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marcus
#9
Apr2-07, 09:45 AM
Astronomy
Sci Advisor
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P: 23,232
Hello Ravi, welcome to PF

since you are interested in LQG (which these days covers a variety of different but related approaches to quantum geometry/quantum gravity/cosmology) let me mention a few things happening in the field

Earlier this year there was an important workshop (The Quantum Nature of Spacetime Singularities) at the Kavli ITP at Santa Barbara. It went on for the better part of 3 weeks and video of the main talks is available on line. Abhay Ashtekar was there and a member of his group at Penn State, Martin Bojowald, was a co-organizer of the workshop.

I think it is fairly obvious that the LQG-community (particularly those doing the cosmology spin-off LQC) are at the forefront in dealing with the big bang and black hole singularities, and some of the string-community are evidently interested in trying to understand what's going on in that area. Hence setting up the workshop and inviting major LQG-community people.

You may be interested purely in the theory, and not in the activities of the people, which is fine. But if you are interested in the current LQG "scene", then we could share news and notes.

Another defining event for the LQG-community this year is the two-week school now in progress in Poland. It is called QGQG-1.
"The first quantum gravity quantum geometry school"
A series of 8 or 9 lectures on LQG proper is being given by Thomas Thiemann. There are other series of lectures on related but different approaches.

Another defining event was the European Science Foundation (ESF) setting up last year the QGQG network, which funds such things as this QGQG school and workshops and conferences.
the distinguishing thing about the LQG-community research is the quantum geometrical approach to gravity. Instead of a graviton or something else moving in a fixed background geometry, the geometric ambience is itself a dynamic entity (as in GR itself). So saying QGQG is a way of evoking background independent, non-perturbative, largely non-string approaches to QG. So the ESF is recognizing this and putting money into it.

Another definining event for the LQG-community will be the publication this year (if it goes as planned) by Cambridge U. Press of the book edited by Dan Oriti called "Approaches to Quantum Gravity, Towards a New Understanding of Space Time and Matter".
there are 10 - 20 authors involved, mainly from the LQG-community. Quite a number of different approaches represented.

We have discussion-threads about some of these happenings here at "Beyond" forum. Hope you will contribute your own thoughts or news items. Again welcome.