Kavli Affiliate: Lijing Shao
| First 5 Authors: Zexin Hu, Yong Gao, Lijing Shao, ,
| Summary:
Neutron stars (NSs) are excellent laboratories for testing gravity theories
as they are strongly self-gravitating bodies and have rich observational
phenomena. However, strong-gravity effects in NS could be degenerate with their
equation of state (EOS) which is largely unknown. Fortunately, there exist the
so-called universal relations among the NS macroscopic quantities that are
found to be insensitive to the underlying EOS. Studying the origin of these
relations can lead to a better understanding of NSs and the gravitational
interaction. We develop a new perspective of view to analyze the I-C and I-Love
universal relations for NSs. At the linear order, we separate the deviation of
the universal relations into two parts, where one is the EOS perturbation while
the other only depends on the background star structures. The smallness of the
second part fully determines the universality of the relation irrespective of
the form of the first part. We discuss the validity of our linear approximation
when considering the difference among realistic EOSs. Our study can be regarded
as a new frame for quantitative representation of the universality and may
provide new insights to the universal relations of NSs.
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