Figure 17

Figure 17: Evolution of a boson star (solid line) perturbed by a shell of scalar field (dashed line). Shown is the mass density ∂M ∕ ∂r for each contribution. By t ≈ 100 the real scalar field pulse has departed the central region and perturbed the boson star into an unstable, compact configuration. Contrast the t = 0 frame with that of t = 97.5 and note the increase in compaction. This unstable BS survives until t ≈ 500 only because the initial perturbation has been tuned to one part in 15 10 and indicates Type I critical behavior. Reprinted with permission from [142].