Abstract
We study equilibrium configurations of boson stars in the framework of a class scalar-tensor theories of gravity with a massive gravitational scalar (dilaton). In particular we investigate the influence of the mass of the dilaton on the boson star structure. We find that the masses of the boson stars in the presence of a dilaton are close to those in general relativity and they are sensitive to the ratio of the boson mass to the dilaton mass within typically a few percent. It turns out also that the boson star structure is mainly sensitive to the mass term of the dilaton potential rather than the exact form of the potential.
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