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marcus

Science Advisor

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## Main Question or Discussion Point

Martin Bojowald got rid of the Bigbang singularity in 2001 while

at Penn State----on postdoc working for Ashtekar. Now he is at the Albert Einstein Institute in Germany.

This year he has been working on getting rid of the Blackhole singularity and has posted one or two preliminary papers.

Now Ashtekar has announced two BH papers, co-authored with Bojowald, in preprint form but not posted at arxiv. Ashtekar has given some sketchy indications of the results. Maybe we should write Ashtekar or Bojowald and ask for the preprints. Or maybe the thing to do is just wait patiently. At least one of the papers is about what is down inside the blackhole instead of a classical singularity. A quantum "ex-singularity".

look at the two references at top of page 37 of

http://arxiv.org/abs/gr-qc/0410054

which are

[49] Ashtekar A and Bojowald M 2004

[50] Ashtekar A and Bojowald M 2004

Ashtekar addresses the problem of BH information loss, which was arrived at based on semiclassical ideas. and he says:

---quote from bottom of page 30---

However, loop quantum gravity considerations suggest that this argument is incorrect in two respects. First, the semi-classical picture breaks down not just at the end point of evaporation but in fact all along what is depicted as the final singularity. Recently, using ideas from quantum cosmology, the interior of the Schwarzschild horizon was analyzed in the context of loop quantum gravity. Again, it was found that the singularity is resolved due to quantum geometry effects [49]. Thus, the space-time does not have a singularity as its final boundary...

---quote---

at Penn State----on postdoc working for Ashtekar. Now he is at the Albert Einstein Institute in Germany.

This year he has been working on getting rid of the Blackhole singularity and has posted one or two preliminary papers.

Now Ashtekar has announced two BH papers, co-authored with Bojowald, in preprint form but not posted at arxiv. Ashtekar has given some sketchy indications of the results. Maybe we should write Ashtekar or Bojowald and ask for the preprints. Or maybe the thing to do is just wait patiently. At least one of the papers is about what is down inside the blackhole instead of a classical singularity. A quantum "ex-singularity".

look at the two references at top of page 37 of

http://arxiv.org/abs/gr-qc/0410054

which are

[49] Ashtekar A and Bojowald M 2004

**Non-Singular Quantum Geometry of the Schwarzschild Black Hole Interior**Preprint[50] Ashtekar A and Bojowald M 2004

**Black hole evaporation: A paradigm**PreprintAshtekar addresses the problem of BH information loss, which was arrived at based on semiclassical ideas. and he says:

---quote from bottom of page 30---

However, loop quantum gravity considerations suggest that this argument is incorrect in two respects. First, the semi-classical picture breaks down not just at the end point of evaporation but in fact all along what is depicted as the final singularity. Recently, using ideas from quantum cosmology, the interior of the Schwarzschild horizon was analyzed in the context of loop quantum gravity. Again, it was found that the singularity is resolved due to quantum geometry effects [49]. Thus, the space-time does not have a singularity as its final boundary...

---quote---