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Nuclear Theory·nucl-th

Tuesday·July 18, 2023

19 papers—4 primary·15 cross-listed

All19Primary4Cross-lists15
  1. 01

    Prescaling relaxation to nonthermal attractors

    Michal P. Heller🇧🇪 · Aleksas Mazeliauskas🇩🇪 · Thimo Preis🇩🇪

    We study how isotropic and homogeneous far-from-equilibrium quantum systems relax to nonthermal attractors, which are of interest for cold atoms and nuclear collisions. We demonstrate that a first-order ordinary differential equation governs the self-similar approach to nonthermal attractors, i.e., the prescaling. We also show that certain natural scaling-breaking terms induce logarithmically slow corrections that prevent the scaling exponents from reaching the constant values during the system's lifetime. We propose that, analogously to hydrodynamic attractors, the appropriate mathematical structure to describe such dynamics is the transseries. We verify our analytic predictions with state-of-the-art 2PI simulations of the large-N vector model and QCD kinetic theory.

    hep-thcond-mat.quant-gashep-phnucl-thPRL(2024)·23 citations
  2. 02

    Energy Loss in Small Collision Systems

    Coleridge Faraday🇿🇦 · W. A. Horowitz🇿🇦

    We present leading hadron suppression predictions in and collisions from a convolved radiative and collisional energy loss model in which partons propagate through a realistic background, and in which the radiative energy loss receives a short pathlength correction. We find that the short pathlength correction is small for meson in both and collisions. However the short pathlength correction leads to a surprisingly large reduction in suppression for mesons in and even collisions, providing a qualitative explanation for the rapid rise in meson at the LHC. We find that the size of the short pathlength correction to is acutely sensitive to the chosen distribution of scattering centers in the plasma. Furthermore we find that conventional elastic energy loss models, which apply the central limit theorem to the number of scatterings, dramatically overpredict suppression in collisions, calling for short pathlength corrections to elastic energy loss.

    nucl-thhep-phPoS(2024)·3 citations
  3. 03

    Illuminating early-stage dynamics of heavy-ion collisions through photons at RHIC BES energies

    Chun Shen🇺🇸 · Abel Noble🇺🇸 · Jean-François Paquet🇺🇸 · Björn Schenke🇺🇸 · Charles Gale🇨🇦

    Heavy-ion collisions at GeV probe the QCD phase diagram at large baryon densities. Because the longitudinal Lorentz contraction is small at these collision energies, understanding the dynamics during the early phase of the collision is essential for the subsequent modeling of the system evolution and for constraining the QGP transport properties at finite baryon densities. Direct photons provide undistorted information on early-stage dynamics. We model relativistic heavy-ion collisions at RHIC Beam Energy Scan energies with a hybrid dynamical approach consisting of a 3D-Glauber initial state followed by viscous hydrodynamics and hadronic transport (MUSIC + UrQMD). The implemented thermal photon emission takes into account the enhancement from finite baryon chemical potentials. We show that direct photon spectra and their anisotropic flow coefficients have a strong sensitivity to the early stage of heavy-ion collisions. Thus, they provide constraints on QGP dynamics complementary to those obtained from hadronic observables.

    nucl-thhep-phnucl-exPoS(2024)·8 citations
  4. 04

    Canonical Ensemble vs. Grand Canonical Ensemble in the Description of Multicomponent Bosonic Systems

    D. Anchishkin · V. Gnatovskyy · D. Zhuravel · V. Karpenko · I. Mishustin · H. Stoecker

    The thermodynamics of a system of interacting bosonic particles and antiparticles in the presence of the Bose-Einstein condensate is studied in the framework of the Skyrme-like mean-field model. It is assumed that the total charge density (isospin density) is conserved at all temperatures. Two cases are explicitly considered: zero and nonzero isospin charge of the system. A comparative analysis is carried out using Canonical Ensemble and Grand Canonical Ensemble. It is shown that the Grand Canonical Ensemble is not suitable for describing bosonic systems of particles and antiparticles in the presence of condensate.

    nucl-thhep-phquant-phUkr.J.Phys.(2024)·1 citation

Affiliations

first authorsco-authorsvia INSPIRE