Light rings and light points of boson stars
Résumé
This work is devoted to the study of photon trajectories around rotating boson stars. The basic properties of boson star models are given with a particular emphasis on the high compactness those objects can have. Using an effective potential method, circular orbits of photon around rotating boson stars are then obtained, at least for relativistic enough configurations. A particular class of light rings is exhibited, where the photons are at rest. It is proposed to call those orbits light points. Their existence is only possible for very specific boson stars and the link between light points and ergoregions is investigated.
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