Hyat Huang, Burkhard Kleihaus, Jutta Kunz, Meng-Yun Lai, Eugen Radu, De-Cheng Zou
In scalar-tensor theories, compact objects may experience spontaneous scalarization. Recently, it was shown that matter-induced spontaneous scalarization of neutron stars is predominantly associated with a first-order phase transition. Here we consider matter-induced spontaneous scalarization of boson stars. Employing a repulsive quartic potential for the bosonic matter, we find only first-order phase transitions.