Spherical Boson Stars as Black Hole mimickers

Francisco Siddhartha Guzman

Spherically symmetric boson stars are presented as black hole mimickers based on the power spectrum of a simple accretion disk model and show the advantages of boson stars over other black hole mimickers. The free parameters of the boson star are the mass of the boson and the fourth order self-interaction coefficient in the scalar field potential. We show that if the mass of the boson is the only free parameter of boson star solutions, it is possible to find a boson star configuration that supplants the power spectrum of the disk due to a black hole of the same mass of the boson star mimicker. We also show that for each value of the self-interaction a single boson star configuration can mimic a black hole at very different astrophysical scales in terms of the mass of the black hole candidate and the accretion rate. In order to show that it is possible to distinguish one of our mimickers from a black hole we study the deflection of light and the propagation of waves on top of boson star and black hole space-times.