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Nuclear Theory·nucl-th

Wednesday·March 23, 2016

8 papers—5 primary·3 cross-listed

All8Primary5Cross-lists3
  1. 06

    [Submitted on 21 Mar 2016] (cross-list from astro-ph.HE)

    Model-Independent Inference of Neutron Star Radii from Moment of Inertia Measurements

    Carolyn A. Raithel · Feryal Ozel · Dimitrios Psaltis

    A precise moment of inertia measurement for PSR J0737-3039A in the double pulsar system is expected within the next five years. We present here a new method of mapping the anticipated measurement of the moment of inertia directly into the neutron star structure. We determine the maximum and minimum values possible for the moment of inertia of a neutron star of a given radius based on physical stability arguments, assuming knowledge of the equation of state only at densities below the nuclear saturation density. If the equation of state is trusted up to the nuclear saturation density, we find that a measurement of the moment of inertia will place absolute bounds on the radius of PSR J0737-3039A to within 1 km. The resulting combination of moment of inertia, mass, and radius measurements for a single source will allow for new, stringent constraints on the dense-matter equation of state.

    Comments:
    Published in Physical Review C, Rapid Communications; Typo corrected in Eq. 5 (results unchanged)
    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); General Relativity and Quantum Cosmology (gr-qc); Nuclear Theory (nucl-th)
    arXiv:
    1603.06594 [pdf]
    PRC(2016)·39 citations
  2. 07

    [Submitted on 21 Mar 2016] (cross-list from physics.gen-ph)

    Coupling Multiple SU(2) Groups Into A SU(3) Group Structure

    Mark L. Raphaelian🇺🇸

    A specific algebraic coupling model involving multiple quantization axes is presented in which previously indistinguishable SU(2) symmetry groups become distinguishable when coupled into a SU(3) group structure. The model reveals new intrinsic angular momentum (or isospin) eigenvectors whose structural symmetries are detailed, some of which are not available for groups having only one quantization axis available for configurations. Additionally, an intrinsic cyclic ordering of the quantization axes and internal geometric phase relations between the basis states naturally fall out from the algebraic properties of the group. The nature of the coupling into a SU(3) symmetry group also allows for the definition of both positive and negative basis states along each quantization axis relative to the center of the group. These basis states configurations mimic those observed in color-charge and electroweak theories.

    Comments:
    10 pages
    Subjects:
    physics.gen-ph (physics.gen-ph)
    arXiv:
    1603.06628 [pdf]
    0 citations
  3. 08

    [Submitted on 22 Mar 2016] (cross-list from hep-ph)

    self-energy at finite temperature and density and the cross-section

    Snigdha Ghosh🇮🇳 · Sourav Sarkar🇮🇳 · Sukanya Mitra🇮🇳

    The self energy of -baryon is evaluated at finite temperature and density using the real time formalism of thermal field theory. The Dyson-Schwinger equation is used to get the exact thermal propagator followed by the spectral function of . The scattering cross section obtained using explicit exchange is normalized to the experimental data in vacuum and its medium modification is implemented by means of the exact thermal propagator. A significant suppression of the peak of the cross-section is observed at higher temperature and baryon density. Effects on the mean relaxation time of nucleons and the temperature dependence of the shear viscosity of a pion nucleon gas are demonstrated.

    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1603.06699 [pdf]
    PRD(2017)·11 citations

Affiliations

first authorsco-authorsvia INSPIRE