant-phIn: Handbook of Nuclear Physics (2022), S…·26 citations
  4. 13

    Strange Stars within Bosonic and Fermionic Admixed Dark Matter

    Luiz L. Lopes🇧🇷 · H. C. Das🇮🇳

    In this work, we study dark matter (DM) admixed strange quark stars exploring the different possibilities about the nature of the DM and their effects on the macroscopic properties of strange stars, such as maximum masses, radii, as well the dimensionless tidal parameter. We observe that the DM significantly affects the macroscopic properties that depend on its mass, type, and fraction inside the star.

    ↳ astro-ph.HEgr-qchep-phnucl-thJCAP(2023)·23 citations
  5. 14

    Tribaryons with lattice QCD and one-boson exchange potentials

    Tian-Wei Wu🇨🇳 · Si-Qiang Luo🇨🇳 · Ming-Zhu Liu🇨🇳 · Li-Sheng Geng🇨🇳 · Xiang Liu🇨🇳

    Motivated by the existence of two-body hadronic molecules composed of , and predicted by lattice QCD simulations, we use the Gaussian expansion method to investigate whether three-body systems composed of , and can bind with the two-body interactions provided by lattice QCD. Our results show that none of the three-body systems bind. On the other hand, we find that with the one-boson exchange potentials the system develops a bound state, for which the interaction plays an important role. Our studies support the existence of the bound state and the nonexistence of the and bound states, due to the suppressed interactions in heavier systems.

    ↳ hep-phhep-exhep-latnucl-ex+1PRD(2023)·5 citations
  6. 15

    Multicomponent Van der Waals model of a nuclear fireball in the freeze-out stage

    Ya. D. Krivenko-Emetov (National Technical University of Ukraine - Igor Sikorsky Kyiv Polytechnic Institute, Kyiv, Ukraine)🇺🇦

    A two-component van der Waals gas model is proposed to describe the hadronic stages of the evolution of a nuclear fireball in the cooling stage. At the first stage of hadronization, when mesons dominate, a two-component meson model ( and -mesons) with an effective two-particle interaction potential of a rectangular well is proposed. At the late-stage hadronization, when almost all mesons have decayed, a two-component nucleon model of protons and neutrons is proposed with the corresponding effective rectangular nucleon potential. The saddle point method has been applied for analytical calculations of the partition function. This made it possible to uniformly obtain analytical expressions for both the pressure and density, taking into account the finite dimensions of the system, and the analytical expressions for chemical potentials. It is assumed that the proposed models and derived formulas can be used to analyze experimental data connected to the quantitative characteristics of the particle yields of different types in the final state from the hadronic stages of the evolution of a nuclear fireball, as well as to determine the critical parameters of the system in high-energy nucleus-nucleus collisions.

    ↳ hep-phnucl-thLHEP(2023)·3 citations

Affiliations

first authorsco-authorsvia INSPIRE