Probing the equation of state of nuclear matter via neutron star asteroseismology

Hajime Sotani, Ken'ichiro Nakazato, Kei Iida, Kazuhiro Oyamatsu

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58 Citations (Scopus)

Abstract

We general-relativistically calculate the frequency of fundamental torsional oscillations of neutron star crusts, where we focus on the crystalline properties obtained from macroscopic nuclear models in a way that is dependent on the equation of state of nuclear matter. We find that the calculated frequency is sensitive to the density dependence of the symmetry energy, but almost independent of the incompressibility of symmetric nuclear matter. By identifying the lowest-frequency quasiperiodic oscillation in giant flares observed from soft gamma-ray repeaters as the fundamental torsional mode and allowing for the dependence of the calculated frequency on stellar models, we provide a lower limit of the density derivative of the symmetry energy as L 50MeV.

Original languageEnglish
Article number201101
JournalPhysical Review Letters
Volume108
Issue number20
DOIs
Publication statusPublished - May 18 2012

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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