[aruggirello]

I'm confused here. The mere existence of an event horizon - albeit a temporary one - should make a black hole! So "More specifically, we find that collapsing stars slow down their collapse right outside their horizon," by implying that a horizon DOES exist, simply doesn't cut it. Am I missing something?

[scott_s]

I believe that's using the concept of a horizon. For an object of a particular mass, we can use our theory to tell us where the event horizon would be, if it collapses past that point. My understanding of this recent paper is that they are saying: it won't collapse past that point.