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Nuclear Theory·nucl-th

Monday·August 3, 2015

10 papers—6 primary·4 cross-listed

All10Primary6Cross-lists4
  1. 07

    [Submitted on 31 Jul 2015] (cross-list from hep-ph)

    Polyakov--Nambu--Jona-Lasinio model in finite volumes

    Abhijit Bhattacharyya🇮🇳 · Sanjay K. Ghosh🇮🇳 · Rajarshi Ray🇮🇳 · Kinkar Saha🇮🇳 · Sudipa Upadhaya🇮🇳

    We discuss the 2+1 flavor Polyakov loop enhanced Nambu--Jona-Lasinio model in a finite volume. The main objective is to check the volume scaling of thermodynamic observables for various temperatures and chemical potentials. We observe the possible violation of the scaling with system size in a considerable window along the whole transition region in the plane.

    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1507.08795 [pdf]
    EPL(2016)·27 citations
  2. 08

    [Submitted on 31 Jul 2015] (cross-list from hep-lat)

    Massive photons: an infrared regularization scheme for lattice QCD+QED

    Michael G. Endres🇺🇸 · Andrea Shindler🇩🇪 · Brian C. Tiburzi🇺🇸 · Andre Walker-Loud🇺🇸

    Standard methods for including electromagnetic interactions in lattice quantum chromodynamics calculations result in power-law finite-volume corrections to physical quantities. Removing these by extrapolation requires costly computations at multiple volumes. We introduce a photon mass to alternatively regulate the infrared, and rely on effective field theory to remove its unphysical effects. Electromagnetic modifications to the hadron spectrum are reliably estimated with a precision and cost comparable to conventional approaches that utilize multiple larger volumes. A significant overall cost advantage emerges when accounting for ensemble generation. The proposed method may benefit lattice calculations involving multiple charged hadrons, as well as quantum many-body computations with long-range Coulomb interactions.

    Comments:
    6 pages, 4 figures, 2 tables; significant revisions to abstract and main text; revised presentation of results for clarity (results unchanged); acknowledgements updated; matches published version
    Subjects:
    High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1507.08916 [pdf]
    PRL(2016)·91 citations
  3. 09

    [Submitted on 31 Jul 2015] (cross-list from hep-ph)

    The impact of quark masses on pQCD thermodynamics

    Thorben Graf🇩🇪 · Juergen Schaffner-Bielich🇩🇪 · Eduardo S. Fraga🇧🇷

    We present results for several thermodynamic quantities within the next-to-leading order calculation of the thermodynamic potential in perturbative QCD at finite temperature and chemical potential including non-vanishing quark masses. These results are compared to lattice data and to higher-order optimized perturbative calculations to investigate the trend brought about by mass corrections.

    Comments:
    V2: Major modifications; 12 pages, 13 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1507.08941 [pdf]
    EPJA(2016)·22 citations
  4. 10

    [Submitted on 31 Jul 2015] (cross-list from hep-ph)

    Flavor instabilities in the multi-angle neutrino line model

    Sajad Abbar🇺🇸 · Huaiyu Duan🇺🇸 · Shashank Shalgar (UNM)🇺🇸

    Neutrino flavor oscillations in the presence of ambient neutrinos is nonlinear in nature which leads to interesting phenomenology that has not been well understood. It was recently shown that, in the two-dimensional, two-beam neutrino Line model, the inhomogeneous neutrino oscillation modes on small distance scales can become unstable at larger neutrino densities than the homogeneous mode does. We develop a numerical code to solve neutrino oscillations in the multi-angle/beam Line model with a continuous neutrino angular distribution. We show that the inhomogeneous oscillation modes can occur at even higher neutrino densities in the multi-angle model than in the two-beam model. We also find that the inhomogeneous modes on sufficiently small scales can be unstable at smaller neutrino densities with ambient matter than without, although a larger matter density does shift the instability region of the homogeneous mode to higher neutrino densities in the Line model as it does in the one-dimensional supernova Bulb model. Our results suggest that the inhomogeneous neutrino oscillation modes can be difficult to treat numerically because the problem of spurious oscillations becomes more severe for oscillations on smaller scales.

    Comments:
    9 pages, 5 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
    arXiv:
    1507.08992 [pdf]
    PRD(2015)·57 citations

Affiliations

first authorsco-authorsvia INSPIRE