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Comparing timelike geodesics around a Kerr black hole and a boson star
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abstract
The second-generation beam combiner at the Very Large Telescope (VLT), GRAVITY, observes the stars orbiting the compact object located at the center of our galaxy, with an unprecedented astrometric accuracy of 10 $\mu$as. The nature of this compact source is still unknown since black holes are not the only candidates explaining the four million solar masses at the Galactic center. Boson stars are such an alternative model to black holes. This paper focuses on the study of trajectories of stars orbiting a boson star and a Kerr black hole. We put in light strong differences between orbits obtained in both metrics when considering stars with sufficiently close pericenters to the compact object, typically $\lesssim 30~M$. Discovery of closer stars to the Galactic center than the S2 star by the GRAVITY instrument would thus be a powerful tool to possibly constrain the nature of the central source.
Forward citations
Cited by 3 Pith papers
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Topological charge and black hole photon spheres in massive gravity
In dRGT massive gravity, static spherically symmetric black holes exhibit zero, one, or two photon spheres whose topological charges and stability patterns differ from Einstein gravity and from horizonless compact objects.
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A new type of multi-branch periodic orbits in dyonic black holes
Dyonic black holes with non-monotonic metric functions support multiple geometrically distinct but topologically identical periodic orbits for the same rational label, plus bound orbits with energy above unity.
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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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