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Bounce in Loop Quantum Cosmology and its Implications

Abhay Ashtekar Pennsylvania State University
June 26, 2017

PIRSA:17060095
Astrophysics
Welcome and Opening Remarks
- Steffen Gielen University of Sheffield
- Neil Turok University of Edinburgh
June 26, 2017

PIRSA:17060094
Astrophysics
The Universal Renormalization Group Machine - 2

Frank Saueressig Radboud Universiteit Nijmegen
June 23, 2017

PIRSA:17060092
General Relativity & Quantum Cosmology
The Universal Renormalization Group Machine - 1

Frank Saueressig Radboud Universiteit Nijmegen
June 23, 2017

PIRSA:17060091
General Relativity & Quantum Cosmology
Numerical loop quantum cosmology

Parampreet Singh Louisiana State University
June 23, 2017

PIRSA:17060090
General Relativity & Quantum Cosmology
Numerical loop quantum cosmology

Parampreet Singh Louisiana State University
June 23, 2017

PIRSA:17060089
General Relativity & Quantum Cosmology
Quantum Gravity from Lattice Gauge Theory via Holography

Masanori Hanada Kyoto University
June 22, 2017

PIRSA:17060088
General Relativity & Quantum Cosmology
Tutorial: Coarse-graining of Spin Foams
- Benjamin Bahr Universität Hamburg
- Bianca Dittrich Perimeter Institute for Theoretical Physics
- Sebastian Steinhaus Friedrich Schiller University Jena
June 22, 2017

PIRSA:17060087
General Relativity & Quantum Cosmology
Tutorial: Monte Carlo methods in Dynamical Triangulations
- Timothy Budd Radboud Universiteit Nijmegen
- Joren Brunekreef Radboud Universiteit Nijmegen
June 22, 2017

PIRSA:17060086
General Relativity & Quantum Cosmology
Coarse-graining of Spin Foams - 4
- Benjamin Bahr Universität Hamburg
- Bianca Dittrich Perimeter Institute for Theoretical Physics
June 22, 2017

PIRSA:17060085
General Relativity & Quantum Cosmology
Coarse-graining of Spin Foams - 3
- Benjamin Bahr Universität Hamburg
- Bianca Dittrich Perimeter Institute for Theoretical Physics
June 22, 2017

PIRSA:17060084
General Relativity & Quantum Cosmology
Monte Carlo methods in Dynamical Triangulations - 4

Timothy Budd Radboud Universiteit Nijmegen
June 22, 2017

PIRSA:17060083
General Relativity & Quantum Cosmology

Bounce in Loop Quantum Cosmology and its Implications

Abhay Ashtekar Pennsylvania State University
June 26, 2017

PIRSA:17060095
Astrophysics
There is a huge body of work in Loop Quantum Cosmology comprising of several thousand journal articles. I will provide an overview of conclusions, focusing on the difficult conceptual and mathematical issues that accompany the notion of a bounce and opening the way for phenomenological implications that will be discussed by Ivan Agullo.
Welcome and Opening Remarks
- Steffen Gielen University of Sheffield
- Neil Turok University of Edinburgh
June 26, 2017

PIRSA:17060094
Astrophysics
The Universal Renormalization Group Machine - 2

Frank Saueressig Radboud Universiteit Nijmegen
June 23, 2017

PIRSA:17060092
General Relativity & Quantum Cosmology
Functional renormalization group techniques based on Wetterichs equation provide a powerful tool for studying the properties of gravity in the quantum regime and its connection to the observable low-energy world. Explicit computations in this framework require the evaluation of functional traces over operator-valued functions. In these lectures I will give a pedagogical introduction to the Universal Renormalization Group Machine, a combinatorial algorithm which allows evaluating such traces in a systematic way. Moreover, I will discuss flow equations for “composite operators” which may pave the route towards developing a microscopic description of quantum spacetime within the Asymptotic Safety approach.
The Universal Renormalization Group Machine - 1

Frank Saueressig Radboud Universiteit Nijmegen
June 23, 2017

PIRSA:17060091
General Relativity & Quantum Cosmology
Functional renormalization group techniques based on Wetterichs equation provide a powerful tool for studying the properties of gravity in the quantum regime and its connection to the observable low-energy world. Explicit computations in this framework require the evaluation of functional traces over operator-valued functions. In these lectures I will give a pedagogical introduction to the Universal Renormalization Group Machine, a combinatorial algorithm which allows evaluating such traces in a systematic way. Moreover, I will discuss flow equations for “composite operators” which may pave the route towards developing a microscopic description of quantum spacetime within the Asymptotic Safety approach.
Numerical loop quantum cosmology

Parampreet Singh Louisiana State University
June 23, 2017

PIRSA:17060090
General Relativity & Quantum Cosmology
In the last decade various cosmological spacetimes have been quantized using the techniques of loop quantum gravity. To understand singularity resolution and decipher reliable Planck scale physics, development of new numerical methods and usage of high performance computing is critical in loop quantum cosmology. In recent years, these developments have robustly demonstrated resolution of singularities in quantum spacetimes. These methods have provided detailed understanding of the emergence of new physics at Planck scale, and of classicality when spacetime curvature becomes very small. Further, they have validated an effective spacetime description of the underlying quantum geometry -- a key ingredient of phenomenological predictions in loop quantum cosmology. These lectures will introduce these numerical methods.
Numerical loop quantum cosmology

Parampreet Singh Louisiana State University
June 23, 2017

PIRSA:17060089
General Relativity & Quantum Cosmology
In the last decade various cosmological spacetimes have been quantized using the techniques of loop quantum gravity. To understand singularity resolution and decipher reliable Planck scale physics, development of new numerical methods and usage of high performance computing is critical in loop quantum cosmology. In recent years, these developments have robustly demonstrated resolution of singularities in quantum spacetimes. These methods have provided detailed understanding of the emergence of new physics at Planck scale, and of classicality when spacetime curvature becomes very small. Further, they have validated an effective spacetime description of the underlying quantum geometry -- a key ingredient of phenomenological predictions in loop quantum cosmology. These lectures will introduce these numerical methods.
Quantum Gravity from Lattice Gauge Theory via Holography

Masanori Hanada Kyoto University
June 22, 2017

PIRSA:17060088
General Relativity & Quantum Cosmology
The gauge/gravity duality relates supersymmetric gauge theories to superstring/M-theory. Powerful Monte Carlo methods developed in lattice QCD can be applied to study the former,and from the simulation data we can extract the quantum gravitational effects. In this talk I will give a brief introduction to lattice gauge theory and supersymmetry on a lattice, and show some applications to quantum gravity via the gauge/gravity duality.
Tutorial: Coarse-graining of Spin Foams
- Benjamin Bahr Universität Hamburg
- Bianca Dittrich Perimeter Institute for Theoretical Physics
- Sebastian Steinhaus Friedrich Schiller University Jena
June 22, 2017

PIRSA:17060087
General Relativity & Quantum Cosmology
Tutorial: Monte Carlo methods in Dynamical Triangulations
- Timothy Budd Radboud Universiteit Nijmegen
- Joren Brunekreef Radboud Universiteit Nijmegen
June 22, 2017

PIRSA:17060086
General Relativity & Quantum Cosmology
Coarse-graining of Spin Foams - 4
- Benjamin Bahr Universität Hamburg
- Bianca Dittrich Perimeter Institute for Theoretical Physics
June 22, 2017

PIRSA:17060085
General Relativity & Quantum Cosmology
Coarse-graining of Spin Foams - 3
- Benjamin Bahr Universität Hamburg
- Bianca Dittrich Perimeter Institute for Theoretical Physics
June 22, 2017

PIRSA:17060084
General Relativity & Quantum Cosmology
Monte Carlo methods in Dynamical Triangulations - 4

Timothy Budd Radboud Universiteit Nijmegen
June 22, 2017

PIRSA:17060083
General Relativity & Quantum Cosmology

Title	Speaker(s)	Date	Talk Type	Info link
Bounce in Loop Quantum Cosmology and its Implications	Abhay Ashtekar	2017-06-26	Conference	View details
Welcome and Opening Remarks	Steffen Gielen, Neil Turok	2017-06-26	Conference	View details
The Universal Renormalization Group Machine - 2	Frank Saueressig	2017-06-23	Conference	View details
The Universal Renormalization Group Machine - 1	Frank Saueressig	2017-06-23	Conference	View details
Numerical loop quantum cosmology	Parampreet Singh	2017-06-23	Conference	View details
Numerical loop quantum cosmology	Parampreet Singh	2017-06-23	Conference	View details
Quantum Gravity from Lattice Gauge Theory via Holography	Masanori Hanada	2017-06-22	Conference	View details
Tutorial: Coarse-graining of Spin Foams	Benjamin Bahr, Bianca Dittrich, Sebastian Steinhaus	2017-06-22	Conference	View details
Tutorial: Monte Carlo methods in Dynamical Triangulations	Timothy Budd, Joren Brunekreef	2017-06-22	Conference	View details
Coarse-graining of Spin Foams - 4	Benjamin Bahr, Bianca Dittrich	2017-06-22	Conference	View details
Coarse-graining of Spin Foams - 3	Benjamin Bahr, Bianca Dittrich	2017-06-22	Conference	View details
Monte Carlo methods in Dynamical Triangulations - 4	Timothy Budd	2017-06-22	Conference	View details

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Bounce in Loop Quantum Cosmology and its Implications

Welcome and Opening Remarks

The Universal Renormalization Group Machine - 2

The Universal Renormalization Group Machine - 1

Numerical loop quantum cosmology

Numerical loop quantum cosmology

Quantum Gravity from Lattice Gauge Theory via Holography

Tutorial: Coarse-graining of Spin Foams

Tutorial: Monte Carlo methods in Dynamical Triangulations

Coarse-graining of Spin Foams - 4

Coarse-graining of Spin Foams - 3

Monte Carlo methods in Dynamical Triangulations - 4

Bounce in Loop Quantum Cosmology and its Implications

Welcome and Opening Remarks

The Universal Renormalization Group Machine - 2

The Universal Renormalization Group Machine - 1

Numerical loop quantum cosmology

Numerical loop quantum cosmology

Quantum Gravity from Lattice Gauge Theory via Holography

Tutorial: Coarse-graining of Spin Foams

Tutorial: Monte Carlo methods in Dynamical Triangulations

Coarse-graining of Spin Foams - 4

Coarse-graining of Spin Foams - 3

Monte Carlo methods in Dynamical Triangulations - 4