Black holes with scalar fields

Combining analytic with numerical work, black-hole solutions with scalar fields will be studied. Time evolutions of single-black-hole solutions obtained from the Einstein equations coupled to the Klein-Gordon equations will be analysed and the results compared with approximation calculations. The stability of the spacetimes will be explored through studying different types of initial perturbations superposed onto the initial black-hole solution. The emission of gravitational and scalar radiation will be computed.