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Nuclear Theory·nucl-th

Thursday·March 2, 2017

5 papers—2 primary·3 cross-listed

All5Primary2Cross-lists3
  1. 03

    [Submitted on 27 Feb 2017] (cross-list from astro-ph.HE)

    Cooling of neutron stars in soft X-ray transients

    Sophia Han · Andrew W. Steiner

    Thermal states of neutron stars in soft X-ray transients (SXRTs) are thought to be determined by "deep crustal heating" in the accreted matter that drives the quiescent luminosity and cooling via emission of photons and neutrinos from the interior. In this study, we assume a global thermal steady-state of the transient system and calculate the heating curves (quiescent surface luminosity as a function of mean accretion rate) predicted from theoretical models, taking into account variations in the equations of state, superfluidity gaps, thickness of the light element layer and a phenomenological description of the direct Urca threshold. We further provide a statistical analysis on the uncertainties in these parameters, and compare the overall results with observations of several SXRTs, in particular the two sources containing the coldest (SAX J1808.4-3658) and the hottest (Aql X-1) neutron stars. Interpretation of the observational data indicates that the direct Urca process is required for the most massive stars and also suggests small superfluid gaps.

    Comments:
    15 pages, 10 figures; typos corrected; extended discussions on the likelihood function and quality of the fit; interpretation of superfluid gaps and direct Urca threshold has been elaborated
    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); Solar and Stellar Astrophysics (astro-ph.SR); Nuclear Theory (nucl-th)
    arXiv:
    1702.08452 [pdf]
    PRC(2017)·24 citations
  2. 04

    [Submitted on 28 Feb 2017] (cross-list from hep-ph)

    Broken boost invariance in the Glasma via finite nuclei thickness

    Andreas Ipp🇦🇹 · David Müller🇦🇹

    We simulate the creation and evolution of non-boost-invariant Glasma in the early stages of heavy ion collisions within the color glass condensate framework. This is accomplished by extending the McLerran-Venugopalan model to include a parameter for the Lorentz-contracted but finite width of the nucleus in the beam direction. We determine the rapidity profile of the Glasma energy density, which shows deviations from the boost-invariant result. Varying the parameters both broad and narrow profiles can be produced. We compare our results to experimental data from RHIC and find surprising agreement.

    Comments:
    6 pages, 4 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1703.00017 [pdf]
    PLB(2017)·40 citations
  3. 05

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

    GPDs at non-zero skewness in ADS/QCD model

    Matteo Rinaldi🇪🇸

    We study Generalized Parton Distribution functions (GPDs) usually measured in hard exclusive processes and encoding information on the three dimensional partonic structure of hadrons and their spin decomposition, for non zero skewness within the AdS/QCD formalism. To this aim the canonical scheme to calculate GPDs at zero skewness has been properly generalized. Furthermore, we show that the latter quantities, in this non forward regime, are sensitive to non trivial details of the hadronic light front wave function, such as a kind of parton correlations usually not accessible in studies of form factors and GPDs at zero skewness.

    Comments:
    6 pages, 7 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1703.00348 [pdf]
    PLB(2017)·25 citations

Affiliations

first authorsco-authorsvia INSPIRE