Renormalization Group Approaches to Quantum Gravity

25 talks

April 22, 2014 - April 25, 2014

C14020

Collection Type

Conference/School

Description

Renormalization Group Approaches to Quantum Gravity Conference - Apr. 22-25th

Displaying 1 - 12 of 25

Recent developments in asymptotic safety: tests and properties

Tim Morris
University of Southampton

April 22, 2014

PIRSA:14040085
What you always wanted to know about CDT, but did not have time to read about in our papers

Renate Loll
Radboud Universiteit Nijmegen

April 22, 2014

PIRSA:14040086
Tensor models in the large N limit

Razvan Gurau
Universität Heidelberg

April 22, 2014

PIRSA:14040087
Renormalization of group field theories: motivations and a brief review

Daniele Oriti
Ludwig-Maximilians-Universität München (LMU)

April 22, 2014

PIRSA:14040088
Quantum Spacetime Engineering

Bianca Dittrich
Perimeter Institute for Theoretical Physics

April 22, 2014

PIRSA:14040089
What are the most pressing open questions in the application of the RG to gravity?
- Lee Smolin
  Perimeter Institute for Theoretical Physics
- Simone Speziale
  Aix-Marseille University
April 22, 2014

PIRSA:14040090
Perturbative quantum gravity calculations and running couplings

John Donoghue
University of Massachusetts Amherst

April 23, 2014

PIRSA:14040091
Lessons from asymptotic safety

Daniel Litim
University of Sussex

April 23, 2014

PIRSA:14040092
Confronting Asymptotically Safe Inflation with Planck data

Alfio Bonanno
National Institute for Astrophysics (INAF)

April 23, 2014

PIRSA:14040093
What happens to the Schwarzschild solution in quantum corrected gravity?

Kellogg Stelle
Imperial College London

April 23, 2014

PIRSA:14040094
Asymptotic safety in a pure matrix model

Tim Koslowski
Technical University of Applied Sciences Würzburg-Schweinfurt

April 23, 2014

PIRSA:14040096
Asymptotic safety in a pure matrix model

Jan Ambjorn
University of Copenhagen

April 23, 2014

PIRSA:14040097

Recent developments in asymptotic safety: tests and properties

Tim Morris
University of Southampton

April 22, 2014

PIRSA:14040085

The talk will review recent tests of the asymptotic safety conjecture within functional renormalisation group studies and progress in understanding the properties that such a fixed point would have.
What you always wanted to know about CDT, but did not have time to read about in our papers

Renate Loll
Radboud Universiteit Nijmegen

April 22, 2014

PIRSA:14040086

I will review the approach of Causal Dynamical Triangulations to nonperturbative quantum gravity, high-lighting some frequently mis- or ununderstood features, emphasizing recent developments and discussing some interesting open issues.
Tensor models in the large N limit

Razvan Gurau
Universität Heidelberg

April 22, 2014

PIRSA:14040087

Tensor models generalize matrix models and provide a framework for the study of random geometries in arbitrary dimensions. Like matrix models they support a 1/N expansion, where N is the size of the tensor, with an analytically controlled large N limit. In this talk I will present some recent results in this field and I will discuss their implications for quantum gravity.
Renormalization of group field theories: motivations and a brief review

Daniele Oriti
Ludwig-Maximilians-Universität München (LMU)

April 22, 2014

PIRSA:14040088

Group field theories are tensorial models enriched with group-theoretic data in order to define proper field theories of quantum geometry. They can be understood as a second quantised (Fock space) reformulation of loop quantum gravity kinematics and dynamics. The renormalization group provides, as a in any quantum field theory, a key tool to select well-defined models, to unravel the impact of quantum effects on the dynamics across different scales, and to study the continuum limit. Beside introducing the general formalism and clarifying the relation to other approaches, we will motivate the renormalisation group analysis of group field theories and review recent developments in this direction.
Quantum Spacetime Engineering

Bianca Dittrich
Perimeter Institute for Theoretical Physics

April 22, 2014

PIRSA:14040089

Given (a set of) fundamental models of quantum space time, for instance spin foam models, we aim to understand the large scale physics encoded in these fundamental models. Renormalization and coarse graining address this issue and help to understand how large scale physics depends on parameters in the fundamental models.

I will review recent work on coarse graining and renormalization of spin foam and analogue models, revealing possible large scale phases, depending on parameters of the microscopic models. I will explain how these phases are connected to topological field theories and possible vacua for the theory of quantum gravity, e.g. loop quantum gravity. I outline how these different vacua are connected to different representations of the observable algebra, that is different Hilbert spaces, and how this allows to expand the theory around different vacuum states.
What are the most pressing open questions in the application of the RG to gravity?
- Lee Smolin
  Perimeter Institute for Theoretical Physics
- Simone Speziale
  Aix-Marseille University
April 22, 2014

PIRSA:14040090
Perturbative quantum gravity calculations and running couplings

John Donoghue
University of Massachusetts Amherst

April 23, 2014

PIRSA:14040091

We know how to make perturbative calculations in quantum gravity using the framework of effective field theory. I will describe the basics of the effective field theory treatment and look at several calculations. There are obstacles to describing these with running coupling constants. Finally, I will do my best to try to connect these with the Asymptotic Safety program.
Lessons from asymptotic safety

Daniel Litim
University of Sussex

April 23, 2014

PIRSA:14040092

Two aspects of asymptotic safety are highlighted. First, I discuss how asymptotic safety can be tested with the help of a bootstrap strategy. This is then applied to high-order polynomial actions of the Ricci scalar and beyond. Second, I discuss how phenomenological signatures of asymptotic safety can be searched for at particle colliders such as the LHC, provided that the quantum gravity scale is in the TeV energy regime.
Confronting Asymptotically Safe Inflation with Planck data

Alfio Bonanno
National Institute for Astrophysics (INAF)

April 23, 2014

PIRSA:14040093
What happens to the Schwarzschild solution in quantum corrected gravity?

Kellogg Stelle
Imperial College London

April 23, 2014

PIRSA:14040094
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?
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.

Title	Speaker(s)	Date	Talk Type	Info
Recent developments in asymptotic safety: tests and properties	Tim Morris	2014-04-22	Conference	View details
What you always wanted to know about CDT, but did not have time to read about in our papers	Renate Loll	2014-04-22	Conference	View details
Tensor models in the large N limit	Razvan Gurau	2014-04-22	Conference	View details
Renormalization of group field theories: motivations and a brief review	Daniele Oriti	2014-04-22	Conference	View details
Quantum Spacetime Engineering	Bianca Dittrich	2014-04-22	Conference	View details
What are the most pressing open questions in the application of the RG to gravity?	Lee Smolin, Simone Speziale	2014-04-22	Conference	View details
Perturbative quantum gravity calculations and running couplings	John Donoghue	2014-04-23	Conference	View details
Lessons from asymptotic safety	Daniel Litim	2014-04-23	Conference	View details
Confronting Asymptotically Safe Inflation with Planck data	Alfio Bonanno	2014-04-23	Conference	View details
What happens to the Schwarzschild solution in quantum corrected gravity?	Kellogg Stelle	2014-04-23	Conference	View details
Asymptotic safety in a pure matrix model	Tim Koslowski	2014-04-23	Conference	View details
Asymptotic safety in a pure matrix model	Jan Ambjorn	2014-04-23	Conference	View details

Renormalization Group Approaches to Quantum Gravity

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