Emmy Noether Workshop: The Structure of Quantum Space Time

Conference Date: 
Monday, November 18, 2019 (All day) to Friday, November 22, 2019 (All day)
Scientific Areas: 
Cosmology
Quantum Fields and Strings
Quantum Gravity

 

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.

Funding for this workshop has been provided by the Simons Foundation.

  • Abhay Ashtekar, Pennsylvania State University
  • Dorothea Bahns, University of Goettingen
  • Beatrice Bonga, Perimeter Institute
  • Steve Carlip, University of California, Davis
  • Alejandra Castro, University of Amsterdam
  • Lin-Qing Chen, Okinawa Institute of Science and Technology
  • Cecilia Chirenti, Federal University of ABC
  • Marina Cortes, University of Edinburgh 
  • Maïté Dupuis, Perimeter Institute
  • Astrid Eichhorn, Heidelberg University & University of Southern Denmark
  • Netta Engelhardt, Princeton University
  • Valentina Forini, City Universtiy of London
  • Lisa Glaser, Radboud University of Nijmegen
  • Ruth Gregory, Durham University
  • Ted Jacobson, University of Maryland
  • Wei Li, Chinese Academy of Sciences
  • Renate Loll, Radboud University of Nijmegen
  • Catherine Meusburger, Friedrich-Alexander-Universität Erlangen-Nürnberg
  • Sylvie Paycha, University of Postdam
  • Nicola Pinamonti, University of Genova
  • Mairi Sakellariadou, Kings College London
  • Lee Smolin, Perimeter Institute
  • Rafael Sorkin, Perimeter Institute
  • Reiko Toriumi, Okinawa Institute of Science and Technology
  • Yasaman Yazdi, Imperial College London
  • Seth Asante, Perimeter Institute
  • Sylvain Carrozza, Perimeter Institute
  • Pierre Clavier, University of Potsdam
  • Alfonso Garmendia, University of Potsdam
  • Flaminia Giacomini, Perimeter Institute
  • Ian Jubb, Imperial College London
  • Benjamin Knorr, Perimeter Institute
  • Maria Julia Maristany, Perimeter Institute
  • Melissa Rodriguez Zarate, Perimeter Institute
  • Nitica Sakharwade, Perimeter Institute
  • Krishan Saraswat, Perimeter Institute
  • Barak Shoshany, Perimeter Institute
  • Filip Simovic, Perimeter Institute & University of Waterloo
  • Alexander Spies, Friedrich-Alexander-Universität Erlangen-Nürnberg
  • Sebastian Steinhaus, Perimeter Institute
  • Thomas Voss, Friedrich-Alexander-Universität Erlangen-Nürnberg

Monday, November 18, 2019

Time

Event

Location

9:00 – 9:25am

Registration

Reception

9:25 – 9:30am

Bianca Dittrich, Perimeter Institute
Welcome and Opening Remarks

Bob Room

9:30 – 10:20am

Renate Loll, Radboud University of Nijmegen

Bob Room

10:20 – 11:10am

Sylvie Paycha, University of Potsdam

Bob Room

11:10 – 11:40am

Coffee Break

Bistro – 1st Floor

11:40 – 12:30pm

Reiko Toriumi, Okinawa Institute of Science and Technology

Bob Room

12:30 – 2:00pm

Lunch

Bistro – 2nd Floor

2:00 – 2:50pm

Lee Smolin, Perimeter Institute

Bob Room

2:50 – 3:40pm

Maïté Dupuis, Perimeter Institute

Bob Room

3:40 – 4:10pm

Coffee Break

Bistro – 1st Floor

4:10 – 5:00pm

Cecilia Chirenti, Federal University of ABC

Bob Room

 

Tuesday, November 19, 2019

Time

Event

Location

9:30 – 10:20am

Abhay Ashtekar, Pennsylvania State University

Bob Room

10:20 – 11:10am

Astrid Eichhorn,
Heidelberg University & University of Southern Denmark

Bob Room

11:10 – 11:40am

Coffee Break

Bistro – 1st Floor

11:40 – 12:30pm

Beatrice Bonga, Perimeter Institute
Angular momentum flux in Einstein-Maxwell theory

Bob Room

12:30 – 2:00pm

Lunch

Bistro – 2nd Floor

2:00 – 2:50pm

Rafael Sorkin, Perimeter Institute

Bob Room

2:50 – 3:40pm

Yasaman Yazdi, Imperial College London

Bob Room

3:40 – 4:10pm

Coffee Break

Bistro – 1st Floor

4:10 – 5:30pm

Discussion on Quantum Gravity

Bob Room

 

Wednesday, November 20, 2019

Time

Event

Location

9:30 – 10:20am

Mairi Sakellariadou, Kings College London

Bob Room

10:20 – 11:10am

Ruth Gregory, Durham University

Bob Room

11:10 – 11:40am

Coffee Break

Bistro – 1st Floor

11:40 – 12:30pm

Alejandra Castro, University of Amsterdam

Bob Room

12:30 – 2:00pm

Lunch

Bistro – 2nd Floor

2:00 – 3:30pm

Colloquium
Catherine Meusburger,
Friedrich-Alexander-Universität Erlangen-Nürnberg
Ideal tetrahedra and their duals

Theater

3:30 – 4:00pm

Coffee Break

Bistro – 1st Floor

4:00 – 5:30pm

Panel Discussion:  Women in Science

Sky Room

6:00 – 9:00pm

FemPhys Mentoring night

Sky Room

 

Thursday, November 21, 2019

Time

Event

Location

9:30 – 10:20am

Dorothea Bahns, University of Goettingen

Bob Room

10:20 – 11:10am

Nicola Pinamonti, University of Genova
Semiclassical Einstein equations in cosmological spacetimes

Bob Room

11:10 – 11:40am

Coffee Break

Bistro – 1st Floor

11:40 – 12:30pm

Valentina Forini, City University of London

Bob Room

12:30 – 2:00pm

Lunch

Bistro – 2nd Floor

2:00 – 2:50pm

Steven Carlip, University of California, Davis

Bob Room

2:50 – 3:40pm

Lisa Glaser, Radboud University of Nijmegen

Bob Room

3:40 – 4:10pm

Coffee Break

Bistro – 1st Floor

4:10 – 5:30pm

Gong Show

Bob Room

6:00 – 9:00pm

Banquet

Bistro – 2nd Floor

 

Friday, November 22, 2019

Time

Event

Location

9:30 – 10:20am

Netta Engelhardt, Princeton University

Bob Room

10:20 – 11:10am

Wei Li, Chinese Academy of Sciences

Bob Room

11:10 – 11:40am

Coffee Break

Bistro – 1st Floor

11:40 – 12:30pm

Lin-Qing Chen, Okinawa Institute of Science and Technology

Bob Room

12:30 – 2:00pm

Lunch

Bistro – 2nd Floor

2:00 – 2:50pm

Ted Jacobson, University of Maryland

Bob Room

2:50 – 3:40pm

Marina Cortes, University of Edinburgh

Bob Room

3:40 – 4:10pm

Coffee Break

Bistro – 1st Floor

4:10 – 5:30pm

Closing Discussion

Bob Room

 

Beatrice Bonga, Perimeter Institute

Angular momentum flux in Einstein-Maxwell theory

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 of the flux associated with an asymptotic Lorentz symmetry, but also qualitatively: the stress flux contains both radiative and Coulombic information, whereas Noether and canonical ones are purely radiative.
While all methods are equally valid and have their own range of usefulness, it is reasonable to ask if one definition is more natural than the other. In order to answer this question, we turn to general relativity. With Maxwell theory coupled to gravity, we use the Wald-Zoupas formalism to obtain an expression for the flux of angular momentum and find that it is purely radiative. When the gravitational field is ``frozen'', the Wald-Zoupas flux reduces to the Noether flux.

Catherine Meusburger, Friedrich-Alexander-Universität Erlangen-Nürnberg

Ideal tetrahedra and their duals

Ideal tetrahedra play an important role in 3d hyperbolic geometry, in the construction of hyperbolic 3-manifolds and in the computation of their volumes.
Recently they have been generalized to other 3d homogeneous spaces, namely 3d anti de Sitter space and half-pipe space, a 3d homogeneous space with a degenerate metric.
We show that generalized ideal tetrahedra correspond to dual tetrahedra in 3d Minkowski, de Sitter and anti de Sitter space. They are those geodesic tetrahedra whose faces are all lightlike.
We investigate the geometrical properties of these dual tetrahedra in a unifi ed framework.  We then apply these results to obtain a volume formula for generalised ideal tetrahedra and their duals, in terms of their dihedral angles and their edge lengths.
This is joint work with Dr Carlos Scarinci, KIAS.
 
Nicola Pinamonti, University of Genova
 
Semiclassical Einstein equations in cosmological spacetimes
 
During this talk we shall discuss the backreaction of quantum matter fields on classical backgrounds by means of the semiclassical Einstein equation. 
We shall see that self consistent solutions of this coupled system exist in the case of cosmological spacetimes. 
Furthermore, Einstein equations governing the backreaction will transfer quantum matter fluctuations to the metric. 
 

Scientific Organizers:

  • Bianca Dittrich, Perimeter Institute
  • Katarzyna Rejzner, University of York
  • Sumati Surya, Raman Research Institute