%0 Journal Article %T Uniqueness of the static spacetimes with a photon sphere in Einstein-scalar field theory %A Stoytcho S. Yazadjiev %J Physics %D 2015 %I arXiv %X In the present paper we prove a uniqueness theorem for the static and asymptotically flat solutions to the Einstein-scalar field equations which possess a photon sphere. We show that such solutions are uniquely specified by their mass $M$ and scalar charge $q$ and that they are isometric to the Janis-Newman-Winicour solution with the same mass and scalar charge subject to the inequality $\frac{q^2}{M^2}<3$. %U http://arxiv.org/abs/1501.06837v1