Electron screening effects on crustal torsional oscillations
arXiv:1401.6977 · doi:10.1016/j.physletb.2014.01.054
Abstract
We systematically examine the crustal torsional oscillations as varying the stellar mass and radius, where we take into account the effect of electron screening due to the inhomogeneity of electron distribution. In the examinations, we adopt two different equations of state (EOSs) for the inner crust region of neutron stars. As a result, we find that the frequencies depend obviously on the EOS, even if the neutron star models are almost independent of the EOS. That is, one could solve the degeneracy of the stellar models with different EOS via the observations of shear oscillations frequencies. Additionally, we find that the fundamental frequencies of the -th order torsional oscillations can reduce 6% due to the effect of electron screening, which is independent of the adopted EOS and stellar models. This reduction of frequencies can be crucial to make a constraints on the density dependence of the nuclear symmetry energy, , i.e., the constraint on can reduce ~15% by the electron screening effect.
accepted for publication in PLB
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- Scalar gravitational waves from relativistic stars in scalar-tensor gravity
- Stellar oscillations in Eddington-inspired Born-Infeld gravity
- Torsional oscillations of neutron stars in scalar-tensor theory of gravity
- Probing crustal structures from neutron star compactness
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- Quark matter with strong magnetic field and possibility of the third family of compact stars