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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
Lessons from asymptotic safety

Daniel Litim University of Sussex

April 23, 2014

PIRSA:14040092
Perturbative quantum gravity calculations and running couplings

John Donoghue University of Massachusetts Amherst

April 23, 2014

PIRSA:14040091
13/14 PSI - Explorations in Particle Theory - Lecture 12

Brian Shuve Harvey Mudd College

April 23, 2014

PIRSA:14040069
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
Quantum criticality in SU(N) anti-ferromagnets: general strategies to circumvent the sign problem

Ribhu Kaul University of Kentucky
April 22, 2014

PIRSA:14040083
Condensed Matter
Quantum Spacetime Engineering

Bianca Dittrich Perimeter Institute for Theoretical Physics

April 22, 2014

PIRSA:14040089
Renormalization of group field theories: motivations and a brief review

Daniele Oriti Complutense University of Madrid

April 22, 2014

PIRSA:14040088

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
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.
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.
13/14 PSI - Explorations in Particle Theory - Lecture 12

Brian Shuve Harvey Mudd College

April 23, 2014

PIRSA:14040069
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
Quantum criticality in SU(N) anti-ferromagnets: general strategies to circumvent the sign problem

Ribhu Kaul University of Kentucky
April 22, 2014

PIRSA:14040083
Condensed Matter
In the first part of the seminar, I will describe a general approach to write down a large family of model SU(N) anti-ferromagnets that do not suffer from the sign problem. In the second half I will show how such Hamiltonians are useful for the study of deconfined quantum critical points and possibly other exotic physics.
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.
Renormalization of group field theories: motivations and a brief review

Daniele Oriti Complutense University of Madrid

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.

Title	Date	Collection	Type	Info
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
Lessons from asymptotic safety	2014‑04‑23	Renormalization Group Approaches to Quantum Gravity	Conference	View details
Perturbative quantum gravity calculations and running couplings	2014‑04‑23	Renormalization Group Approaches to Quantum Gravity	Conference	View details
13/14 PSI - Explorations in Particle Theory - Lecture 12	2014‑04‑23	13/14 PSI - Explorations in Particle Theory	Course	View details
What are the most pressing open questions in the application of the RG to gravity?	2014‑04‑22	Renormalization Group Approaches to Quantum Gravity	Conference	View details
Quantum criticality in SU(N) anti-ferromagnets: general strategies to circumvent the sign problem	2014‑04‑22	Quantum Matter	Scientific Series	View details
Quantum Spacetime Engineering	2014‑04‑22	Renormalization Group Approaches to Quantum Gravity	Conference	View details
Renormalization of group field theories: motivations and a brief review	2014‑04‑22	Renormalization Group Approaches to Quantum Gravity	Conference	View details

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