Recent content by Urs

Oh, looks like I temporarily confused the title of this thread with another thread! So let me rather point out that on sps we are currently also trying to demonstrate to popular science journalist Ruediger Vaas that string theory has a much nicer way to 'get spacetime a posteriori' than LQG...

Hi Eric, great to hear from you! You wrote: Yes, but we are being told that it probably appears this week, maybe next week. There is not a lot of traffic at the moment at s.p.s, so you are not missing much if you cannot access a newsserver (though most newsserves should serve s.p.s...

Now Bert Schroer has joined the discussion on Pohlmeyer invariants: http://golem.ph.utexas.edu/string/archives/000338.html#c000881

If you do want to chat with R. Vaas, just post a message to the Coffee Table. I did point him to the discussion here, but he tells me that limited time only allows him to participate in a limited number of forums. BTW, maybe it would help if there were less of 'growl, growl' and related stuff...

We are now discussing R. Vaas' article over at the Coffee Table: http://golem.ph.utexas.edu/string/archives/000330.html#c000867 . Regarding Loops and Schleifen: Contemporary german language makes heavy and sometimes even insane use of english words. The situation here is completely...

Here are some links to papers that discuss attempts to derive non-perturbative phenomonology (like 4-d spacetime) from stringy matrix models: http://golem.ph.utexas.edu/string/archives/000314.html#c000863

As far as I can see research on Matrix Models is hampered by the fact that it is - difficult! :-) When you hear the Potsdam group, Nicolai et al., speak about their reserach in supermembrane/BFSS model, you'll note that they will tell you that after fascinating results to lowest order...

Concerning Matrix Models, since they are non-perturbative, there is no need to pick any background. They pick their own solutions. That's what the papers that I was referring to tried to compute, namely the (maybe unique?) solution of the IKKT model. Of course it hasn't been done yet, obviously...

Hi Peter Woit - one question: Did I understand you correctly that you reject the Matrix Models of string theory as a viable nonperturbative definition for the reason that they, as I think you said, don't give four large dimensions only? I think I have read that somewhere on your weblog...

Thanks. I have now also included a few photographs. See here (you have to scroll down a little).

Marcus - it may well be that the 'LQG-string' doesn't receive much attention among LQGists. But I am getting the impression that the problems that this paper highlighted should receive more attention. In my humble opinion the free 1d nonrel particle discussed by Willis et al. is so...

This 'copy and paste' is a fun game! :-) I can even provide you with spr messages that haven't even appeared yet ! ;-) ------------ "Josh Willis" <jwillis@gravity.psu.edu> schrieb I am Newsbeitrag news:c3goq8$18le$1@f04n12.cac.psu.edu... > (1) Poisson brackets go over to...

K.-H. Rehren now agrees with my assertion that, as opposed to what it says in Bahn's thesis, the DDF invariants do NOT require fixing any worldsheet gauge. For more details of definitely the very latest from the field of Pohlmeyer invarians see here :-)

Following the report on A. Ashtekar comments on the 'LQG-string', here is now the summary of an interview with H. Nicolai on LQG, anomalies and all that.

The latest news from my quest to understand LQG can be found here.