Renormalization Group Approaches to Quantum Gravity (conference at PI)

[marcus]

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/

 

[atyy]

B Bahr: "Most of my talk will be from the realm of absolute nonsense, and rightfully so."

 

[marcus]

B Bahr: "Most of my talk will be from the realm of absolute nonsense, and rightfully so."

I thought he said "ABSTRACT nonsense"

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.

 

[atyy]

I thought he said "ABSTRACT nonsense"

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