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Nuclear Theory·nucl-th

Wednesday·August 3, 2016

5 papers—3 primary·2 cross-listed

All5Primary3Cross-lists2
  1. 04

    Compact stars with strongly coupled quark matter in a strong magnetic field

    D. A. Fogaça🇧🇷 · S. M. Sanches Jr.🇧🇷 · T. F. Motta🇧🇷 · F. S. Navarra🇧🇷

    Some time ago we have derived from the QCD Lagrangian an equation of state (EOS) for the cold quark matter, which can be considered an improved version of the MIT bag model EOS. Compared to the latter, our equation of state reaches higher values of the pressure at comparable baryon densities. This feature is due to perturbative corrections and also to non-perturbative effects. Later we applied this EOS to the study of compact stars, discussing the absolute stability of quark matter and computing the mass-radius relation for self-bound (strange) stars. We found maximum masses of the sequences with more than two solar masses, in agreement with the recent experimental observations. In the present work we include the magnetic field in the equation of state and study how it changes the stability conditions and the mass-radius curves.

    ↳ hep-phastro-ph.HEnucl-thPRC(2016)·9 citations
  2. 05

    Effect of temperature and magnetic field on two-flavor superconducting quark matter

    Tanumoy Mandal🇸🇪 · Prashanth Jaikumar🇺🇸

    We investigate the effect of turning on temperature for the charge neutral phase of two-flavor color superconducting (2SC) dense quark matter in presence of constant external magnetic field. Within the Nambu-Jona-Lasinio model, by tuning the diquark coupling strength, we study the interdependent evolution of the quark Bardeen-Cooper-Schrieffer gap and dynamical mass as functions of temperature and magnetic field. We find that magnetic field GeV ( G) leads to anomalous temperature behavior of the gap in the gapless 2SC phase (moderately strong coupling), reminiscent of previous results in the literature found in the limit of weak coupling without magnetic field. The 2SC gap in the strong coupling regime is abruptly quenched at ultrahigh magnetic field due to the mismatched Fermi surfaces of up and down quarks imposed by charge neutrality and oscillation of the gap due to Landau level quantization. The dynamical quark mass also displays strong oscillation and magnetic catalysis at high magnetic field, although the latter effect is tempered by nonzero temperature. We discuss the implications for newly born compact stars with superconducting quark cores.

    ↳ hep-phnucl-thPRD(2016)·15 citations

Affiliations

first authorsco-authorsvia INSPIRE