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Nuclear Theory·nucl-th

Thursday·March 10, 2016

12 papers—9 primary·3 cross-listed

All12Primary9Cross-lists3
  1. 10

    [Submitted on 8 Mar 2016] (cross-list from astro-ph.HE)

    Masses, Radii, and Equation of State of Neutron Stars

    Feryal Ozel🇺🇸 · Paulo Freire🇩🇪

    We summarize our current knowledge of neutron star masses and radii. Recent instrumentation and computational advances have resulted in a rapid increase in the discovery rate and precise timing of radio pulsars in binaries in the last few years, leading to a large number of mass measurements. These discoveries show that the neutron star mass distribution is much wider than previously thought, with 3 known pulsars now firmly in the 1.9-2.0 Msun mass range. For radii, large, high quality datasets from X-ray satellites as well as significant progress in theoretical modeling led to considerable progress in the measurements, placing them in the 9.9-11.2 km range and shrinking their uncertainties due to a better understanding of the sources of systematic errors. The combination of the massive neutron star discoveries, the tighter radius measurements, and improved laboratory constraints of the properties of dense matter has already made a substantial impact on our understanding of the composition and bulk properties of cold nuclear matter at densities higher than that of the atomic nucleus, a major unsolved problem in modern physics.

    Comments:
    To be published in Annual Reviews of Astronomy and Astrophysics 2016. All mass, radius, and equation of state data are available at http://xtreme.as.arizona.edu/NeutronStars
    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); General Relativity and Quantum Cosmology (gr-qc); Nuclear Theory (nucl-th)
    arXiv:
    1603.02698 [pdf]
    Ann.Rev.Astron.Astrophys.(2016)·1503 citations
  2. 11

    [Submitted on 8 Mar 2016] (cross-list from hep-ph)

    Exploring as a meson molecule

    S. S. Agaev🇦🇿 · K. Azizi🇹🇷 · H. Sundu🇹🇷

    The parameters, i.e. the mass and current coupling of the exotic state observed by the D0 Collaboration as well as the decay width of the process are explored using molecule assumption on its structure. Employed computational methods include QCD two-point and light-cone sum rules, latter being considered in the soft-meson approximation. The obtained results are compared with the data of the D0 Collaboration as well as with the predictions of the diquark-antidiquark model. This comparison strengthens a diquark-antidiquark picture for the state rather than a meson molecule structure.

    Comments:
    7 Pages, 2 Figures and 1 Table
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
    arXiv:
    1603.02708 [pdf]
    Eur.Phys.J.Plus(2016)·51 citations
  3. 12

    [Submitted on 9 Mar 2016] (cross-list from hep-ph)

    Dyson-Schwinger Approach to Color-Superconductivity: Effects of Selfconsistent Gluon Dressing

    Daniel Müller🇺🇸 · Michael Buballa🇩🇪 · Jochen Wambach🇩🇪

    The phase diagram of dense QCD at nonvanishing temperatures and large quark chemical potentials is studied with Dyson-Schwinger equations for 2+1 quark flavors, focusing on color-superconducting phases with 2SC and CFL-like pairing. The truncation scheme of our previous investigations is extended to include the dressing of gluons with selfconsistently determined quarks, i.e., taking into account the dynamical masses and superconducting gaps of the quarks in the gluon polarization. As a consequence the gluon screening is reduced, leading to an enhancement of the critical temperatures of the color-superconducting phases by about a factor of 2 as compared to the case where the gluons are dressed with bare quarks. We also calculate the Debye and Meissner masses of the gluons and show that they are consistent with weak-coupling results.

    Comments:
    15 pages, 12 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1603.02865 [pdf]
    24 citations

Affiliations

first authorsco-authorsvia INSPIRE