Comparing timelike geodesics around a Kerr black hole and a boson star
Comparing timelike geodesics around a Kerr black hole and a boson star
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DOI：
10.1088/1361-6382/aa8d39
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发表时间：
2017-09
影响因子：
3.5
通讯作者：
M. Grould;Z. Meliani;F. Vincent;P. Grandcl'ement;E. Gourgoulhon
中科院分区：
文献类型：
--
作者：
M. Grould;Z. Meliani;F. Vincent;P. Grandcl'ement;E. Gourgoulhon
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 μas. 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 ≲30M. 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.
