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Quantum Foundations - 2
- David Schroeren University of Oxford
- Paolo Bertozzini Thammasat University
- Bruno Hartmann
July 26, 2013

PIRSA:13070088
Mixed Session
- Valerio Astuti
- Seth Major Hamilton College
- Michael Reisenberger Universidad de la Republica Uruguay
- Jacobo Diaz-Polo
July 26, 2013

PIRSA:13070090
Discrete Approaches and Mixed Session
- Goffredo Chirco Max Planck Institute for Gravitational Physics - Albert Einstein Institute (AEI)
- Eugene Kur University of California, Berkeley
- Christopher Duston Florida State University
- Johannes Thuerigen University of Münster
- Bianca Dittrich Perimeter Institute for Theoretical Physics
July 26, 2013

PIRSA:13070085
Quantum Cosmology - 4
- Daniel Martin de Blas Universidade Federal do Espírito Santo
- Adriano Contillo Radboud Universiteit Nijmegen
- Marcin Kisielowski University of Warsaw
- Eduardo Martin-Martinez University of Waterloo
July 26, 2013

PIRSA:13060026
Quantum Foundations - 1
- Lee Smolin Perimeter Institute for Theoretical Physics
- Robert Spekkens Perimeter Institute for Theoretical Physics
- Robert Oeckl Universidad Nacional Autónoma De Mexico (UNAM)
- Jonathan Oppenheim University College London
- Markus Müller Institute for Quantum Optics and Quantum Information (IQOQI) - Vienna
July 26, 2013

PIRSA:13070084
Canonical Quantum Gravity and Spin Foams
- Antonia Zipfel
- Mingyi Zhang Aix-Marseille University
- Atousa Chaharsough Shirazi
- Fabio Anza Università di Pisa
- Aristide Baratin SAIT AI Lab Montreal
July 26, 2013

PIRSA:13070086
Promising Paths: What Have We Learned So Far About Quantum Gravity?
- Abhay Ashtekar Pennsylvania State University
- Carlo Rovelli Aix-Marseille University
July 26, 2013

PIRSA:13070083
Scenes From Polymer Quantization

Viqar Husain University of New Brunswick

July 26, 2013

PIRSA:13070082
Diffeomorphism Invariant Gauge Theories

Kirill Krasnov University of Nottingham

July 26, 2013

PIRSA:13070081
Spontaneous Dimensional Reduction?

Steve Carlip University of California, Davis

July 26, 2013

PIRSA:13070070
Closing Remarks

July 25, 2013

PIRSA:13070094
Canonical Quantum Gravity - 4
- Suzanne Lanery Universidad Nacional Autónoma De Mexico (UNAM)
- Maximilian Hanusch Universität Paderborn
- Yongge Ma Beijing Normal University
July 25, 2013

PIRSA:13070078

Quantum Foundations - 2
- David Schroeren University of Oxford
- Paolo Bertozzini Thammasat University
- Bruno Hartmann
July 26, 2013

PIRSA:13070088
Mixed Session
- Valerio Astuti
- Seth Major Hamilton College
- Michael Reisenberger Universidad de la Republica Uruguay
- Jacobo Diaz-Polo
July 26, 2013

PIRSA:13070090
Discrete Approaches and Mixed Session
- Goffredo Chirco Max Planck Institute for Gravitational Physics - Albert Einstein Institute (AEI)
- Eugene Kur University of California, Berkeley
- Christopher Duston Florida State University
- Johannes Thuerigen University of Münster
- Bianca Dittrich Perimeter Institute for Theoretical Physics
July 26, 2013

PIRSA:13070085
Quantum Cosmology - 4
- Daniel Martin de Blas Universidade Federal do Espírito Santo
- Adriano Contillo Radboud Universiteit Nijmegen
- Marcin Kisielowski University of Warsaw
- Eduardo Martin-Martinez University of Waterloo
July 26, 2013

PIRSA:13060026
Quantum Foundations - 1
- Lee Smolin Perimeter Institute for Theoretical Physics
- Robert Spekkens Perimeter Institute for Theoretical Physics
- Robert Oeckl Universidad Nacional Autónoma De Mexico (UNAM)
- Jonathan Oppenheim University College London
- Markus Müller Institute for Quantum Optics and Quantum Information (IQOQI) - Vienna
July 26, 2013

PIRSA:13070084
Canonical Quantum Gravity and Spin Foams
- Antonia Zipfel
- Mingyi Zhang Aix-Marseille University
- Atousa Chaharsough Shirazi
- Fabio Anza Università di Pisa
- Aristide Baratin SAIT AI Lab Montreal
July 26, 2013

PIRSA:13070086
Promising Paths: What Have We Learned So Far About Quantum Gravity?
- Abhay Ashtekar Pennsylvania State University
- Carlo Rovelli Aix-Marseille University
July 26, 2013

PIRSA:13070083

In LQG we work in the spirit of Antonio Machado: "Traveler, there is no path; Paths are made by walking." I will present a bird's eye view of some of the paths that have emerged since Loops 11 and offer a few suggestions.

I try to make the point about what we know and what we do not yet know about the possibility of writing a quantum theory of gravity.
Scenes From Polymer Quantization

Viqar Husain University of New Brunswick

July 26, 2013

PIRSA:13070082

A regime of "polymer quantum field theory on curved spacetime" should emerge in a low energy approximation of quantum gravity based on LQG ideas. This era should be characterized by a polymer scale, and give modifications to the usual semiclassical approximation. I will describe work on gravitational collapse, cosmology, and statistical mechanics in this setting. Results include models of horizon evaporation, inflation and graceful exit without an inflaton potential, and an indication of dimensional reduction from 4 to 2.5 dimensions.
Diffeomorphism Invariant Gauge Theories

Kirill Krasnov University of Nottingham

July 26, 2013

PIRSA:13070081

I will describe a very large class of gauge theories that do not use any external structure such as e.g. a spacetime metric in their construction. When the gauge group is taken to be SL(2) these theories describe interacting gravitons, with GR being just a particular member of a whole family of gravity theories. Taking larger gauge groups one obtains gravity coupled to various matter systems. In particular, I will show how gravity together with Yang-Mills gauge fields arise from one and the same diffeomorphism invariant gauge theory Lagrangian. Finally, I will describe what is known about these theories quantum mechanically.
Spontaneous Dimensional Reduction?

Steve Carlip University of California, Davis

July 26, 2013

PIRSA:13070070

Several lines of evidence hint that quantum gravity at distances a bit larger than the Planck scale may become effectively two-dimensional. I will summarize the evidence for this "spontaneous dimensional reduction," and suggest a further argument based on the effect of vacuum fluctuations on light cones. If this description proves to be correct, it suggests an interesting relationship between small-scale quantum spacetime and the behavior of cosmologies near a spacelike singularity.
Closing Remarks

July 25, 2013

PIRSA:13070094
Canonical Quantum Gravity - 4
- Suzanne Lanery Universidad Nacional Autónoma De Mexico (UNAM)
- Maximilian Hanusch Universität Paderborn
- Yongge Ma Beijing Normal University
July 25, 2013

PIRSA:13070078

Title	Date	Collection	Type	Info
Quantum Foundations - 2	2013‑07‑26	Loops 13	Conference	View details
Mixed Session	2013‑07‑26	Loops 13	Conference	View details
Discrete Approaches and Mixed Session	2013‑07‑26	Loops 13	Conference	View details
Quantum Cosmology - 4	2013‑07‑26	Loops 13	Conference	View details
Quantum Foundations - 1	2013‑07‑26	Loops 13	Conference	View details
Canonical Quantum Gravity and Spin Foams	2013‑07‑26	Loops 13	Conference	View details
Promising Paths: What Have We Learned So Far About Quantum Gravity?	2013‑07‑26	Loops 13	Conference	View details
Scenes From Polymer Quantization	2013‑07‑26	Loops 13	Conference	View details
Diffeomorphism Invariant Gauge Theories	2013‑07‑26	Loops 13	Conference	View details
Spontaneous Dimensional Reduction?	2013‑07‑26	Loops 13	Conference	View details
Closing Remarks	2013‑07‑25	Loops 13	Conference	View details
Canonical Quantum Gravity - 4	2013‑07‑25	Loops 13	Conference	View details

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