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PERIMETER INSTITUTE RECORDED SEMINAR ARCHIVE

PIRSA:C19047 - Emmy Noether Workshop: The Structure of Quantum Space TimePODCAST Subscribe to podcast

Emmy Noether Workshop: The Structure of Quantum Space Time

Organizer(s): Bianca Dittrich   Katarzyna Rejzner   Sumati Surya  

Collection URL: http://pirsa.org/C19047


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PIRSA:19110083  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Welcome and Opening Remarks
Speaker(s): Bianca Dittrich
Abstract:
Date: 18/11/2019 - 9:25 am

PIRSA:19110084  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Quantum Spacetime from Lattice Gravity à la CDT
Speaker(s): Renate Loll
Abstract: Causal Dynamical Triangulations (CDT) is a candidate theory for quantum gravity, formulated nonperturbatively as the scaling limit of a lattice theory in terms of triangulated spacetimes. An important feature of this approach is its elegant resolution of the problem of diffeomorphism symmetry in the... read more
Date: 18/11/2019 - 9:30 am

PIRSA:19110085  ( MP4 Medium Res , MP3 , PDF ) Which Format?
How complement maps can cure divergences
Speaker(s): Sylvie Paycha
Abstract: Complements offer a separating device which proves useful for renormalisation purposes. A set and its set complement are disjoint, a vector space and its orthogonal complement have trivial intersection. Inspired by J. Pommersheim and S. Garoufalidis, we define a class of complement maps which gi... read more
Date: 18/11/2019 - 10:20 am

PIRSA:19110086  ( MP4 Medium Res , MP3 , PDF ) Which Format?
The gravitational Wilson loop and the non-Abelian Stokes' theorem
Speaker(s): Reiko Toriumi
Abstract: Finding suitable diffeomorphism-invariant observables to probe gravity at the Planck scale is essential in quantum gravity. The Wilson loop of the 4-dimensional Christoffel connection is a potentially interesting ingredient for the construction of such an observable. We have investigated to wha... read more
Date: 18/11/2019 - 11:40 am

PIRSA:19110087  ( MP4 Medium Res , MP3 , PDF ) Which Format?
The dynamics of difference
Speaker(s): Lee Smolin
Abstract: A proposal is made for a fundamental theory, which is hypothesized to be a completion of both quantum mechanics and general relativity, in which the history of the universe is constituted of diverse views of itself. Views are attributes of events, and the theory’s only be-ables; they comprise info... read more
Date: 18/11/2019 - 2:00 pm

PIRSA:19110112  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Quantum reference frames for space and time
Speaker(s): Flaminia Giacomini
Abstract: In physics, every observation is made with respect to a frame of reference. Although reference frames are usually not considered as degrees of freedom, in all practical situations it is a physical system which constitutes a reference frame. Can a quantum system be considered as a reference frame and... read more
Date: 18/11/2019 - 2:50 pm

PIRSA:19110089  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Probing fundamental physics with gravitational waves
Speaker(s): Cecilia Chirenti
Abstract: According to general relativity, the coalescence of a compact binary system creates a gravitational wave signal generically described by an inspiral-merger-ringdown waveform. The recent observations of gravitational waves by LIGO allow us to test our theory of gravity in the strong field regime. In ... read more
Date: 18/11/2019 - 4:10 pm

PIRSA:19110090  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Implications of the Quantum Nature Space-time for the Big Bang and Black Holes
Speaker(s): Abhay Ashtekar
Abstract:
Date: 19/11/2019 - 9:30 am

PIRSA:19110091  ( MP4 Medium Res , MP3 , PDF ) Which Format?
The power of diversity - or why linking quantum gravity approaches could matter
Speaker(s): Astrid Eichhorn
Abstract: Linking quantum gravity approaches could be important to make progress in quantum gravity. In my talk, I will try to make this case using asymptotically safe gravity as an example. I will briefly review the status of the approach and highlight the open questions, and discuss proposed ideas how the l... read more
Date: 19/11/2019 - 10:20 am

PIRSA:19110092  ( MP4 Medium Res , MP3 , PDF ) Which Format?
Angular momentum flux in Einstein-Maxwell theory
Speaker(s): Beatrice Bonga
Abstract: There are three natural currents for Maxwell theory on a non-dynamical background: the stress, Noether and canonical current. Their associated fluxes across null infinity differ by boundary terms for asymptotically flat spacetimes. These boundary terms do not only quantitatively change the behavior ... read more
Date: 19/11/2019 - 11:40 am

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