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

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

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 f...

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Veröffentlicht in:Physical review letters 2012-05, Vol.108 (20), p.201101-201101, Article 201101
Hauptverfasser: Sotani, Hajime, Nakazato, Ken'ichiro, Iida, Kei, Oyamatsu, Kazuhiro
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creator Sotani, Hajime
Nakazato, Ken'ichiro
Iida, Kei
Oyamatsu, Kazuhiro
description 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≃50  MeV.
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title Probing the equation of state of nuclear matter via neutron star asteroseismology
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