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Renormalization Group Approaches to Quantum Gravity (conference at PI)

  1. Apr 26, 2014 #1

    marcus

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    Perimeter conference http://pirsa.org/C14020
    Here are links to the talks' videos and slides PDF


    Recent developments in asymptotic safety: tests and properties
    Tim Morris
    http://pirsa.org/14040085/

    What you always wanted to know about CDT, but did not have time to read about in our papers
    Renate Loll
    http://pirsa.org/14040086/

    Tensor models in the large N limit
    Razvan Gurau
    http://pirsa.org/14040087/

    Renormalization of group field theories: motivations and a brief review
    Daniele Oriti
    http://pirsa.org/14040088/

    Quantum Spacetime Engineering
    Bianca Dittrich
    http://pirsa.org/14040089/

    What are the most pressing open questions in the application of the RG to gravity?
    Lee Smolin, Simone Speziale
    http://pirsa.org/14040090/

    Perturbative quantum gravity calculations and running couplings
    John Donoghue
    http://pirsa.org/14040091/

    Lessons from asymptotic safety
    Daniel Litim
    http://pirsa.org/14040092/

    Confronting Asymptotically Safe Inflation with Planck data
    Alfio Bonanno
    http://pirsa.org/14040093/

    What happens to the Schwarzschild solution in quantum corrected gravity?
    Kellogg Stelle
    http://pirsa.org/14040094/

    Asymptotic safety in a pure matrix model
    Tim Koslowski
    http://pirsa.org/14040096/

    Asymptotic safety in a pure matrix model
    Jan Ambjorn
    http://pirsa.org/14040097/

    Refinement limit of quantum group spinnets
    Mercedes Martin-Benito
    http://pirsa.org/14040098/

    Grassmann tensor network renormalization and fermionic topological quantum field theory: a new route towards quantum gravity
    Zheng-Cheng Gu
    http://pirsa.org/14040099/

    Global flows in quantum gravity
    Jan Pawlowski
    http://pirsa.org/14040100/

    On background-independent renormalization in state-sum model
    Benjamin Bahr
    http://pirsa.org/14040101/

    Phases of Gravity
    Petr Horava
    http://pirsa.org/14040104/

    One-loop renormalization in a toy model of Horava-Lifshitz gravity
    Dario Benedetti
    http://pirsa.org/14040105/

    Gravitational RG flows on foliated spacetimes
    Frank Saueressig
    http://pirsa.org/14040106/

    The Asymptotic Safety Program: New results and an inconvenient truth
    Martin Reuter
    http://pirsa.org/14040108/

    Why matter matters in quantum gravity
    Astrid Eichhorn
    http://pirsa.org/14040109/

    Renormalization of entanglement entropy and the gravitational effective action
    Joshua Cooperman
    http://pirsa.org/14040110/

    Renormalization group approach to 3d group field theory
    Sylvain Carrozza
    http://pirsa.org/14040112/

    Between Matrices and Tensors
    Vincent Rivasseau
    http://pirsa.org/14040113/

    Double scaling in tensor models
    James Ryan
    http://pirsa.org/14040114/
     
    Last edited: Apr 26, 2014
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  3. Apr 26, 2014 #2

    atyy

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    B Bahr: "Most of my talk will be from the realm of absolute nonsense, and rightfully so." :smile:
     
  4. Apr 26, 2014 #3

    marcus

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    I thought he said "ABSTRACT nonsense" :biggrin:

    That is a term of art among mathematicians, e.g. Category Theory is often affectionately referred to as "abstract nonsense".
    At that point Bahr was explaining to the audience that he was a mathematician (more than a physicist) so it was a more mathematical viewpoint that they should expect from his talk.

    He defined renorm flow, maybe also continuum limit, in terms not of a LINEAR ORDERED set like conventional "scale" or natural numbers 1, 2, 3….but in terms of a PARTIAL ORDERING. The term he used is familiar in topology---a "filter".
    I remember learning filters (a generalization of the idea of limit) in a topology class taught by John Kelly.

    Another way of addressing the refining&summing puzzle we've sometimes talked about.

    I thought it was a nice talk. Bahr is one of Dittrich's bunch, I think.

    BTW I thought Dittrich's talk was really good! And the first half is comparatively easy to understand and I would recommend it to anybody who wants to know something about current QG.
    She treats a number of approaches collectively and outlines the main concepts.

    In the second half of the talk she is more concerned with defining the problems the researchers are now dealing with. So it is necessarily more technical.
    Watch the first half of the talk for a savvy accessible overview.
     
    Last edited: Apr 26, 2014
  5. Apr 26, 2014 #4

    atyy

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    Indeed, now that I'm listening with better speakers :)
     
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