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Imprint of the symmetry energy on the inner crust and strangeness content of neutron stars

  • Constança ProvidênciaEmail author
  • Sidney S. Avancini
  • Rafael Cavagnoli
  • Silvia Chiacchiera
  • Camille Ducoin
  • Fabrizio Grill
  • Jérôme Margueron
  • Débora P. Menezes
  • Aziz Rabhi
  • Isaac Vidaña
Regular Article - Theoretical Physics
Part of the following topical collections:
  1. Topical issue on Nuclear Symmetry Energy

Abstract

In this work we study the effect of the symmetry energy on several properties of neutron stars. First, we discuss its effect on the density, proton fraction and pressure of the neutron star crust-core transition. We show that whereas the first two quantities present a clear correlation with the slope parameter L of the symmetry energy, no satisfactory correlation is seen between the transition pressure and L . However, a linear combination of the slope and curvature parameters at ρ = 0.1 fm−3 is well correlated with the transition pressure. In the second part we analyze the effect of the symmetry energy on the pasta phase. It is shown that the size of the pasta clusters, number of nucleons and the cluster proton fraction depend on the density dependence of the symmetry energy: a small L gives rise to larger clusters. The influence of the equation of state at subsaturation densities on the extension of the inner crust of the neutron star is also discussed. Finally, the effect of the density dependence of the symmetry energy on the strangeness content of neutron stars is studied in the last part of the work. It is found that charged (neutral) hyperons appear at smaller (larger) densities for smaller values of the slope parameter L. A linear correlation between the radius and the strangeness content of a star with a fixed mass is also found.

Keywords

Neutron Star Nuclear Matter Symmetry Energy Transition Pressure Symmetric Nuclear Matter 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© SIF, Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Constança Providência
    • 1
    Email author
  • Sidney S. Avancini
    • 2
  • Rafael Cavagnoli
    • 3
  • Silvia Chiacchiera
    • 1
  • Camille Ducoin
    • 4
  • Fabrizio Grill
    • 1
  • Jérôme Margueron
    • 4
  • Débora P. Menezes
    • 2
  • Aziz Rabhi
    • 1
  • Isaac Vidaña
    • 1
  1. 1.Centro de Física Computacional, Department of PhysicsUniversity of CoimbraCoimbraPortugal
  2. 2.Departamento de FísicaUniversidade Federal de Santa CatarinaFlorianópolisBrazil
  3. 3.Departamento de FísicaUniversidade Federal de PelotasPelotas/SCBrazil
  4. 4.Institut de Physique Nucléaire de LyonUniversité Claude Bernard Lyon 1VilleurbanneFrance

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