Figure 18

Figure 18: Evolutions of the head-on collisions of identical boson stars boosted toward each other with initial Lorentz factors γ as indicated. Time flows downward within each column and the top edge displays the axis of symmetry. The color-scale indicates the value of |ϕ |. In the middle frames one sees the interference pattern characteristic of high kinetic energy BS collisions (as mentioned in Figure 1). In the last column on the right, the collision produces a BH with apparent horizon indicated by the black oval in the third frame. Reprinted with permission from [55]; copyright by APS.