Strong Gravity research at Perimeter Institute is devoted to understanding both the theoretical and observational aspects of systems in which gravity is very strong (i.e., spacetime is highly curved or dynamical],. On one hand, this means studying extreme astrophysical systems, like black holes and neutron stars, as well as making and testing predictions for existing and forthcoming gravitational wave detectors, electromagnetic telescopes, and particle astrophysics experiments. On the other hand, it also includes a range of nonastrophysical topics, such as the instabilities of higherdimensional black holes or the dynamics of stronglycoupled quantum field theories (via holography). The goal of strong gravity researcher is to test the validity of Einstein's theory of gravity, constrain proposed alternatives, understand the most extreme astrophysical systems, and investigate the ways in which highly curved or dynamical spacetimes are linked with a range of other problems in fundamental physics.
Format results

Adam Solomon, Andrew Tolley, Astrid Eichhorn, Sergey Sibiryakov

Against Horndeski
McMaster University 
Extending EFT of inflation/dark energy to arbitrary background with timelike scalar profile
Yukawa Institute for Theoretical Physics 
Galileon Duality and its Generalizations
Imperial College London 
PostNewtonian limit of Lorentzviolating scalartensor theories
Rikkyo University 
Town Hall  New generation of LSS surveys and modified gravity/dark energy
Hanyu Zhang, Jessie Muir, Kazuya Koyama, Martin Kunz 
Testing screened modified gravity models
University of Portsmouth 
Nonlinear dark energy simulations
University of Geneva 
Beyond Horndeski theories
Université Paris Cité 
Gravitational wave generation in effective field theories of dark energy
SISSA International School for Advanced Studies 
Town Hall  Modified gravity strong field regime
Enrico Barausse, Laura Bernard, Maxence Corman, Suvendu Giri 
Black hole binaries in EinsteinscalarGaussBonnet gravity and their effectiveonebody description
Max Planck Institute for Gravitational Physics