Quantum gravity is concerned with unifying Einstein's general theory of relativity with quantum theory into a single theoretical framework. At Perimeter Institute, researchers are actively pursuing a number of approaches to this problem including loop quantum gravity, spin foam models, asymptotic safety, emergent gravity, string theory, and causal set theory. We are also particularly interested in experimental implications of these different proposals. As the aim is a unification of the laws of physics into a single theory, the search for quantum gravity overlaps with other areas such as cosmology, particle physics and the foundations of quantum theory.
Format results
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25 talks-Collection NumberC19047
Talk
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Welcome and Opening Remarks
Perimeter Institute for Theoretical Physics -
Quantum Spacetime from Lattice Gravity à la CDT
Radboud Universiteit Nijmegen -
How complement maps can cure divergences
University of Potsdam -
The gravitational Wilson loop and the non-Abelian Stokes' theorem
Okinawa Institute of Science and Technology Graduate University -
The dynamics of difference
Perimeter Institute for Theoretical Physics -
Quantum reference frames for space and time
ETH Zurich -
Probing fundamental physics with gravitational waves
Universidade Federal do ABC -
Implications of the Quantum Nature Space-time for the Big Bang and Black Holes
Pennsylvania State University
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Simplicity III
17 talks-Collection NumberC19044Talk
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On the possible role of nilpotent internal symmetries in unification
Wigner Research Center for Physics -
Rethinking the origin of neutrino masses: the role of gravity
University of Bonn -
Swampland Constraints on Neutrino Masses and Dark Energy
European Organization for Nuclear Research (CERN) -
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Exceptional Quantum Algebra for the Standard Model of Particle Physics
Bulgarian Academy of Sciences -
SO(7,7) Structure of Standard Model Fermions
University of Nottingham -
The Standard Model from A Jordan Algebra
University of Edinburgh -
Particle Theory from Jordan Geometry
University of Regensburg
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PSI 2019/2020 - Relativity (Kubiznak)
15 talks-Collection NumberC19039Talk
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PSI 2019/2020 - Relativity (Kubiznak) - Lecture 2
Charles University -
PSI 2019/2020 - Relativity (Kubiznak) - Lecture 3
Charles University -
PSI 2019/2020 - Relativity (Kubiznak) - Lecture 4
Charles University -
PSI 2019/2020 - Relativity (Kubiznak) - Lecture 5
Charles University -
PSI 2019/2020 - Relativity (Kubiznak) - Lecture 6
Charles University -
PSI 2019/2020 - Relativity (Kubiznak) - Lecture 7
Charles University -
PSI 2019/2020 - Relativity (Kubiznak) - Lecture 8
Charles University
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PSI 2019/2020 - Classical Physics (Kubiznak)
8 talks-Collection NumberC19032Talk
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PSI 2018/2019 - Explorations in Quantum Gravity (Dupuis)
15 talks-Collection NumberC19014Talk
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PSI 2018/2019 - Explorations in Quantum Gravity - Lecture 1
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Perimeter Institute for Theoretical Physics
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Perimeter Institute for Theoretical Physics
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PSI 2018/2019 - Explorations in Quantum Gravity - Lecture 2
Perimeter Institute for Theoretical Physics -
PSI 2018/2019 - Explorations in Quantum Gravity - Lecture 3
Perimeter Institute for Theoretical Physics -
PSI 2018/2019 - Explorations in Quantum Gravity - Lecture 4
Perimeter Institute for Theoretical Physics -
PSI 2018/2019 - Explorations in Quantum Gravity - Lecture 5
Perimeter Institute for Theoretical Physics -
PSI 2018/2019 - Explorations in Quantum Gravity - Lecture 6
Perimeter Institute for Theoretical Physics -
PSI 2018/2019 - Explorations in Quantum Gravity - Lecture 7
Perimeter Institute for Theoretical Physics -
PSI 2018/2019 - Explorations in Quantum Gravity - Lecture 8
Perimeter Institute for Theoretical Physics
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PSI 2017/2018 - Quantum Gravity (Dupuis)
15 talks-Collection NumberC17052Talk
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PSI 2017/2018 - Quantum Gravity - Lecture 1
Radboud Universiteit Nijmegen -
PSI 2017/2018 - Quantum Gravity - Lecture 2
Perimeter Institute for Theoretical Physics -
PSI 2017/2018 - Quantum Gravity - Lecture 3
Perimeter Institute for Theoretical Physics -
PSI 2017/2018 - Quantum Gravity - Lecture 4
Perimeter Institute for Theoretical Physics -
PSI 2017/2018 - Quantum Gravity - Lecture 5
Perimeter Institute for Theoretical Physics -
PSI 2017/2018 - Quantum Gravity - Lecture 6
Perimeter Institute for Theoretical Physics -
PSI 2017/2018 - Quantum Gravity - Lecture 7
Perimeter Institute for Theoretical Physics -
PSI 2017/2018 - Quantum Gravity - Lecture 8
Perimeter Institute for Theoretical Physics
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The Path Integral for Gravity
18 talks-Collection NumberC17057Talk
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Welcome and Opening Remarks
University of Edinburgh -
The significance of the proper time in the quantum mechanics of the gravitational field.
Centro de Estudios Científicos (CECs) -
TBA
Ludwig-Maximilians-Universität München (LMU) -
Semi-classical evaluation of the 3D gravity path integral and quasi-local holography
Perimeter Institute for Theoretical Physics -
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An asymptotically safe point of view on the gravitational path integral
Universität Heidelberg -
The path integral for gravity and Fedosov quantization
Universität Leipzig -
Surprises in the Path Integral for Gravity
University of Edinburgh
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Quantum Black Holes in the Sky?
34 talks-Collection NumberC17055Talk
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Quantifying the evidence for black holes with GW and EM probes
Instituto Superior Tecnico - Departamento de Física -
Echoes from the Abyss: Tentative Evidence for Planck-Scale Structure at Black Hole Horizons
University of Stavanger (UiS) -
Improvements on the methods for searching echoes
Albert Einstein Institute -
A model-independent search for gravitational-wave echoes
Institucio Catalana de Recerca I Estudis Avancats (ICREA) - Universitat de Barcelona -
An alternative significance estimation for the evidence for echoes
Albert Einstein Institute -
Discussion: Evidence for Echoes
PIRSA:17110074 -
Inspiral Tests of Strong-field Gravity and Ringdown Tests of Quantum Black Holes
University of Virginia -
A Recipe for Echoes
The University of Texas at Austin
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Talk
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Semisimple Hopf algebras and fusion categories
Universidad de los Andes -
The Hopf C*-algebraic quantum double models - symmetries beyond group theory
Freie Universität Berlin -
Modular categories and the Witt group
Radboud Universiteit Nijmegen -
Topological Quantum Computation
Texas A&M University -
Gapped phases of matter vs. Topological field theories
Perimeter Institute for Theoretical Physics -
An Introduction to Hopf Algebra Gauge Theory
University of Erlangen-Nuremberg -
Kitaev lattice models as a Hopf algebra gauge theory
University of Erlangen-Nuremberg -
Topological defects and higher-categorical structures
Karlstad University
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Making Quantum Gravity Computable
31 talks-Collection NumberC17023Talk
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Welcome and Opening Remarks
Perimeter Institute for Theoretical Physics -
Introduction to Monte Carlo methods - 1
Utrecht University -
Introduction to Monte Carlo methods - 2
Utrecht University -
Introduction to Tensor Network methods - 1
Alphabet (United States) -
Introduction to Tensor Network methods - 2
Alphabet (United States) -
Tutorial: Introduction to Monte Carlo Methods
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Utrecht University
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Radboud Universiteit Nijmegen
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Tutorial: Introduction to Tensor Network methods
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Alphabet (United States)
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Institut des Hautes Etudes Scientifiques (IHES)
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Scientific Computing and Computational Science
Perimeter Institute for Theoretical Physics
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Shape Dynamics Workshop
16 talks-Collection NumberC17015Talk
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Shape Dynamics: Perspectives and Problems
University of Oxford -
The quantum equation of state of the universe produces a small cosmological constant
Technical University of Applied Sciences Würzburg-Schweinfurt -
Inflationary and pre-inflationary dynamics with the Starobinsky potential
Radboud Universiteit Nijmegen -
Relationalism and the speed of light: Are we in a relationship?
Universidad Nacional Autónoma De Mexico (UNAM) -
Compact spherically symmetric solutions and gravitational collapse in SD
University of Naples Federico II -
Self-gravitating fluid solutions of Shape Dynamics
Conestoga College -
A Weyl-Type Theorem in Geometrized Newtonian Gravity, and How It May Bear on Shape Dynamics
Ludwig-Maximilians-Universitiät München (LMU) -
What we know and don’t know about solutions to the Einstein Constraint Equations
University of Oregon
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PSI 2016/2017 - Explorations in Quantum Gravity (Dupuis)
15 talks-Collection NumberC17010Talk
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PSI 2016/2017 - Explorations in Quantum Gravity - Lecture 1
Perimeter Institute for Theoretical Physics -
PSI 2016/2017 - Explorations in Quantum Gravity - Lecture 2
Perimeter Institute for Theoretical Physics -
PSI 2016/2017 - Explorations in Quantum Gravity - Lecture 3
Perimeter Institute for Theoretical Physics -
PSI 2016/2017 - Explorations in Quantum Gravity - Lecture 4
Perimeter Institute for Theoretical Physics -
PSI 2016/2017 - Explorations in Quantum Gravity - Lecture 5
Perimeter Institute for Theoretical Physics -
PSI 2016/2017 - Explorations in Quantum Gravity - Lecture 6
Perimeter Institute for Theoretical Physics -
PSI 2016/2017 - Explorations in Quantum Gravity - Lecture 7
Perimeter Institute for Theoretical Physics -
PSI 2016/2017 - Explorations in Quantum Gravity - Lecture 8
Perimeter Institute for Theoretical Physics
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Emmy Noether Workshop: The Structure of Quantum Space Time
25 talks-Collection NumberC19047Understanding the small-scale structure of spacetime is one of the biggest challenges faced by modern theoretical physics. There are many different attempts to solve this problem and they reflect the diversity of approaches to quantum gravity. This workshop will bring together researchers from a wide range of quantum gravity approaches and give them an opportunity to exchange ideas and gain new insights.
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Simplicity III
17 talks-Collection NumberC19044This cross-disciplinary workshop gathers theorists who have been working on novel approaches to understanding the structure of the Standard Model and its link to cosmology and gravity. It follows the previous Simplicity I and II workshops at Princeton University (2014) and Fermilab (2016) and will be a small informal meeting with plenty of room for discussions.
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PSI 2019/2020 - Relativity (Kubiznak)
15 talks-Collection NumberC19039PSI 2019/2020 - Relativity (Kubiznak) -
PSI 2019/2020 - Classical Physics (Kubiznak)
8 talks-Collection NumberC19032PSI 2019/2020 - Classical Physics (Kubiznak) -
PSI 2018/2019 - Explorations in Quantum Gravity (Dupuis)
15 talks-Collection NumberC19014PSI 2018/2019 - Explorations in Quantum Gravity (Dupuis) -
PSI 2017/2018 - Quantum Gravity (Dupuis)
15 talks-Collection NumberC17052PSI 2017/2018 - Quantum Gravity (Dupuis) -
The Path Integral for Gravity
18 talks-Collection NumberC17057Over the past three decades, the idea of a path integral over geometries, describing gravity in various dimensions, has become increasingly central to many areas of theoretical physics, including string and M-theory, holography and quantum aspects of black holes and cosmology.
In each of these areas, the path integral is frequently invoked as a formal device although, as practitioners will admit, except in very special cases the basic formula remains undefined. Typically, classical saddle points are discussed, whether real or complex, but the required integrals are left unperformed.
This state of affairs is untenable because it leaves the theory on a shaky footing and hence does not permit a sound comparison of theoretical predictions with observations. The time has come to critically reassess the foundational ideas of the path integral for gravity, including its definition, evaluation and interpretation; to identify problems with
existing uses and claims based on it, and to seek improvements. The workshop will focus on the continuum theory and its semiclassical limit, with applications to cosmology, black holes and holography. In particular, the notion of a “Euclidean path integral” for a “wavefunction of the universe” will be addressed.To this effect we intend to revisit discussion of “quantum geometrodynamics” from the path integral viewpoint and to pursue various applications. The developments in this direction that took place in the late 1970's and early 1980's were not incorporated in subsequent efforts, where the emphasis shifted to using a classical background with quantum fluctuations superimposed on it, a split which although useful in particular approximations can hardly be imagined to lie at the foundation of the theory. The revival of the discussion of the foundation of the path integral for gravity is made timely, we believe, by the introduction of new global methods such as Picard-Lefschetz theory.
The format of the workshop will be unusual. For the first three days, the mornings will begin with a longer, introductory lecture by each of the three organisers, setting out some of the foundational issues. This will be followed by shorter lectures by the participants, tackling the same foundational questions. The morning lectures, held in the Bob room, will be open to all Perimeter residents and visitors. They will be recorded and made available for viewing on PIRSA. Afternoons will be devoted to friendly and informal discussions, with participants invited to offer short contributions which follow up or develop points raised in the mornings, within a relaxed and highly conducive environment. Participation in these afternoon discussion sessions, as well as social events associated with the workshop, will be limited to registered workshop participants. The last two days of the workshop will be an opportunity for participants to continue discussions on topics which emerge as of greatest general interest, as well as to follow up in smaller groups on technical points or new ideas.
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Quantum Black Holes in the Sky?
34 talks-Collection NumberC17055The past decade has witnessed significant breakthroughs in understanding the quantum nature of black holes, with insights coming from quantum information theory, numerical relativity, and string theory. At the same time, astrophysical and gravitational wave observations can now provide an unprecedented window into the phenomenology of black hole horizons. This workshop seeks to bring together leading experts in these fields to explore new theoretical and observational opportunities and synergies that could improve our physical understanding of quantum black holes.
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Hopf Algebras in Kitaev's Quantum Double Models: Mathematical Connections from Gauge Theory to Topological Quantum Computing and Categorical Quantum Mechanics
18 talks-Collection NumberC17029The Kitaev quantum double models are a family of topologically ordered spin models originally proposed to exploit the novel condensed matter phenomenology of topological phases for fault-tolerant quantum computation. Their physics is inherited from topological quantum field theories, while their underlying mathematical structure is based on a class of Hopf algebras. This structure is also seen across diverse fields of physics, and so allows connections to be made between the Kitaev models and topics as varied as quantum gauge theory and modified strong complementarity. This workshop will explore this shared mathematical structure and in so doing develop the connections between the fields of mathematical physics, quantum gravity, quantum information, condensed matter and quantum foundations.
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Making Quantum Gravity Computable
31 talks-Collection NumberC17023Making Quantum Gravity Computable
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PSI 2016/2017 - Explorations in Quantum Gravity (Dupuis)
15 talks-Collection NumberC17010PSI 2016/2017 - Explorations in Quantum Gravity (Dupuis)