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Nuclear Theory·nucl-th

Thursday·June 4, 2020

8 papers—6 primary·2 cross-listed

All8Primary6Cross-lists2
  1. 07

    [Submitted on 29 May 2020] (cross-list from astro-ph.HE)

    On the minimum radius of very massive neutron stars

    Sophia Han🇺🇸 · Madappa Prakash🇺🇸

    Prospects of establishing the radii of massive neutron stars in PSR J1614-2230 and PSR J0740+6620 from NICER and Chandra observatories hold the potential to constrain the equation of state (EoS) of matter to densities well beyond those encountered in canonical stars of mass . In this work, we investigate the relation between the radii of very massive neutron stars up to the maximum mass, , supported by dense matter EoSs. Results from models with hadronic matter are contrasted with those that include a first-order hadron-to-quark phase transition. We find that a lower bound on with an upper bound on the radius of massive pulsars serves to rule out too soft quark matter, and an upper bound on with a lower bound on the radius of massive pulsars strongly disfavors a transition into too-stiff quark matter appearing at low densities. The complementary role played by radius inferences from future gravitational wave events of inspiraling binary neutron stars is also briefly discussed.

    Comments:
    15 pages, 10 figures, 3 tables; discussions and references added
    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); Solar and Stellar Astrophysics (astro-ph.SR); Nuclear Theory (nucl-th)
    arXiv:
    2006.02207 [pdf]
    ApJ(2020)·56 citations
  2. 08

    [Submitted on 3 Jun 2020] (cross-list from hep-ph)

    Pion observables calculated in Minkowski and Euclidean spaces with Ansätze for quark propagators

    Dalibor Kekez🇭🇷 · Dubravko Klabučar🇭🇷

    We study two quark--propagator meromorphic Ansätze that admit clear connection between calculations in Euclidean space and Minkowski spacetime. The connection is established through a modified Wick rotation in momentum space, where the integration contour along the imaginary axis is adequately deformed. The Ansätze were previously proposed in the literature and fitted to Euclidean lattice QCD data. The generalized impulse approximation is used to calculate the pion transition form factor and electromagnetic form factor, correcting an earlier result. The pion decay constant and distribution amplitude are also calculated. The latter is used to deduce the asymptotic behavior of the form factors. Such an asymptotic behavior is compared with those obtained directly from the generalized impulse approximation and the causes of differences are pointed out.

    Comments:
    16 pages, 8 eps figures, uses revtex4-2, title changed, text improved, matching published version
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2006.02326 [pdf]
    PRD(2023)·5 citations

Affiliations

first authorsco-authorsvia INSPIRE