- #1
PhysicsDilettante
- 11
- 0
I've been fascinated by the posts and discussions here about "The Bounce" that seems to be emerging from some LQG models (thanks Marcus and others). I have a couple of questions, which I don't think I've seen in posts here (my apologies if they've been raised and discussed and I've missed it).
The bounce seems to describe a contraction phase followed by an expansion phase that never goes through an infinitely dense point (or "singularity" which I understand is a model failure, and not something real).
I also understand that it is not really appropriate to equate what occurred in this extremely dense phase prior to the expansion that resulted in our current universe with what goes on in a black hole.
Nevertheless, I am curious as to whether any of those who are working in this field have speculated as to why we don't seem to see any expanding (exploding?) black holes among the billions that are now thought to be at the centers of galaxies. Do the LQG bounce models imply that under black hole conditions that there is a continuous, stable, pulsing cycle of contraction / expansion / contraction etc. of this very, very dense "stuff" that keeps black holes in place in a fairly confined space once they are formed?
And if that is the case, then I suppose the next obvious question is, when applying this process at the larger scale of the universe, what might explain the current expansion phase of our universe to have proceeded these last 13 odd billion years and allow for the much less dense stuff that is our universe today?
Thanks in advance,
Frank
The bounce seems to describe a contraction phase followed by an expansion phase that never goes through an infinitely dense point (or "singularity" which I understand is a model failure, and not something real).
I also understand that it is not really appropriate to equate what occurred in this extremely dense phase prior to the expansion that resulted in our current universe with what goes on in a black hole.
Nevertheless, I am curious as to whether any of those who are working in this field have speculated as to why we don't seem to see any expanding (exploding?) black holes among the billions that are now thought to be at the centers of galaxies. Do the LQG bounce models imply that under black hole conditions that there is a continuous, stable, pulsing cycle of contraction / expansion / contraction etc. of this very, very dense "stuff" that keeps black holes in place in a fairly confined space once they are formed?
And if that is the case, then I suppose the next obvious question is, when applying this process at the larger scale of the universe, what might explain the current expansion phase of our universe to have proceeded these last 13 odd billion years and allow for the much less dense stuff that is our universe today?
Thanks in advance,
Frank