They, therefore, numerically collide boson stars head-on at relativistic energies to study black-hole
formation from just such dynamical “squeezing”. Here, the nature of boson stars is largely irrelevant as they
serve as simple bundles of energy that can be accelerated (see Figure 18). However, unlike using
boosted black-hole solutions, the choice of boson stars avoids any type of bias or predisposition to
formation of a black hole. In addition, a number of previous studies of boson star head-on
collisions showed interesting interference effects at energies below the threshold for black-hole
formation [49, 51, 141, 167]. Indeed, it has been proposed that such an interference pattern could be
evidence for the bosonic nature of dark matter because of evidence that an ideal fluid fails to produce such
a pattern [95].
Choptuik and Pretorius [55] find that indeed black-hole formation occurs at energies below that estimated by the Hoop Conjecture. This result is only a classical result consistent with the conjecture, but if it had not held, then there would have been no reason to expect a quantum theory to be consistent with it.
http://www.livingreviews.org/lrr-2012-6 |
Living Rev. Relativity 15, (2012), 6
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