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On background-independent renormalization in state-sum model

Benjamin Bahr Universität Hamburg

April 24, 2014

PIRSA:14040101
13/14 PSI - Explorations in Cosmology - Lecture 13

Matthew Johnson York University

April 24, 2014

PIRSA:14040058
Global flows in quantum gravity

Jan Pawlowski Universität Heidelberg - Institut für Theoretische Physik

April 24, 2014

PIRSA:14040100
Grassmann tensor network renormalization and fermionic topological quantum field theory: a new route towards quantum gravity

Zheng-Cheng Gu Chinese University of Hong Kong

April 24, 2014

PIRSA:14040099
13/14 PSI - Explorations in Particle Theory - Lecture 13

Brian Shuve Harvey Mudd College

April 24, 2014

PIRSA:14040070
Refinement limit of quantum group spinnets

Mercedes Martin-Benito Complutense University of Madrid

April 23, 2014

PIRSA:14040098
Asymptotic safety in a pure matrix model

Jan Ambjorn University of Copenhagen

April 23, 2014

PIRSA:14040097
Asymptotic safety in a pure matrix model

Tim Koslowski Technical University of Applied Sciences Würzburg-Schweinfurt

April 23, 2014

PIRSA:14040096
Conformal Standard Model

Krzysztof Meissner University of Warsaw

April 23, 2014

PIRSA:14040061
What happens to the Schwarzschild solution in quantum corrected gravity?

Kellogg Stelle Imperial College London

April 23, 2014

PIRSA:14040094
Confronting Asymptotically Safe Inflation with Planck data

Alfio Bonanno National Institute for Astrophysics (INAF)

April 23, 2014

PIRSA:14040093
13/14 PSI - Explorations in Cosmology - Lecture 12

Matthew Johnson York University

April 23, 2014

PIRSA:14040057

On background-independent renormalization in state-sum model

Benjamin Bahr Universität Hamburg

April 24, 2014

PIRSA:14040101

In this talk we discuss some notion of coarse graining in state-sums, most notably a class of spin foam models in their holonomy representations. We discuss the notion of scale in this context, and how diffeomorphism-invariance ties into the existence of a continuum limit. We close with an example and muse about the interplay between diffeomorphism-invariance and non-renormalizability.
13/14 PSI - Explorations in Cosmology - Lecture 13

Matthew Johnson York University

April 24, 2014

PIRSA:14040058
Global flows in quantum gravity

Jan Pawlowski Universität Heidelberg - Institut für Theoretische Physik

April 24, 2014

PIRSA:14040100

In this talk I present recent work on complete UV-IR flows for the fully momentum-dependent propagator, RG-consistent vertices, Newtons coupling and the cosmological constant. For the first time, a global phase diagram is obtained where the non-Gaussian ultraviolet fixed point of asymptotic safety is connected via smooth trajectories to an infrared fixed point with classical scaling. Physics implications as well as the extension to gauge-matter-gravity systems are discussed.
Grassmann tensor network renormalization and fermionic topological quantum field theory: a new route towards quantum gravity

Zheng-Cheng Gu Chinese University of Hong Kong

April 24, 2014

PIRSA:14040099

Recently, the development of tensor network renormalization approach has provided us a powerful tool to construct new classes of topological quantum field theories(TQFTs) in discrete space-time. For example, the Turaev Viro’s states sum constructions are fixed point tensor networks representing a special class of 2+1D TQFTs. Interestingly, the Grassmann variable generalization of tensor network renormalization approach leads to new classes of TQFTs for interacting fermion systems, namely, the fermionic TQFTs. In this talk, I will start with a fermionic topological nonlinear sigma model and discuss its corresponding new mathematics - group super-cohomology theory. Then I will explain the fermionic generalization of Dijkgraaf -Witten gauge theory by using group supercohomology theory. Finally I will show examples beyond fermionic Dijkgraaf -Witten gauge theory and discuss possible new routes towards quantum gravity.
13/14 PSI - Explorations in Particle Theory - Lecture 13

Brian Shuve Harvey Mudd College

April 24, 2014

PIRSA:14040070
Refinement limit of quantum group spinnets

Mercedes Martin-Benito Complutense University of Madrid

April 23, 2014

PIRSA:14040098

The many-building-blocks limit of spin foam models remains to be an open question. The complexity of these models makes the analysis of their possible continuum phases a very difficult task. In the last years progress in this direction has been made by considering simplified, yet featured-rich, analog models to spin foams, the so-called spin net models. These models retain the main dynamical ingredient of spin foams, namely the simplicity constraints. In this talk we will introduce spin net models based on the quantum group SU(2)_q, and we will review the use of tensor network renormalization group techniques to study their coarse graining. We will analyze the resulting phase diagram, which interestingly displays a rich structure of fixed points. Furthermore we will discuss the relation of spin nets with spin foams.
Asymptotic safety in a pure matrix model

Jan Ambjorn University of Copenhagen

April 23, 2014

PIRSA:14040097

An attempt is made to define "lines of contant physics" in CDT and relate the corresponding picture to non-trivial UV fixed points as they appear in the asymptotic safety scenario.
Asymptotic safety in a pure matrix model

Tim Koslowski Technical University of Applied Sciences Würzburg-Schweinfurt

April 23, 2014

PIRSA:14040096

The connection between two-dimensional Euclidean gravity and pure matrix models has lead to may fundamental insights about quantum gravity and string theory. The pure matrix model is thus a blueprint for the connection between discrete models and Euclidean quantum gravity. I will report on work with Astrid Eichhorn in which this "blueprint" model is investigated with the functional renormalization group. In this model, I will discuss the questions: "What is a possible meaning of asymptotic safety in a discrete model?" and "Is it possible to apply the FRGE to tensor models?
Conformal Standard Model

Krzysztof Meissner University of Warsaw

April 23, 2014

PIRSA:14040061

I will describe a proposal of an enlargement of the Standard Model based on a softly broken conformal symmetry. It contains the usual particles of the SM with right-chiral neutrinos and predicts two new particles: a scalar mixing with the usual Higgs and a naturally weakly coupled axion. I will argue that the Planck scale should be treated as a real physical scale and discuss the hierarchy problem and renormalization from this point of view. I will show that the model does not need any intermediate scales and can be viable up to the Planck scale (in distiction to the Standard Model). I will present experimental predictions of the model.
What happens to the Schwarzschild solution in quantum corrected gravity?

Kellogg Stelle Imperial College London

April 23, 2014

PIRSA:14040094
Confronting Asymptotically Safe Inflation with Planck data

Alfio Bonanno National Institute for Astrophysics (INAF)

April 23, 2014

PIRSA:14040093
13/14 PSI - Explorations in Cosmology - Lecture 12

Matthew Johnson York University

April 23, 2014

PIRSA:14040057

Title	Date	Collection	Type	Info
On background-independent renormalization in state-sum model	2014‑04‑24	Renormalization Group Approaches to Quantum Gravity	Conference	View details
13/14 PSI - Explorations in Cosmology - Lecture 13	2014‑04‑24	13/14 PSI - Explorations in Cosmology	Course	View details
Global flows in quantum gravity	2014‑04‑24	Renormalization Group Approaches to Quantum Gravity	Conference	View details
Grassmann tensor network renormalization and fermionic topological quantum field theory: a new route towards quantum gravity	2014‑04‑24	Renormalization Group Approaches to Quantum Gravity	Conference	View details
13/14 PSI - Explorations in Particle Theory - Lecture 13	2014‑04‑24	13/14 PSI - Explorations in Particle Theory	Course	View details
Refinement limit of quantum group spinnets	2014‑04‑23	Renormalization Group Approaches to Quantum Gravity	Conference	View details
Asymptotic safety in a pure matrix model	2014‑04‑23	Renormalization Group Approaches to Quantum Gravity	Conference	View details
Asymptotic safety in a pure matrix model	2014‑04‑23	Renormalization Group Approaches to Quantum Gravity	Conference	View details
Conformal Standard Model	2014‑04‑23	Colloquium	Scientific Series	View details
What happens to the Schwarzschild solution in quantum corrected gravity?	2014‑04‑23	Renormalization Group Approaches to Quantum Gravity	Conference	View details
Confronting Asymptotically Safe Inflation with Planck data	2014‑04‑23	Renormalization Group Approaches to Quantum Gravity	Conference	View details
13/14 PSI - Explorations in Cosmology - Lecture 12	2014‑04‑23	13/14 PSI - Explorations in Cosmology	Course	View details

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Format results

On background-independent renormalization in state-sum model

13/14 PSI - Explorations in Cosmology - Lecture 13

Global flows in quantum gravity

Grassmann tensor network renormalization and fermionic topological quantum field theory: a new route towards quantum gravity

13/14 PSI - Explorations in Particle Theory - Lecture 13

Refinement limit of quantum group spinnets

Asymptotic safety in a pure matrix model

Asymptotic safety in a pure matrix model

Conformal Standard Model

What happens to the Schwarzschild solution in quantum corrected gravity?

Confronting Asymptotically Safe Inflation with Planck data

13/14 PSI - Explorations in Cosmology - Lecture 12

On background-independent renormalization in state-sum model

13/14 PSI - Explorations in Cosmology - Lecture 13

Global flows in quantum gravity

Grassmann tensor network renormalization and fermionic topological quantum field theory: a new route towards quantum gravity

13/14 PSI - Explorations in Particle Theory - Lecture 13

Refinement limit of quantum group spinnets

Asymptotic safety in a pure matrix model

Asymptotic safety in a pure matrix model

Conformal Standard Model

What happens to the Schwarzschild solution in quantum corrected gravity?

Confronting Asymptotically Safe Inflation with Planck data

13/14 PSI - Explorations in Cosmology - Lecture 12