2022-2023 Low Regularity Physics and Geometry Seminar

July 1, 2022 to June 30, 2023, The Fields Institute

Location: Online

Description

This seminar, which is part of the Thematic Program on Nonsmooth Riemannian and Lorentzian Geometry, meets in person at the Fields Institute in FL210 on Wednesday afternoons and is also open to watching online via Zoom. To encourage collaboration between postdocs and senior participants, the speakers will be paired:

2:00-3:00 pm: a senior speaker presents an introductory talk

3:30-4:30 pm: a junior speaker presents a related talk

All talks will be related in some way to the geometry and physics of general relativity in settings where there is low regularity and singularities may occur.

Organizers: Ghazal Geshnizjani, Robert McCann, Christina Sormani, and Mathias Braun

To learn more about this seminar, visit the seminar's webpage: https://sites.google.com/site/professorsormani/home/lorephygeseminar.

Schedule

Past Talks

Wednesday, December 14th, 2022
14:00 to 14:50	Intrinsic Flat Convergence of Spacetimes Christina Sormani, CUNYGC and Lehman College Location:Fields Institute, Room 210
15:10 to 16:00	Estimating the Intrinsic Flat Distance between Time Symmetric Spacetime Slices Brian Allen, Lehman College Location:

Wednesday, December 7th, 2022
14:00 to 14:50	Mathematical methods for self-gravitating fields: dispersion or collapse? Philippe G. LeFloch, Sorbonne University Location:Fields Institute, Room 210
15:10 to 16:00	Boundary of RCD spaces and RCD subspaces Xingyu Zhu, The Fields Institute Location:Fields Institute, Room 210

Wednesday, November 30th, 2022
14:00 to 14:50	Open problems for RCD spaces Shouhei Honda, Tohoku University, Mathematical Institute Location:Fields Institute, Room 210
15:10 to 16:00	Towards Analysis on Fractals: Piecewise $C^1$-Fractal Curves, Spectral Triples, and the Gromov-Hausdorff Propinquity Therese Landry, University of California Santa Barbara Location:Fields Institute, Room 210

Wednesday, November 23rd, 2022
14:00 to 14:50	Submetries of manifolds Vitali Kapovitch, University of Toronto Location:Fields, 210
15:10 to 16:00	Rigidity and stability results for mean convex subsets in $RCD$ spaces Christian Ketterer, University of Freiburg Location:Fields, 210

Wednesday, November 9th, 2022
14:00 to 14:50	Representing relativistic objects as aggregates of point-sources Iva Stavrov, Lewis & Clark College Location:Fields Institute, Room 230
15:10 to 16:00	Volume rigidity and filling minimality of convex bodies Elefterios Soultanis, IMAPP and Radboud University Location:Fields Institute, Room 230

Wednesday, November 2nd, 2022
14:00 to 14:50	Constructing Ricci flat gravitational instantons Hari Kunduri, Memorial University Location:Fields Institute, Room 230
15:10 to 16:00	Comparison geometry for substatic manifolds Stefano Borghini, University of Milano - Bicocca Location:Fields Institute, Room 230

Wednesday, October 26th, 2022
14:00 to 14:50	When is an Alexandrov space smoothable? Catherine Searle, Wichita State University Location:Fields Institute, Room 210
15:10 to 16:00	The L^2-completion of the space of Riemannian metrics is CAT(0) Nicola Cavallucci, Karlsruher Institut für Technologie Location:Fields Institute, Room 210

Wednesday, October 19th, 2022
14:00 to 14:50	Differentiating in a non-differentiable environment Nicola Gigli, SISSA Trieste Location:Fields Institute, Room 210
15:10 to 16:00	Parallel transport on non-collapsed RCD(K,N) spaces Emanuele Caputo, University of Jyväskylä Location:Fields Institute, Room 210

Wednesday, October 12th, 2022
14:00 to 14:50	The Maths and Physics of Cosmic Strings Ruth Gregory, King's College London Location:Fields Institute, Room 210
15:10 to 16:00	Low-regularity Lorentzian geometry (from an analytic perspective) Melanie Graf, University of Washington Location:Fields Institute, Room 210

Wednesday, September 28th, 2022
14:00 to 14:50	Some Rigorous Results about the Past and Future Behavior of Expanding Vacuum Spacetimes John Lott, University of California Berkeley Location:Fields Institute, Room 210
15:10 to 16:00	On the uniqueness problem of spacetime extensions Jan Sbierski (University of Oxford) Location:Fields Institute, Room 210

Wednesday, September 21st, 2022
14:00 to 14:50	On the topology of general cosmological models Eric Woolgar, University of Alberta Location:Fields Institute, Room 210
15:10 to 16:00	Decay of waves in gravitational solitons Sharmila Gunasekaran Location:Fields Institute, Room 210
16:10 to 17:10	Scalar curvature and spinors John Lott, University of California Berkeley Location:Fields Institute, Room 230

Wednesday, September 7th, 2022
14:00 to 14:50	Distribution-valued Ricci Bounds for Metric Measure Spaces Karl-Theodor Sturm, University of Bonn Location:Fields Institute, Room 230
15:10 to 16:00	Geometric Measure Theory on non smooth spaces with lower Ricci bounds Daniele Semola, University of Oxford Location:Fields Institute, Room 230

Wednesday, August 24th, 2022
14:00 to 15:00	Cosmic strings and distributions David Garfinkle, Oakland University Location:Fields Institute, Room 230
15:30 to 16:30	Remarks on the cosmological constant appearing as an initial condition for Milne-like spacetimes Eric Ling, The Fields Institute Location:Fields Institute, Room 230

Wednesday, August 17th, 2022
14:00 to 15:00	Numerical General Relativity Erik Schnetter, Perimeter Institute Location:Fields Institute, Room 230
15:30 to 16:30	Black holes as a tool to study the dynamics of spacetime Maxence Corman, Perimeter Institute Location:Fields Institute, Room 230

Wednesday, August 10th, 2022
14:00 to 15:00	The Penrose tiling, self-similar quasicrystals, and fundamental physics? Latham Boyle, Perimeter Institute Location:Fields Institute, Room 230
15:30 to 16:30	Lorentzian length spaces - a synthetic approach to Lorentzian geometry Clemens Saemann, University of Vienna Location:Fields Institute, Room 230

Wednesday, August 3rd, 2022
14:00 to 15:00	Rigidity of Riemannian Penrose inequality with corners Siyuan Lu, McGill University and McMaster University Location:Fields Institute, Room 230
15:30 to 16:30	Regularity and the A3w condition for Monge–Ampère type equations Cale Rankin, The Fields Institute Location:Fields Institute, Room 230

Wednesday, July 27th, 2022
14:00 to 15:00	Rigidity of Riemannian embeddings of discrete metric spaces. Boaz Klartag, Weizmann Institute of Science Location:Fields Institute, Room 230
15:30 to 16:30	Towards multi-dimensional localisation Krzysztof Ciosmak, University of Oxford Location:Fields Institute, Room 210

Wednesday, July 20th, 2022
14:00 to 15:00	A nonsmooth approach to Einstein's theory of gravity Robert McCann, University of Toronto Location:Fields Institute, Room 210
15:30 to 16:30	Timelike curvature-dimension conditions for Lorentzian spaces via Rényi's entropy Mathias Braun, University of Toronto Location:Fields Institute, Room 210

Wednesday, July 13th, 2022
14:00 to 15:00	Introduction to Cosmological Perturbation Theory Ghazal Geshnizjani, University of Waterloo Location:Fields Institute, Room 210
15:30 to 16:30	Stability of singularity-resolving effective theories of gravity Jerome Quintin, The Fields Institute Location:

Wednesday, July 6th, 2022
14:00 to 15:00	Welcome to Nonsmooth Riemannian and Lorentzian Geometry Christina Sormani, CUNYGC and Lehman College
15:30 to 16:30	An Introduction to Gromov-Hausdorff Convergence and Low Regularity Riemannian Geometry Jikang Wang Location:Fields Institute, Room 210