Figure 18: Evolutions of the head-on collisions of identical boson stars boosted toward each other
with initial Lorentz factors as indicated. Time flows downward within each column and the top
edge displays the axis of symmetry. The color-scale indicates the value of . 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.
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