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Spin foam phase space, classical action (Wieland's talk is online)

  1. Sep 17, 2014 #1

    marcus

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    Wieland gave his ILQGS talk yesterday, 16 September. Audio and slides are on line.

    Title: Covariant loop quantum gravity: Its classical action, phase space and gauge symmetries
    http://relativity.phys.lsu.edu/ilqgs/wieland091614.pdf
    http://relativity.phys.lsu.edu/ilqgs/wieland091614.wav

    The short title was "The spin foam action"
    Abstract: I present an action for simplicial gravity in first-order area-connection variables. The theory has a Hamiltonian and local gauge symmetries. Generic solutions represent twisted geometries, and have curvature – there is a deficit angle around triangles.

    Some references:
    *ww, New action for simplicial gravity in four dimensions (2014), arXiv:1407.0025.
    *ww, One-dimensional action for simplicial gravity in three dimensions, Phys. Rev. D 90 (2014), arXiv:1402.6708.
    *ww, Hamiltonian spinfoam gravity, Class. Quant. Grav. 31 (2014), arXiv:1301.5859.
    *M Cortês and L Smolin, Spin foam models as energetic causal sets (2014), arXiv:1407.0032.
    *L Freidel and S Speziale, From twistors to twisted geometries, Phys. Rev. D 82 (2010), arXiv:1006.0199.
     
    Last edited: Sep 17, 2014
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  3. Sep 17, 2014 #2

    marcus

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    The audio is 1 hour 16 minutes and concludes with one of the longest, most active and interesting discussions which I have heard at ILQGS (Wolfgang, Abhay, Carlo, Lee, Simone, Eugenio, and possibly others).
    ====
    In slide 5 Weiland mentions some unresolved issues in spinfoam QG, and puts forward his view on how they should be addressed.
     
  4. Sep 17, 2014 #3

    marcus

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    In case this talk interests readers in hearing more of the ILQGS talks (while following the slides) here is the main page, with links to audio and slides PDF.
    http://relativity.phys.lsu.edu/ilqgs/
    This can serve as a menu covering Fall and Spring semesters of past years, as well as the current semester.

    Here is the current semester schedule:
    http://relativity.phys.lsu.edu/ilqgs/schedulefa14.html
    Code (Text):

    Sep 2    [B]Casimir effect on a quantum geometry[/B]     Javier Olmedo   LSU
    Sep 16   [B]Cov LQG: classical action, phase space & gauge symmetries[/B]  Wolfgang Wieland PSU
    Sep 30   [B]Phenomenological consequences of quantum geometries in LQC[/B] Brajesh Gupt  PSU
    Oct 14   [B]White holes[/B]  Carlo Rovelli   CNRS Marseille
    Oct 28   [B]New applications for LQG[/B]     Jerzy Lewandowski   University of Warszaw
    Nov 11   [B]Lorentz transformations from abstract quantum theory[/B]     Philip Hoehn  PI
    Nov 25   TBA     Derek Wise  FAU Erlangen
    Dec 9    [B]Invariance of Connections and Measures in LQC[/B]  Maximilian Hanusch Uni Paderborn
     
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