Paper on the Singularity Resolution in Quantum Gravity?

[ranyart]

There has been an increase in the resolution of 'singularities'and the problems it brings.

here is a link to a very "average" paper at present. The authors(no relation to ''Jeff'' I hope! seem to be grasping in the dark?

Nevertheless, issue's are trying to be tackled from a number of interesting viewpoints, I am not being unreasonably here in my overview of the Paper or its authors, but it does appear to be a brave step, wether it turns out to be a step forward is another thing.

The authors appear to be from the "smolin school of exelance" Perimiter Institute.

http://uk.arxiv.org/PS_cache/gr-qc/pdf/0312/0312094.pdf

 

[marcus]

This seems like a valuable paper. Thanks for the link!
Here is the abstract in case anyone wants to look
at that before downloading the PDF.

http://arxiv.org/gr-qc/0312094

As I see it the main thing this paper does is corroborate
Bojowald's results and make them more reliable.
I guess the word is "robust"

Bojowald showed if you use the connection variable approach
of Loop gravity and quantize the standard classical model of
cosmology, then the Big Bang singularity goes away.

This result has attracted a lot of attention over the past 3 years
and several other authors have confirmed it using basically the
same (Loop) approach.

But one can ask "Does this depend on using the connection variables
(the Ashtekar new variables for GR) or would it also work using
the earlier ADM variables?"

How tough and adaptible is the no-BB-singularity result? Will it carry over to different styles of formalism, different quantizations of different classical models? Does removing the BB singularity work in other quantizations of GR, or only in Loop?

These people (Viqar Husain and Oliver Winkler) asked this natural question and went and tried it. And indeed the no-singularity result turned out to be robust!

This does not mean that one would want to go back to using the metric, or go back to 1960-1970 (geo) metric dynamics. The connection variables approach seems more convenient. But it means one can place additional reliance on Bojowald's results. this is neat! Glad to see this paper ranyart, thanks again!

 

[R0man]

First of all, I would like to commend the authors for taking on such a complex and challenging topic as the singularity resolution in quantum gravity. It is certainly a topic that has been of great interest and debate among physicists for decades.

After reading the paper, it is clear that the authors have put a lot of effort into trying to understand and tackle the issues surrounding singularities. The paper presents a comprehensive overview of the different viewpoints and approaches that have been taken in attempting to resolve singularities, from the traditional general relativity approach to the more recent quantum gravity theories.

However, I must agree with the author's assessment that their paper is "average" at best. While it does provide a good summary of the current state of research on the topic, it does not offer any groundbreaking insights or new approaches. It seems that the authors are simply summarizing the work of others without adding much of their own contribution.

Furthermore, the paper seems to be lacking in terms of providing a clear and cohesive argument or conclusion. It feels like the authors are grasping at different ideas and theories without fully exploring or understanding them. This could be due to the complexity of the topic, but it does leave the reader with a sense of uncertainty and lack of direction.

Overall, I appreciate the efforts of the authors in trying to shed light on the singularity resolution in quantum gravity, but I agree that more work needs to be done in this area. I hope that future research will provide more concrete and innovative solutions to this long-standing problem in physics.