- #316

marcus

Science Advisor

Gold Member

Dearly Missed

- 24,770

- 791

here is post #302 on this thread

Bojowald removed the cosmological singularity in 2001, assuming isotropy. The result has since been extended to more general cases---post #301 has a link to a recent review.

Removing the black hole singularity is just happening this year, for the first time.

Just because the cosmological (BB) singularity was cured does not mean that the gravitational collapse (BH) singularity was cured.

In any given case the LQG analysis has to be done to see if the theory breaks down (and makes a singularity) or not. Including matter makes for some additional technical complications

========================

a new paper by Ashtekar was posted Tuesday 12 April

http://arxiv.org/abs/gr-qc/0504052

Semiclassical States for Constrained Systems

Abhay Ashtekar, Luca Bombelli, Alejandro Corichi

25 pages, 3 figures

just out

http://arxiv.org/abs/gr-qc/0503041

A black hole mass threshold from non-singular quantum gravitational collapse

Martin Bojowald, Rituparno Goswami, Roy Maartens, Parampreet Singh

4 pages, 3 figures

"Quantum gravity is expected to remove the classical singularity that arises as the end-state of gravitational collapse.To investigate this, we work with a simple toy model of a collapsing homogeneous scalar field. We show that non-perturbative semi-classical effects of Loop Quantum Gravity cause a bounce and remove the classical black hole singularity. Furthermore, we find a critical threshold scale, below which no horizon forms -- quantum gravity may exclude very small astrophysical black holes."

Bojowald removed the cosmological singularity in 2001, assuming isotropy. The result has since been extended to more general cases---post #301 has a link to a recent review.

Removing the black hole singularity is just happening this year, for the first time.

Just because the cosmological (BB) singularity was cured does not mean that the gravitational collapse (BH) singularity was cured.

In any given case the LQG analysis has to be done to see if the theory breaks down (and makes a singularity) or not. Including matter makes for some additional technical complications

========================

a new paper by Ashtekar was posted Tuesday 12 April

http://arxiv.org/abs/gr-qc/0504052

Semiclassical States for Constrained Systems

Abhay Ashtekar, Luca Bombelli, Alejandro Corichi

25 pages, 3 figures

Last edited: