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Astrophysical signatures of boson stars: quasinormal modes and inspiral resonances
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Compact bosonic field configurations, or boson stars, are promising dark matter candidates which have been invoked as an alternative description for the supermassive compact objects in active galactic nuclei. Boson stars can be comparable in size and mass to supermassive black holes and they are hard to distinguish by electromagnetic observations. However, boson stars do not possess an event horizon and their global spacetime structure is different from that of a black hole. This leaves a characteristic imprint in the gravitational-wave emission, which can be used as a discriminant between black holes and other horizonless compact objects. Here we perform a detailed study of boson stars and their gravitational-wave signatures in a fully relativistic setting, a study which was lacking in the existing literature in many respects. We construct several fully relativistic boson star configurations, and we analyze their geodesic structure and free oscillation spectra, or quasinormal modes. We explore the gravitational and scalar response of boson star spacetimes to an inspiralling stellar-mass object and compare it to its black hole counterpart. We find that a generic signature of compact boson stars is the resonant-mode excitation by a small compact object on stable quasi-circular geodesic motion.
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Cited by 12 Pith papers
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For excited boson stars, the first zero of the fundamental radial mode matches the first critical point of mass, charge, and binding energy for all tested node numbers and self-interactions.
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Bifurcations in Bosonic Stars: chains and rings from spherical solutions
Zero-modes of spherical bosonic stars under axisymmetric perturbations explain the bifurcations into chain, ring, and gyroscope-like bosonic star families.
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Bound orbits near scalar field naked singularities
In scalar field naked singularities the lapse function has a global minimum, creating a stable static orbit for zero-angular-momentum particles that can mimic a black hole shadow, and nearby bound orbits precess backwards.
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Broadened Lensing Rings of Compact Boson Stars: Enhanced Imprint of Accretion Flow in Images and Visibilities
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Scalarization of Bardeen spacetime
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Light Rings, Accretion Disks and Shadows of Hayward Boson Stars
Numerical construction of Hayward boson stars shows that frozen states produce Schwarzschild-like shadows with no extra photon rings while non-frozen states show multiple photon rings inside the shadow.
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Constraints on the binary black hole nature of GW151226 and GW170608 from the measurement of spin-induced quadrupole moments
A new Bayesian test of the spin-induced quadrupole moment finds GW151226 and GW170608 consistent with binary black holes, though the 90 percent bounds are wide and Bayes factors inconclusive.
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Hayward Boson Stars
Hayward boson stars exist only when sqrt(beta)/Q > 1.49661, exactly where the vacuum Hayward spacetime has no horizon.
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