PaperPanorama

Nuclear Theory·nucl-th

Tuesday·January 8, 2019

12 papers6 primary·6 cross-listed

  1. 01

    Shrinking the Quark Gluon Plasma

    Matthew D. Sievert🇺🇸 · Jacquelyn Noronha-Hostler🇺🇸

    In recent years the understanding on the limits of the smallest possible droplet of the Quark Gluon Plasma has been called into question. Experimental results from both the Large Hadron Collider and the Relativistic Heavy Ion Collider have provided hints that the Quark Gluon Plasma may be produced in systems as small as that formed in pPb or dAu collisions. Yet alternative explanations still exist from correlations arising from quarks and gluons in a color glass condensate picture. In order to resolve these two scenarios, a system size scan has been proposed at the Large Hadron Collider for collisions of ArAr and OO. Here we make predictions for a possible future run of ArAr and OO collisions at the Large Hadron Collider and study the system size dependence of a variety of flow observables. We find that linear response (from the initial conditions to the final flow harmonics) becomes more dominant in smaller systems whereas linear+cubic response can accurately predict multi-particle cumulants for a wide range of centralities in large systems.

    nucl-thhep-phnucl-exPRC(2019)·90 citations
  2. 02

    What is wrong with our current nuclear forces?

    R. Machleidt

    I discuss ab initio predictions for light and intermediate-mass nuclei as well as nuclear matter. Problems and open issues are outlined and an attempt is made to relate them to specific deficiencies of the chiral two- and many-nucleon forces currently in use. In particular, I identify the softness of the NN potential (due to non-locality) as one important factor for the improvement of microscopic predictions. This finding is very much in tune with the recent investigation by Lu et al. (arXiv:1812.10928) where---within a simple, but realistic model---it is shown that proper nuclear matter saturation requires a considerable amout of non-locality in the NN interaction.

    nucl-thNucl.Theor.(2018)·3 citations
  3. 04

    The QCD Kondo phase in quark stars

    R. Fariello · Juan C. Macías🇧🇷 · F. S. Navarra🇧🇷

    We study light (u, d) quark matter with charm impurities. These impurities are added to the Lagrangian density. We derive the equation of state (EOS) of this kind of quark matter, which contains a Kondo phase. We explore this EOS and study the structure of stars, identifying the effects of the Kondo phase. Solving the TOV equations and computing the mass-radius diagram, we find that the presence of a Kondo phase leads to smaller and lighter stars.

    nucl-thhep-lathep-ph15 citations
  4. 05

    Phenomenological view on baryon-baryon potentials from lattice QCD simulations

    J. Haidenbauer🇩🇪 · U.-G. Meißner🇩🇪

    A qualitative discussion on the range of the potentials as they result from the phenomenological meson-exchange picture and from lattice simulations by the HAL QCD Collaboration is presented. For the former pion- and/or -meson exchange are considered together with the scalar-isoscalar component of correlated exchange. It is observed that the intuitive expectation for the behavior of the baryon-baryon potentials for large separations, associated with the exchange of one and/or two pions, does not always match with the potentials extracted from the lattice simulations. Only in cases where pion exchange provides the longest ranged contribution, like in the system, a reasonable qualitative agreement between the phenomenological and the lattice QCD potentials is found for baryon-baryon separations of fm. For the and interactions where isospin conservation rules out one-pion exchange a large mismatch is observed, with the potentials by the HAL QCD Collaboration being much longer ranged and much stronger at large distances as compared to the phenomenological expectation. This casts some doubts on the applicability of using these potentials in few- or many-body systems.

    nucl-thhep-lathep-phEPJA(2019)·12 citations
  5. 06

    Jets in non-equilibrium quark-gluon plasma

    Sigtryggur Hauksson🇨🇦 · Sangyong Jeon🇨🇦 · Charles Gale🇨🇦

    Jets are a promising way to probe the non-equilibrium physics of quark-gluon plasma (QGP). We study how an out-of-equilibrium medium induces a jet particle to emit gluons. Evaluation of the emission rate is complicated by Weibel instabilities which lead to an exponential growth of chromomagnetic fields. Deriving a quantum field theoretical description of an unstable QGP medium, we show that the chromomagnetic fields deflect jet particles during the gluon emission.

    nucl-thPoS(2018)·0 citations

Affiliations

first authorsco-authorsvia INSPIRE