shedding light on the eos-gravity degeneracy and constraining the nuclear symmetry energy from the gravitational binding energy of neutron stars
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2016
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Abstract
A thorough understanding of properties of neutron stars requires both a reliable knowledge of the equation of state (EOS) of super-dense nuclear matter and the strong-field gravity theories simultaneously. To provide information that may help break this EOS-gravity degeneracy, we investigate effects of nuclear symmetry energy on the gravitational binding energy of neutron stars within GR and the scalar-tensor subset of alternative gravity models. We focus on effects of the slope L of nuclear symmetry energy at saturation density and the high-density behavior of nuclear symmetry energy. We find that the variation of either the density slope L or the high-density behavior of nuclear symmetry energy leads to large changes in the binding energy of neutron stars. The difference in predictions using the GR and the scalar-tensor theory appears only for massive neutron stars, and even then is significantly smaller than the difference resulting from variations in the symmetry energy.
| Reference Key |
xiao-tao2016epjshedding
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|---|---|
| Authors | ;He Xiao-Tao;Fattoyev F. J.;Li Bao-An;Newton W. G. |
| Journal | utilitas mathematica |
| Year | 2016 |
| DOI |
10.1051/epjconf/201610907002
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