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