Universal relations for rotating Boson Stars

Abstract

Boson stars represent a hypothetical exotic type of compact stellar object that may be observed from the gravitational signal of coalescing binaries in current and future GW detectors. In this work we show that the moment of inertia $I$, the (dimensionless) angular momentum $\chi$ and the quadrupole moment $Q$ of rotating boson stars obey a universal relation, valid for a wide set of boson star models. Further, the obtained $I-\chi -Q$ relation clearly differs from its famous neutron star counterpart, providing us with an unequivocal diagnostic tool to distinguish boson stars from ordinary compact stars or other celestial bodies in GW observations. Such universal (i.e. model-independent) relations also provide a useful tool to probe the strong gravity regime of general relativity and to constrain the equation of state of matter inside compact stars.

12 pages, 20 figures. In this current version, we have changed the format and the Appendix

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• Generic initial data for binary boson stars
• Gravitational-Wave Constraints on Neutron-Star Pressure Anisotropy via Universal Relations
• Ergoregion instability in bosonic stars: scalar mode structure, universality, and weakly nonlinear effects
• Slowly Rotating Boson Stars
• The Resurgence of the G(2) Group for the Strong Sector and the Emergence of Dark Matter