Understanding 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.
Format results
-
Welcome and Opening Remarks
Bianca Dittrich - Perimeter Institute for Theoretical Physics
-
Quantum Spacetime from Lattice Gravity à la CDT
Renate Loll - Radboud Universiteit Nijmegen
-
How complement maps can cure divergences
Sylvie Paycha - University of Potsdam
-
The gravitational Wilson loop and the non-Abelian Stokes' theorem
Reiko Toriumi - Okinawa Institute of Science and Technology Graduate University
-
The dynamics of difference
Lee Smolin - Perimeter Institute for Theoretical Physics
-
-
Probing fundamental physics with gravitational waves
Cecilia Chirenti - Universidade Federal do ABC
-
Implications of the Quantum Nature Space-time for the Big Bang and Black Holes
Abhay Ashtekar - Pennsylvania State University
-
The power of diversity - or why linking quantum gravity approaches could matter
Astrid Eichhorn - Universität Heidelberg
-
Angular momentum flux in Einstein-Maxwell theory
Beatrice Bonga - Radboud Universiteit Nijmegen
-
A possible causality-condition for causal sets: persistence of zero
Rafael Sorkin - Perimeter Institute for Theoretical Physics
-
We Don’t Live on Spatial Hypersurfaces, so Why Should Quantum Fields?
Yasaman Kouchekzadeh Yazdi - Dublin Institute For Advanced Studies
-
-
Quantum Spacetime from Lattice Gravity à la CDT
Renate Loll - Radboud Universiteit Nijmegen
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… -
How complement maps can cure divergences
Sylvie Paycha - University of Potsdam
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 give… -
The gravitational Wilson loop and the non-Abelian Stokes' theorem
Reiko Toriumi - Okinawa Institute of Science and Technology Graduate University
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 what… -
The dynamics of difference
Lee Smolin - Perimeter Institute for Theoretical Physics
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… -
Quantum reference frames for space and time
Flaminia Giacomini - ETH Zurich
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… -
Probing fundamental physics with gravitational waves
Cecilia Chirenti - Universidade Federal do ABC
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… -
Implications of the Quantum Nature Space-time for the Big Bang and Black Holes
Abhay Ashtekar - Pennsylvania State University
-
The power of diversity - or why linking quantum gravity approaches could matter
Astrid Eichhorn - Universität Heidelberg
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… -
Angular momentum flux in Einstein-Maxwell theory
Beatrice Bonga - Radboud Universiteit Nijmegen
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… -
A possible causality-condition for causal sets: persistence of zero
Rafael Sorkin - Perimeter Institute for Theoretical Physics
Within a histories-framework for quantum field theory, the condition of \bold{persistence of zero} (PoZ for short) tries to capture (a part of) the elusive idea that no cause can act outside its future lightcone. The PoZ condition, however, does not easily carry over to theories like gravity where… -
We Don’t Live on Spatial Hypersurfaces, so Why Should Quantum Fields?
Yasaman Kouchekzadeh Yazdi - Dublin Institute For Advanced Studies
I will discuss a number of ongoing efforts to understand quantum field properties in a manifestly spacetime framework. Entanglement entropy and causal set theory are among the topics that I will especially touch on.