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Nuclear Theory·nucl-th

Tuesday·March 5, 2019

15 papers—11 primary·4 cross-listed

All15Primary11Cross-lists4
  1. 12

    [Submitted on 1 Mar 2019] (cross-list from hep-ph)

    Gluon bremsstrahlung in finite media beyond multiple soft scattering approximation

    Yacine Mehtar-Tani🇺🇸

    We revisit the calculation of the medium-induced gluon spectrum in a finite QCD and develop a new approach that goes beyond multiple soft scattering approximation. We show by expanding around the harmonic oscillator that the first two orders encompass the two known analytic limits: single hard and multiple soft scattering regimes, valid at high and low frequencies, respectively. Finally, we investigate the sensitivity of our results to the infrared and observe that for large media the spectrum is weakly dependent on the infrared medium scale.

    Comments:
    22 pages, 5 figures, minor corrections, to appear in JHEP
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1903.00506 [pdf]
    JHEP(2019)·83 citations
  2. 13

    [Submitted on 1 Mar 2019] (cross-list from quant-ph)

    Applications of the worldline Monte Carlo formalism in quantum mechanics

    James P. Edwards · Urs Gerber · Christian Schubert · Maria Anabel Trejo · Thomai Tsiftsi · Axel Weber

    In recent years efficient algorithms have been developed for the numerical computation of relativistic single-particle path integrals in quantum field theory. Here, we adapt this "worldline Monte Carlo" approach to the standard problem of the numerical approximation of the non-relativistic path integral, resulting in a formalism whose characteristic feature is the fast, non-recursive generation of an ensemble of trajectories that is independent of the potential, and thus universally applicable. The numerical implementation discretises the trajectories with respect to their time parametrisation but maintains a continuous spatial domain. In the case of singular potentials, the discretised action gets adapted to the singularity through a "smoothing" procedure. We show for a variety of examples (the harmonic oscillator in various dimensions, the modified Pöschl-Teller potential, delta-function potentials, the Coulomb and Yukawa potentials) that the method allows one to obtain fast and reliable estimates for the Euclidean propagator and use them in a certain time window suitable for extracting the ground state energy. As an aside, we apply it for studying the classical limit where nearly classical trajectories are expected to dominate in the path integral. We expect the advances made here to be useful also in the relativistic case.

    Comments:
    51 + 13 pages. Many figures
    Subjects:
    Quantum Physics (quant-ph); Nuclear Theory (nucl-th); Atomic Physics (physics.atom-ph); Computational Physics (physics.comp-ph)
    arXiv:
    1903.00536 [pdf]
    Annals Phys.(2019)·8 citations
  3. 14

    [Submitted on 3 Mar 2019] (cross-list from hep-th)

    Chiral transport in strong fields from holography

    Yanyan Bu🇨🇳 · Tuna Demircik🇮🇱 · Michael Lublinsky🇮🇱

    Anomaly-induced transport phenomena in presence of strong external electromagnetic fields are explored within a 4D field theory defined holographically as Maxwell-Chern-Simons theory in Schwarzschild-. Two complementary studies are reported. In the first one, we present results on the Ohmic conductivity, diffusion constant, chiral magnetic conductivity, and additional anomaly-induced transport coefficients as functions of external e/m fields. Next, gradient resummation in a constant background magnetic field is performed. All-order resummed constitutive relations are parameterised by four momenta-dependent transport coefficient functions (TCFs). A highlight of this part is a thorough study of {\it non-dissipative} chiral magnetic waves (CMW) in strong magnetic fields.

    Comments:
    v1: 33 pages, 13 figures; v2: published version
    Subjects:
    High Energy Physics — Theory (hep-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1903.00896 [pdf]
    JHEP(2019)·12 citations
  4. 15

    [Submitted on 4 Mar 2019] (cross-list from hep-ph)

    Higher-order corrections to jet quenching

    Yacine Mehtar-Tani🇺🇸 · Konrad Tywoniuk🇳🇴

    We compute the inclusive jet spectrum in the presence of a dense QCD medium by going beyond the single parton energy loss approximation. We show that higher-order corrections are important yielding large logarithmic contributions that must be resummed to all orders. This reflects the fact that jet quenching is sensitive to fluctuations of the jet substructure.

    Comments:
    4 pages, 1 figure, talk presented at the International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions (Hard Probes 2018), 30 September - 5 October 2018, Aix-Les-Bains, Savoie, France
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1903.01302 [pdf]
    PoS(2019)·1 citation

Affiliations

first authorsco-authorsvia INSPIRE