Recent years have seen a flood of new data, from gravitational wave observations of merging black holes and neutron stars to precision probes of cosmology, which allow for unprecedented tests of our understanding of gravity. Going handinhand with this, there has been significant recent progress on the theoretical side in terms of formulating modified theories of gravity, and using them to make detailed predictions, including in the nonlinear and dynamical regime, which can be confronted with the observations.
We are excited to announce a landmark conference that plans to delve into the forefront of research on modified theories of gravity and brings together leading experts from different disciplines including observational astrophysicists, numerical relativists, cosmologists and mathematical physicists to explore the present status of modified theories of gravity and envision their future theoretical development and implications for observations.
This conference is also timed to coincide with the 50th anniversary of pioneering work in this area carried out by Gregory Horndeski in the Waterloo Mathematical Physics Community. Hosted jointly by Perimeter Institute and the University of Waterloo, this conference will serve as a forum for researchers from different disciplines to exchange ideas at the cutting
edge of gravitational physics.
Presented by:
Sponsored in part by Gravity Theory Trust
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Topics:
• Modified Gravity Theories: Theoretical Framework and Models
• Tests of modified Gravity with Gravitational Waves (LIGO/LISA/PTA)
• Astrophysical/cosmological tests of gravity
• Mathematical structure of Modified gravity
• Observational tests of quantum gravity
• Modified gravity in the early universe
Conference Structure:
The conference will feature a balanced blend of plenary sessions (invited Speakers), contributed talks, panel discussions and poster presentations for students.
• Keynote presentations by renowned physicists in the field, discussing the impact of Horndeski theories and other modified theories of gravity on cosmology, dark energy, and black hole physics.
• Contributed talks: prioritizing earlycareer researchers
• Panel discussions on emerging research directions, unresolved questions, and potential applications of Horndeski theories.
• Poster sessions for earlycareer researchers and graduate students to showcase their work and receive feedback from senior scientists.
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Scientific Organizers:
 Ghazal Geshnizjani (Perimeter Institute, SOC Chair)
 William East (Perimeter Institute)
 Levon Pogosian (Simon Fraser University, Perimeter Institute Affiliate)
 Niayesh Afshordi (Perimeter Institute, U Waterloo, LOC Chair)
 Will Percival (Perimeter Institute, U Waterloo)
 Florian Girelli (U Waterloo, Perimeter Institute Affiliate)
 Jerome Quintin (U Waterloo, Perimeter Institute)
 Alex Krolewski (U Waterloo, Perimeter Institute, CITA)
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Format results

Extending EFT of inflation/dark energy to arbitrary background with timelike scalar profile
Shinji Mukohyama Yukawa Institute for Theoretical Physics

Against Horndeski
Cliff Burgess McMaster University

Bouncing cosmology; a solution to the singularity problem and more.
Amirhossein Dehghanizadeh The University of Waterloo
PIRSA:24070073 

How to study modified gravity as a particle theory and not collapse in the process
Sergio SevillanoMunoz Durham University
PIRSA:24070074 
Scattering amplitudes in highenergy limit of projectable Horava gravity
Jury Radkovski Perimeter Institute for Theoretical Physics
PIRSA:24070094 

Town Hall  Fundamental aspects of Modified gravity
Adam Solomon, Andrew Tolley, Astrid Eichhorn, Sergey Sibiryakov 
Simulating a Quantised Black Hole
Ruth Gregory King's College London

Probing quantum gravity at all scales
Astrid Eichhorn University of Southern Denmark

Production of Solar Scalars
AnneChristine Davis University of Cambridge
