Abstract.
A set of theoretical mass-radius relations for rigidly rotating neutron stars with exotic cores, obtained in various theories of dense matter, is reviewed. Two basic observational constraints are used: the largest measured rotation frequency (716Hz) and the maximum measured mass ( 2M ⊙ . The present status of measuring the radii of neutron stars is described. The theory of rigidly rotating stars in general relativity is reviewed and limitations of the slow rotation approximation are pointed out. Mass-radius relations for rotating neutron stars with hyperon and quark cores are illustrated using several models. Problems related to the non-uniqueness of the crust-core matching are mentioned. Limits on rigid rotation resulting from the mass-shedding instability and the instability with respect to the axisymmetric perturbations are summarized. The problem of instabilities and of the back-bending phenomenon are discussed in detail. Metastability and instability of a neutron star core in the case of a first-order phase transition, both between pure phases, and into a mixed-phase state, are reviewed. The case of two disjoint families (branches) of rotating neutron stars is discussed and generic features of neutron-star families and of core-quakes triggered by the instabilities are considered.
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Contribution to the Topical Issue on “Exotic matter in neutron stars” edited by David Blaschke, J¨urgen Schaffner-Bielich, Hans-Josef Schulze.
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Haensel, P., Bejger, M., Fortin, M. et al. Rotating neutron stars with exotic cores: masses, radii, stability. Eur. Phys. J. A 52, 59 (2016). https://doi.org/10.1140/epja/i2016-16059-4
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DOI: https://doi.org/10.1140/epja/i2016-16059-4