- #36
zhermes
- 1,255
- 3
It was specifically in reference to your comment that:
But going back to the initial point; the event horizon can definitely form stably. We agree that the singularity itself is completely questionable---so that part doesn't really matter. My overall argument is that we are really really confident event horizons can form; and quantum mechanics (string theory etc etc) only suggest GR breaks something like 50 orders of magnitude closer to the center of the BH than the event horizon... so there doesn't seem to be a reason to expect GR to break near the EH...
(Unless you're looking at a near-extremal kerr black-hole---which we believe exist---in which case the singularity itself can be very near the event horizon.
Those studies have shown singularity formation in finite coordinate (and proper) time---but you're right, I'm not sure exactly how long (but I think its on the order of a dynamical time), and in how diverse situations; good keeping me on my toes.Chalnoth said:That is, the time dilation may be so severe that the matter inside the event horizon just doesn't have enough time to collapse any significant amount before the black hole evaporates.
But going back to the initial point; the event horizon can definitely form stably. We agree that the singularity itself is completely questionable---so that part doesn't really matter. My overall argument is that we are really really confident event horizons can form; and quantum mechanics (string theory etc etc) only suggest GR breaks something like 50 orders of magnitude closer to the center of the BH than the event horizon... so there doesn't seem to be a reason to expect GR to break near the EH...
(Unless you're looking at a near-extremal kerr black-hole---which we believe exist---in which case the singularity itself can be very near the event horizon.