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Nuclear Theory·nucl-th

Friday·October 5, 2018

9 papers—5 primary·4 cross-listed

All9Primary5Cross-lists4
  1. 06

    Evolution of non-stationary pulses in a cold magnetized quark-gluon plasma

    D. A. Fogaça🇧🇷 · R. Fariello🇧🇷 · F. S. Navarra🇧🇷 · Y. A. Stepanyants🇦🇺

    We study weakly nonlinear wave perturbations propagating in a cold nonrelativistic and magnetized ideal quark-gluon plasma. We show that such perturbations can be described by the Ostrovsky equation. The derivation of this equation is presented for the baryon density perturbations. Then we show that the generalized nonlinear Schrödinger (NLS) equation can be derived from the Ostrovsky equation for the description of quasi-harmonic wave trains. This equation is modulationally stable for the wave number and unstable for , where is the wave number where the group velocity has a maximum. We study numerically the dynamics of initial wave packets with the different carrier wave numbers and demonstrate that depending on the initial parameters they can evolve either into the NLS envelope solitons or into dispersive wave trains.

    ↳ hep-phhep-thnucl-thCommun.Nonlinear Sci.Numer.Simul.(2020)·1 citation
  2. 07

    Description of phi-meson production in hadronic and nuclear collisions at very high energies

    G.H.Arakelyan🇦🇲 · C. Merino🇪🇸 · Yu.M. Shabelski🇷🇺

    We expose the current experimental and theoretical situation of the interesting case of the production of phi mesons in up to very high energy collisions of hadrons on both nucleon and nuclear targets, and we present a quantitavely good theoretical description of the corresponding experimental data, based on the formalism of the well established Quark-Gluon String Model, that has proved to be valid for a wide energy range. All the available experimental data for phi-meson production in hadron-nucleon collisions on the spectra of secondary phi, and on the ratios of phi/pi(-) and phi/K(-) production cross sections, as well the corresponding ones for phi-meson production on nuclear targets, are considered. In particular, it is seen that the production of phi-mesons on nuclear targets presents unusually small shadow corrections for the inclusive density in the central rapidity region.

    ↳ hep-phnucl-thInt.J.Mod.Phys.A(2018)·3 citations
  3. 08

    Realistic in-medium heavy-quark potential from high statistics lattice QCD simulations

    Peter Petreczky🇺🇸 · Alexander Rothkopf🇳🇴 · Johannes Weber🇺🇸

    We present our first results on a direct computation of the complex in-medium heavy quark potential from realistic lattice QCD simulations. Ensembles with from the HotQCD and TUMQCD collaboration offer unprecedented high statistics, those with unprecedented time resolution, making possible a robust extraction of the real part from the spectral functions of Wilson line correlators. To this end we deploy a combination of a Bayesian reconstruction (BR method), as well as a Padé-like approximation. We corroborate findings made on less realistic lattices that smoothly transitions from a confining to a screened behavior at high temperatures and its values lie close to the color singlet free energies. A finite value of the is observed in the quark-gluon-plasma phase.

    ↳ hep-lathep-phnucl-thNPA(2019)·33 citations
  4. 09

    Holographic Bjorken Flow at Large-D

    Jorge Casalderrey-Solana🇪🇸 · Christopher P. Herzog🇬🇧 · Ben Meiring🇬🇧

    We use gauge/gravity duality to study the dynamics of strongly coupled gauge theories undergoing boost invariant expansion in an arbitrary number of space-time dimensions (D). By keeping the scale of the late-time energy density fixed, we explore the infinite-D limit and study the first few corrections to this expansion. In agreement with other studies, we find that the large-D dynamics are controlled by hydrodynamics and we use our computation to constrain the leading large-D dependence of a certain combination of transport coefficients up to 6-th order in gradients. Going beyond late time physics, we discuss how non-hydrodynamic modes appear in the large-D expansion in the form of a trans-series in D, identical to the non-perturbative contributions to the gradient expansion. We discuss the consequence of this trans-series in the non-convergence of the large-D expansion.

    ↳ hep-thhep-phnucl-thJHEP(2019)·18 citations

Affiliations

first authorsco-authorsvia INSPIRE