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Nuclear Theory·nucl-th

Tuesday·January 3, 2017

9 papers—2 primary·7 cross-listed

All9Primary2Cross-lists7
  1. 03

    [Submitted on 30 Dec 2016] (cross-list from hep-ph)

    The shear viscosity of two-flavor crystalline color superconducting quark matter

    Sreemoyee Sarkar🇮🇳 · Rishi Sharma🇮🇳

    We present the first calculation of the shear viscosity for two-flavor plane wave (FF) color superconducting quark matter. This is a member of the family of crystalline color superconducting phases of dense quark matter that may be present in the cores of neutron stars. The paired quarks in the FF phase feature gapless excitations on surfaces of crescent shaped blocking regions in momentum space and participate in transport. We calculate their contribution to the shear viscosity. We note that they also lead to dynamic screening of transverse , , gluons which are undamped in the 2SC phase. The exchange of these gluons is the most important mechanism of the scattering of the paired quarks. We find that the shear viscosity of the paired quarks is roughly a factor of smaller compared to the shear viscosity of unpaired quark matter. Our results may have implications for the damping of modes in rapidly rotating, cold neutron stars.

    Comments:
    30 pages, 20 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1701.00010 [pdf]
    PRD(2017)·15 citations
  2. 04

    [Submitted on 31 Dec 2016] (cross-list from hep-ph)

    Efectos de Temperatura Finita y Curvatura en QCD y Modelos de Quarks Quirales

    Eugenio Megias🇪🇸

    We develop the heat kernel method in the context of finite temperature quantum field theory. We compute the heat kernel expansion in the presence of general gauge and scalar fields which may be non Abelian and non stationary. The Polyakov loop appears at finite temperature as a new gauge covariant operator. We apply this method in the computation of the fully gauge invariant effective action of QCD in the regime of high temperature. It is obtained the dimensionally reduced effective action of QCD as well. In the context of chiral quark models, in particular the Nambu--Jona-Lasinio and the spectral quark model, we apply this method to compute the low-energy chiral Lagrangian at finite temperature. The coupling of the Polyakov loop with these models allows to solve some inconsistencies appearing in the standard treatment at finite temperature: generation of multi-quark states, large counting, etc. On the other hand, we show that recent available lattice data for the renormalized Polyakov loop above the deconfinement phase transition exhibit unequivocal inverse power temperature corrections driven by a dimension 2 gluon condensate. This simple ansatz provides a good overall description of the data throughout the deconfinement phase until near the critical temperature with just two parameters. Finally, we study several chiral quark models in the light of chiral perturbation theory in curved space-time. The low energy structure of the energy momentum tensor in these models with SU(3) flavor symmetry is analyzed in the presence of external gravitational fields.

    Comments:
    PhD thesis (University of Granada, Spain), April 2006. 198 pages. In Spanish
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    1701.00083 [pdf]
    Editorial of the University of Granada. I…·0 citations
  3. 05

    [Submitted on 31 Dec 2016] (cross-list from hep-th)

    Anomalous transport and massive gravity theories

    Eugenio Megias🇩🇪

    We review the Kubo formulae relevant to study anomalous transport properties of relativistic fluids. We apply this formalism to perform a computation of the transport coefficients in a holographic massive gravity model including vorticity and external electromagnetic fields. We find an interesting phase in which the electric DC conductivity is negligible, while the anomalous conductivities turn out to be nonvanishing.

    Comments:
    10 pages, 2 figures. Talk given by E.Megias at the XXIVth International Conference on Integrable Systems and Quantum symmetries (ISQS-24), Prague, Czech Republic, 14-18 June, 2016; v2 added references
    Subjects:
    High Energy Physics — Theory (hep-th); Strongly Correlated Electrons (cond-mat.str-el); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1701.00085 [pdf]
    J.Phys.Conf.Ser.(2017)·4 citations
  4. 06

    [Submitted on 31 Dec 2016] (cross-list from hep-th)

    Anomaly induced transport in non-anomalous currents

    Eugenio Megias🇩🇪

    Quantum anomalies are one of the subtlest properties of relativistic field theories. They give rise to non-dissipative transport coefficients in the hydrodynamic expansion. In particular a magnetic field can induce an anomalous current via the chiral magnetic effect. In this work we explore the possibility that anomalies can induce a chiral magnetic effect in non-anomalous currents as well. This effect is implemented through an explicit breaking of the symmetries.

    Comments:
    8 pages, 1 figure. Presented by E.Megias at the 5th International Conference on New Frontiers in Physics (ICNFP 2016), 6-14 July 2016, Kolymbari, Crete, Greece; v2 added references
    Subjects:
    High Energy Physics — Theory (hep-th); Strongly Correlated Electrons (cond-mat.str-el); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1701.00087 [pdf]
    EPJ Web Conf.(2017)·4 citations
  5. 07

    [Submitted on 31 Dec 2016] (cross-list from hep-ph)

    Legendre Analysis of Differential Distributions in Hadronic Reactions

    Yakov I. Azimov (PNPI)🇷🇺 · Igor I. Strakovsky (GWU)🇺🇸 · William J. Briscoe (GWU)🇺🇸 · Ron L. Workman (GWU)🇺🇸

    Modern experimental facilities, such as CBELSA, ELPH, JLab, MAMI and SPring-8 have provided a tremendous volume of data, often with wide energy and angular coverage, and with increasing precision. For reactions with two hadrons in the final state, these data are often presented as multiple sets of panels, with angular distributions at numerous specific energies. Such presentations have limited visual appeal, and their physical content is typically extracted through some model- dependent treatment. Instead, we explore the use of a Legendre series expansion with a relatively small number of essential coefficients. This approach has been applied in several recent experimental investigations. We present some general properties of the Legendre coefficients in the helicity framework and consider what physical information can be extracted without any model-dependent assumptions.

    Comments:
    13 pgs, 3 figs
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1701.00124 [pdf]
    PRC(2017)·4 citations
  6. 08

    [Submitted on 1 Jan 2017] (cross-list from hep-lat)

    Volume Dependence of N-Body Bound States

    Sebastian König🇩🇪 · Dean Lee🇺🇸

    We derive the finite-volume correction to the binding energy of an N-particle quantum bound state in a cubic periodic volume. Our results are applicable to bound states with arbitrary composition and total angular momentum, and in any number of spatial dimensions. The only assumptions are that the interactions have finite range. The finite-volume correction is a sum of contributions from all possible breakup channels. In the case where the separation is into two bound clusters, our result gives the leading volume dependence up to exponentially small corrections. If the separation is into three or more clusters, there is a power-law factor that is beyond the scope of this work, however our result again determines the leading exponential dependence. We also present two independent methods that use finite-volume data to determine asymptotic normalization coefficients. The coefficients are useful to determine low-energy capture reactions into weakly bound states relevant for nuclear astrophysics. Using the techniques introduced here, one can even extract the infinite-volume energy limit using data from a single-volume calculation. The derived relations are tested using several exactly solvable systems and numerical examples. We anticipate immediate applications to lattice calculations of hadronic, nuclear, and cold atomic systems.

    Comments:
    11 pages, 3 figures; Haskell code provided as ancillary file. Added discussion of single-volume extrapolations. Matches published version
    Subjects:
    High Energy Physics — Lattice (hep-lat); Quantum Gases (cond-mat.quant-gas); Mathematical Physics (math-ph); math.MP (math.MP); Nuclear Theory (nucl-th)
    arXiv:
    1701.00279 [pdf]
    PLB(2018)·70 citations
  7. 09

    [Submitted on 1 Jan 2017] (cross-list from hep-ph)

    The Mar(e)k of QGP: Strangeness

    Jan Rafelski🇺🇸

    Strangeness signature of of quark-gluon plasma (QGP) is central to the exploration of baryon-dense matter: the search for the critical point and onset of deconfinement. I report on the discovery of QGP by means of strangeness: The key historical figures and their roles in this quest are introduced and the experimental results obtained are discussed. The important role of antihyperons is emphasized. The statistical hadronization model, and sudden hadronization are described. Results of present day data analysis: strangeness and entropy content of a large fireball, and the universal hadronization condition describing key features of all explored collision systems are presented.

    Comments:
    27 pages, 9 figures, Based on two invited lectures presented at CPOD (Critical Point and Onset of Deconfinement) International Conference held in Wroclaw, Poland May 30th --June 4th, 2016, dedicated to Marek Gaździcki on occasion of his 60th birthday, v2: shortened upon request of editors
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th); History and Philosophy of Physics (physics.hist-ph)
    arXiv:
    1701.00296 [pdf]
    Acta Phys.Polon.Supp.B(2017)·1 citation

Affiliations

first authorsco-authorsvia INSPIRE