PERIMETER INSTITUTE RECORDED SEMINAR ARCHIVE
 | Welcome and Opening Remarks Speaker(s): Bianca Dittrich, Theo Johnson-Freyd, Sylvie Paycha, Katarzyna Rejzner, Anne Taormina, Reiko Toriumi
Abstract:
Date: 22/02/2021 - 9:50 am
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 | Towards Lorentzian quantum gravity via effective spin foams Speaker(s): Bianca Dittrich
Abstract: Euclidean quantum gravity approaches have a long history but suffer from a number of severe issues. This gives a strong motivation to develop Lorentzian approaches. Spin foams constitute an important such approach, which incorporate a rigorously derived discrete area spectrum.&... read more
Date: 28/01/2021 - 2:30 pm
Series: Quantum Gravity
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 | Tensor network description of 3D Quantum Gravity and Diffeomorphism Symmetry Speaker(s): Bianca Dittrich
Abstract: In contrast to the 4D case, there are well understood theories of quantum gravity for the 3D case. Indeed, 3D general relativity constitutes a topological field theory (of BF or equivalently Chern-Simons type) and can be quantized as such. The resulting quantum theory of gravity offers many i... read more
Date: 18/11/2020 - 9:00 am
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 | Welcome and Opening Remarks Speaker(s): Bianca Dittrich
Abstract:
Date: 13/07/2020 - 9:20 am
Collection: Quantum Gravity 2020
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 | Quantum Geometry vs. Quantum Gravity Speaker(s): Bianca Dittrich
Abstract: Quantizing 4D geometries leads to discrete area spectra. Such discrete area spectra are also suggested by the holographic principle and entropy counting for black holes.
Starting with this input of a discrete area spectrum I will construct a path integral for quantum gravity and discuss... read more
Date: 19/03/2020 - 2:30 pm
Series: Quantum Gravity
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 | PSI 2019/2020 - Quantum Gravity Part 1 - Lecture 6 Speaker(s): Bianca Dittrich
Abstract:
Date: 13/03/2020 - 9:00 am
Collection: PSI 2019/2020 - Quantum Gravity Part 1
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 | PSI 2019/2020 - Quantum Gravity Part 1 - Lecture 5 Speaker(s): Bianca Dittrich
Abstract:
Date: 11/03/2020 - 11:30 am
Collection: PSI 2019/2020 - Quantum Gravity Part 1
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 | PSI 2019/2020 - Quantum Gravity Part 1 - Lecture 4 Speaker(s): Bianca Dittrich
Abstract:
Date: 10/03/2020 - 11:15 am
Collection: PSI 2019/2020 - Quantum Gravity Part 1
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 | PSI 2019/2020 - Quantum Gravity Part 1 - Lecture 3 Speaker(s): Bianca Dittrich
Abstract:
Date: 06/03/2020 - 9:00 am
Collection: PSI 2019/2020 - Quantum Gravity Part 1
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 | PSI 2019/2020 - Quantum Gravity Part 1 - Lecture 2 Speaker(s): Bianca Dittrich
Abstract:
Date: 05/03/2020 - 9:00 am
Collection: PSI 2019/2020 - Quantum Gravity Part 1
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 | PSI 2019/2020 - Quantum Gravity Part 1 - Lecture 1 Speaker(s): Bianca Dittrich
Abstract:
Date: 03/03/2020 - 9:00 am
Collection: PSI 2019/2020 - Quantum Gravity Part 1
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 | PSI 2018/2019 - Explorations in Quantum Gravity - Lecture 1 Speaker(s): Bianca Dittrich, Maïté Dupuis
Abstract:
Introduction and overview by Bianca Dittrich on the different quantum gravity approaches. Date: 04/03/2019 - 10:15 am
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 | Observables and (no) time in quantum gravity Speaker(s): Bianca Dittrich
Abstract: I will explain the special requirements that observables have to satisfy in quantum gravity and how this affects deeply the notion of time. I will furthermore explore how the search for observables in classical gravity can inform the construction of a quantum theory of gravity.
Date: 01/08/2018 - 11:30 am
Collection: Foundations of Quantum Mechanics
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 | Semi-classical evaluation of the 3D gravity path integral and quasi-local holography Speaker(s): Bianca Dittrich
Abstract:
Date: 13/11/2017 - 11:35 am
Collection: The Path Integral for Gravity
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 | From 3D TQFTs to 4D models with defects Speaker(s): Bianca Dittrich
Abstract: I will explain a general strategy to lift (2+1)D topological phases, in particular string nets, to (3+1)D models with line defects. This allows a systematic construction of (3+1)D topological theories with defects, including an improved version of the Walker-Wang Model. It has also an interesting ap... read more
Date: 04/08/2017 - 11:00 am
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 | Tutorial: Coarse-graining of Spin Foams
Abstract:
Date: 22/06/2017 - 3:45 pm
Collection: Making Quantum Gravity Computable
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 | Coarse-graining of Spin Foams - 4 Speaker(s): Benjamin Bahr, Bianca Dittrich
Abstract:
Date: 22/06/2017 - 12:00 pm
Collection: Making Quantum Gravity Computable
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 | Coarse-graining of Spin Foams - 3 Speaker(s): Benjamin Bahr, Bianca Dittrich
Abstract:
Date: 22/06/2017 - 11:00 am
Collection: Making Quantum Gravity Computable
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 | Tutorial: Coarse-graining of Spin Foams
Abstract:
Date: 21/06/2017 - 3:45 pm
Collection: Making Quantum Gravity Computable
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 | Coarse-graining of Spin Foams - 2 Speaker(s): Benjamin Bahr, Bianca Dittrich
Abstract:
Date: 21/06/2017 - 12:00 pm
Collection: Making Quantum Gravity Computable
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 | Coarse-graining of Spin Foams - 1 Speaker(s): Benjamin Bahr, Bianca Dittrich
Abstract:
Date: 21/06/2017 - 11:00 am
Collection: Making Quantum Gravity Computable
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 | Welcome and Opening Remarks Speaker(s): Bianca Dittrich
Abstract:
Date: 19/06/2017 - 8:40 am
Collection: Making Quantum Gravity Computable
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 | Constructing Quantum Spacetime Speaker(s): Bianca Dittrich
Abstract: General relativity taught us that space time is dynamical and quantum theory posits that dynamical objects are quantum. Hence the Newtonian notion of space time as a passive stage where physics takes place needs to be replaced by a notion of quantum space time which is interacting with all other qua... read more
Date: 26/04/2017 - 2:00 pm
Series: Colloquium
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 | Self-dual quantum geometries and four-dimensional TQFTs with defects Speaker(s): Bianca Dittrich
Abstract: We apply the recently suggested strategy to lift state spaces and operators for (2+1)-dimensional topological quantum field theories to state spaces and operators for a (3+1)-dimensional TQFT with defects. We start from the (2+1)-dimensional Turaev-Viro theory and obtain a state space, consistent wi... read more
Date: 18/04/2017 - 10:00 am
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 | Entanglement Entropy in nonAbelian Gauge Theories Speaker(s): Bianca Dittrich
Abstract:
Date: 19/07/2016 - 4:00 pm
Collection: It from Qubit Summer School
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 | 3D Holography: from discretum to continuum Speaker(s): Bianca Dittrich
Abstract: TBA
Date: 21/08/2015 - 2:00 pm
Collection: Quantum Information in Quantum Gravity II
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 | Quantum Space Time Engineering Speaker(s): Bianca Dittrich
Abstract: Modern physics rests on two basic frameworks, quantum theory and general relativity. Quantum gravity aims to unify these two frameworks into one consistent theory. One can expect that such a formulation delivers in particular a novel understanding of space and time as quantum objects.
I will give... read more
Date: 08/04/2015 - 2:00 pm
Series: Colloquium
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 | PSI 2014/2015 - Quantum Gravity - Lecture 14 Speaker(s): Bianca Dittrich
Abstract:
Date: 06/03/2015 - 10:15 am
Collection: PSI 2014/2015 - Quantum Gravity (Dittrich)
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 | PSI 2014/2015 - Quantum Gravity - Lecture 13 Speaker(s): Bianca Dittrich
Abstract:
Date: 05/03/2015 - 10:15 am
Collection: PSI 2014/2015 - Quantum Gravity (Dittrich)
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 | PSI 2014/2015 - Quantum Gravity - Lecture 12 Speaker(s): Bianca Dittrich
Abstract:
Date: 04/03/2015 - 10:15 am
Collection: PSI 2014/2015 - Quantum Gravity (Dittrich)
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 | PSI 2014/2015 - Quantum Gravity - Lecture 11 Speaker(s): Bianca Dittrich
Abstract:
Date: 03/03/2015 - 10:15 am
Collection: PSI 2014/2015 - Quantum Gravity (Dittrich)
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 | PSI 2014/2015 - Quantum Gravity - Lecture 10 Speaker(s): Bianca Dittrich
Abstract:
Date: 02/03/2015 - 10:15 am
Collection: PSI 2014/2015 - Quantum Gravity (Dittrich)
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 | PSI 2014/2015 - Quantum Gravity - Lecture 9 Speaker(s): Bianca Dittrich
Abstract:
Date: 27/02/2015 - 10:15 am
Collection: PSI 2014/2015 - Quantum Gravity (Dittrich)
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 | PSI 2014/2015 - Quantum Gravity - Lecture 8 Speaker(s): Bianca Dittrich
Abstract:
Date: 26/02/2015 - 10:15 am
Collection: PSI 2014/2015 - Quantum Gravity (Dittrich)
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 | PSI 2014/2015 - Quantum Gravity - Lecture 7 Speaker(s): Bianca Dittrich
Abstract:
Date: 25/02/2015 - 10:15 am
Collection: PSI 2014/2015 - Quantum Gravity (Dittrich)
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 | PSI 2014/2015 - Quantum Gravity - Lecture 6 Speaker(s): Bianca Dittrich
Abstract:
Date: 24/02/2015 - 10:15 am
Collection: PSI 2014/2015 - Quantum Gravity (Dittrich)
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 | PSI 2014/2015 - Quantum Gravity - Lecture 5 Speaker(s): Bianca Dittrich
Abstract:
Date: 23/02/2015 - 10:15 am
Collection: PSI 2014/2015 - Quantum Gravity (Dittrich)
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 | PSI 2014/2015 - Quantum Gravity - Lecture 4 Speaker(s): Bianca Dittrich
Abstract:
Date: 20/02/2015 - 10:15 am
Collection: PSI 2014/2015 - Quantum Gravity (Dittrich)
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 | PSI 2014/2015 - Quantum Gravity - Lecture 3 Speaker(s): Bianca Dittrich
Abstract:
Date: 19/02/2015 - 10:15 am
Collection: PSI 2014/2015 - Quantum Gravity (Dittrich)
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 | PSI 2014/2015 - Quantum Gravity - Lecture 2 Speaker(s): Bianca Dittrich
Abstract:
Date: 18/02/2015 - 10:15 am
Collection: PSI 2014/2015 - Quantum Gravity (Dittrich)
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 | PSI 2014/2015 - Quantum Gravity - Lecture 1 Speaker(s): Bianca Dittrich
Abstract:
Date: 17/02/2015 - 10:15 am
Collection: PSI 2014/2015 - Quantum Gravity (Dittrich)
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 | New Vacuum and Representation For Loop Quantum Gravity Speaker(s): Bianca Dittrich
Abstract:
Date: 21/05/2014 - 1:20 pm
Collection: Quantum Gravity Day 2014
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 | Quantum Spacetime Engineering Speaker(s): Bianca Dittrich
Abstract: 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 t... read more
Date: 22/04/2014 - 3:20 pm
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 | 13/14 PSI - Quantum Gravity Review - Lecture 14 Speaker(s): Bianca Dittrich
Abstract:
Date: 07/03/2014 - 10:15 am
Collection: 13/14 PSI - Quantum Gravity Review
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 | 13/14 PSI - Quantum Gravity Review - Lecture 13 Speaker(s): Bianca Dittrich
Abstract:
Date: 06/03/2014 - 10:15 am
Collection: 13/14 PSI - Quantum Gravity Review
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 | 13/14 PSI - Quantum Gravity Review - Lecture 12 Speaker(s): Bianca Dittrich
Abstract:
Date: 05/03/2014 - 10:15 am
Collection: 13/14 PSI - Quantum Gravity Review
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 | 13/14 PSI - Quantum Gravity Review - Lecture 11 Speaker(s): Bianca Dittrich
Abstract:
Date: 04/03/2014 - 10:15 am
Collection: 13/14 PSI - Quantum Gravity Review
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 | 13/14 PSI - Quantum Gravity Review - Lecture 10 Speaker(s): Bianca Dittrich
Abstract:
Date: 03/03/2014 - 10:15 am
Collection: 13/14 PSI - Quantum Gravity Review
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 | 13/14 PSI - Quantum Gravity Review - Lecture 9 Speaker(s): Bianca Dittrich
Abstract:
Date: 28/02/2014 - 10:15 am
Collection: 13/14 PSI - Quantum Gravity Review
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 | 13/14 PSI - Quantum Gravity Review - Lecture 8 Speaker(s): Bianca Dittrich
Abstract:
Date: 27/02/2014 - 10:15 am
Collection: 13/14 PSI - Quantum Gravity Review
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 | 13/14 PSI - Quantum Gravity Review - Lecture 7 Speaker(s): Bianca Dittrich
Abstract:
Date: 26/02/2014 - 10:15 am
Collection: 13/14 PSI - Quantum Gravity Review
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 | 13/14 PSI - Quantum Gravity Review - Lecture 6 Speaker(s): Bianca Dittrich
Abstract:
Date: 25/02/2014 - 10:15 am
Collection: 13/14 PSI - Quantum Gravity Review
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 | 13/14 PSI - Quantum Gravity Review - Lecture 5 Speaker(s): Bianca Dittrich
Abstract:
Date: 24/02/2014 - 10:15 am
Collection: 13/14 PSI - Quantum Gravity Review
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 | 13/14 PSI - Quantum Gravity Review - Lecture 4 Speaker(s): Bianca Dittrich
Abstract:
Date: 21/02/2014 - 10:15 am
Collection: 13/14 PSI - Quantum Gravity Review
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 | 13/14 PSI - Quantum Gravity Review - Lecture 3 Speaker(s): Bianca Dittrich
Abstract:
Date: 20/02/2014 - 10:15 am
Collection: 13/14 PSI - Quantum Gravity Review
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 | 13/14 PSI - Quantum Gravity Review - Lecture 2 Speaker(s): Bianca Dittrich
Abstract:
Date: 19/02/2014 - 10:15 am
Collection: 13/14 PSI - Quantum Gravity Review
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 | 13/14 PSI - Quantum Gravity Review - Lecture 1 Speaker(s): Bianca Dittrich
Abstract:
Date: 18/02/2014 - 10:15 am
Collection: 13/14 PSI - Quantum Gravity Review
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 | Constructing Quantum Space Time Speaker(s): Bianca Dittrich
Abstract:
Date: 30/01/2014 - 2:45 pm
Collection: PI Day 2014
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 | From spin foams to anyons and back again - Joint Condensed Matter/Quantum Gravity Seminar Speaker(s): Bianca Dittrich
Abstract: Spin foams provide models for quantum gravity and hence quantum space time. One of the key outstanding questions is to show that they reproduce smooth space time manifolds in a continuum limit.I will start with a very short introduction to spin foams and the structure of quantum space time they enco... read more
Date: 05/12/2013 - 2:30 pm
Series: Quantum Gravity
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 | 12/13 PSI - Quantum Gravity Review Lecture 14 Speaker(s): Bianca Dittrich
Abstract:
Date: 15/02/2013 - 10:15 am
Collection: 12/13 PSI - Quantum Gravity Review
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 | 12/13 PSI - Quantum Gravity Review Lecture 13 Speaker(s): Bianca Dittrich
Abstract:
Date: 14/02/2013 - 10:15 am
Collection: 12/13 PSI - Quantum Gravity Review
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 | 12/13 PSI - Quantum Gravity Review Lecture 12 Speaker(s): Bianca Dittrich
Abstract:
Date: 13/02/2013 - 10:15 am
Collection: 12/13 PSI - Quantum Gravity Review
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 | 12/13 PSI - Quantum Gravity Review Lecture 11 Speaker(s): Bianca Dittrich
Abstract:
Date: 12/02/2013 - 10:15 am
Collection: 12/13 PSI - Quantum Gravity Review
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 | 12/13 PSI - Quantum Gravity Review Lecture 10 Speaker(s): Bianca Dittrich
Abstract:
Date: 11/02/2013 - 10:15 am
Collection: 12/13 PSI - Quantum Gravity Review
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 | 12/13 PSI - Quantum Gravity Review Lecture 9 Speaker(s): Bianca Dittrich
Abstract:
Date: 07/02/2013 - 10:15 am
Collection: 12/13 PSI - Quantum Gravity Review
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 | 12/13 PSI - Quantum Gravity Review Lecture 8 Speaker(s): Bianca Dittrich
Abstract:
Date: 06/02/2013 - 10:15 am
Collection: 12/13 PSI - Quantum Gravity Review
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 | 12/13 PSI - Quantum Gravity Review Lecture 7 Speaker(s): Bianca Dittrich
Abstract:
Date: 05/02/2013 - 10:15 am
Collection: 12/13 PSI - Quantum Gravity Review
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 | 12/13 PSI - Quantum Gravity Review Lecture 6 Speaker(s): Bianca Dittrich
Abstract:
Date: 04/02/2013 - 10:15 am
Collection: 12/13 PSI - Quantum Gravity Review
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 | 12/13 PSI - Quantum Gravity Review Lecture 5 Speaker(s): Bianca Dittrich
Abstract:
Date: 01/02/2013 - 10:15 am
Collection: 12/13 PSI - Quantum Gravity Review
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 | 12/13 PSI - Quantum Gravity Review Lecture 4 Speaker(s): Bianca Dittrich
Abstract:
Date: 31/01/2013 - 10:15 am
Collection: 12/13 PSI - Quantum Gravity Review
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 | 12/13 PSI - Quantum Gravity Review Lecture 3 Speaker(s): Bianca Dittrich
Abstract:
Date: 30/01/2013 - 10:15 am
Collection: 12/13 PSI - Quantum Gravity Review
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 | 12/13 PSI - Quantum Gravity Review Lecture 2 Speaker(s): Bianca Dittrich
Abstract:
Date: 29/01/2013 - 10:15 am
Collection: 12/13 PSI - Quantum Gravity Review
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 | 12/13 PSI - Quantum Gravity Review Lecture 1 Speaker(s): Bianca Dittrich
Abstract:
Date: 28/01/2013 - 10:15 am
Collection: 12/13 PSI - Quantum Gravity Review
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 | Is spacetime fundamentally discrete?
Abstract: Modelling continuum dynamics on
discrete space timeWe will discuss perfect discretizations which aim at mirroring exactly continuum physics on a given lattice. Such discretizations avoid typical artifacts like Lorentz violation, energy dissipation, particle doubling and in particular breaking of di... read more
Date: 24/10/2012 - 9:00 am
Collection: Experimental Search for Quantum Gravity 2007
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 | Coarse graining spin nets with tensor networks Speaker(s): Bianca Dittrich
Abstract:
Date: 09/02/2012 - 10:20 am
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 | Geometro-kinematics and dynamics in a discrete setting Speaker(s): Bianca Dittrich
Abstract: A quantum theory of gravity implies a quantum theory of geometries. To
this end we will introduce different phases spaces and choices for the
space of discretized geometries. These are derived through a canonical
analysis of simplicity constraints - which are central for spin foam
models - a... read more
Date: 25/03/2010 - 2:30 pm
Series: Quantum Gravity
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 | Diffeomorphism symmetry, triangulation independence and constraints in discrete gravity Speaker(s): Bianca Dittrich
Abstract: Diffeomorphism symmetry is the underlying symmetry of general
relativity and deeply intertwined with its dynamics. The notion of
diffeomorphism symmetry is however obscured in discrete gravity, which
underlies most of the current quantum gravity models. We will propose
a notion of diffeomorp... read more
Date: 24/03/2010 - 4:00 pm
Series: Quantum Gravity
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 | Implications of background independence for quantum gravity Speaker(s): Bianca Dittrich
Abstract: We will give a short overview of non-perturbative quantum gravity
models and discuss some key common problems for these models. In
particular we will analyze what background independence requires from
a theory of quantum gravity.
Date: 23/03/2010 - 12:30 pm
Series: Quantum Gravity
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 | Introduction to Quantum Gravity Speaker(s): Bianca Dittrich
Abstract:
Date: 06/12/2007 - 11:00 am
Collection: Young Researchers Conference - 2007
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 | A Hamiltonian framework for cosmological perturbations to any order Speaker(s): Bianca Dittrich
Abstract: We introduce a framework that allows to calculate cosmological perturbations in a gauge invariant manner to any order. The two main features of this framework are to take physical observables as basic objects and to treat the variables describing the background geometry as fully dynamical. Backreact... read more
Date: 01/05/2007 - 11:00 am
Series: Cosmology & Gravitation
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 | Status of the Master Constraint Programme Speaker(s): Bianca Dittrich
Abstract:
Date: 30/10/2004 - 2:35 pm
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