Reality Conditions

Tuesday, April 11, 2006

Gravitons from LQG

A paper that seems groundbreaking in Loop Quantum Gravity has appeared today:

Graviton propagator in loop quantum gravity
Authors: Eugenio Bianchi, Leonardo Modesto, Carlo Rovelli, Simone Speziale

They claim to compute some components of the graviton propagator from LQG. If the calculation is solid then this makes a big step towards the main problem haunting LQG, the mysterious low energy limit of the theory. I haven't read yet most of the paper, but the list of open issues in the conclusions is huge, so there is still a lot of work to be done.

I make the following predictions: a) Christine will link to the paper in the following hours; b) Lubos will do the same, perhaps a bit later, with a long explanation on how this paper and the whole of LQG are wrong, unphysical, pseudo-scientific, and perhaps even liberal and pro-global warming; c) perhaps Peter will link to it also, even later, gleefully commenting that LQG is doing more progress than string theory and that Lubos is becoming crazy becasue of that.


  • You were right about Christine, I don't think Peter has liniked yet and I haven't checked out Lubos.

    Over at Physicsforums they're running a poll/contest on the most influential paper of the current siz months or so. This one looks like a natural candidate, since it's got LQG legs (Rovelli) and talks in a manner that string theorists can relate to.

    By Anonymous Dick Thompson, at 9:28 PM, April 11, 2006  

  • Well, one day later and Lubos and Peter have still not reacted, so perhaps my prediction was too rash. A hit and miss thing, this prophesizing business.

    By Blogger Alejandro, at 11:24 AM, April 12, 2006  

  • lubos responded as you predicted
    (and as you just pointed out)
    congratulations on 2 out of 3

    Peter would probably have behaved properly but he was put out of kilter by Africa trip to watch the eclipse.
    still not quite back to normal

    By Anonymous Marcus, at 8:24 PM, April 17, 2006  

  • I had a lot fun of your predictions. Thx!

    By Anonymous Wan, at 12:42 AM, May 28, 2006  

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