May 31–June 5, 2026
ASTROPHYSICS · COSMOLOGY · GRAVITY
Curiosity at the edge of the universe.
I am an astrophysicist and professor at the University of Waterloo, and Associate Faculty at Perimeter Institute. My work looks for observational clues to the deepest questions in fundamental physics.
RESEARCH
Following the evidence where it leads.
From black holes and the early universe to dark energy and the cosmic microwave background, the questions are connected by a common aim: making fundamental physics answerable to observation.
All research areas ↗Big Mysteries dashboard ↗- 01Quantum black holes & horizon physics
- 02Gravitational-wave astronomy & black-hole spectroscopy
- 03The Big Bang, early universe & quantum cosmology
- 04Dark energy & modified gravity
- 05Dark matter, galaxies & nonlinear structure
- 06Cosmic gas, the CMB & missing baryons
- 07Compact objects, accretion disks & electromagnetic probes
- 08Quantum spacetime, analogue gravity & foundations
- 09Medical physics & radiotherapy
- 10Epidemiology & public-health modelling
CURRENTLY
Recent writing & announcements
BOOK
Battle of the Big Bang
The New Tales of Our Cosmic Origins
A guided tour through competing ideas about cosmic origins—from bouncing and cyclic universes to black-hole births, multiverses, holograms, and the possibility that the Big Bang was not the beginning.
Book page & media archive ↗PUBLICATIONS
Research papers & preprints ↗
Browse a complete scholarly record through the field's leading indexes, or explore selected work in the research archive.
THE GROUP
People make the questions sharper.
- Alice Chen
- Ruolin Liu
- Hassan Subhi
- Shokoufe Faraji
- Ohoud K. Alharbi
- Harrison (Haoye) Li
- Robin Oberfrank
- Aliv Sahoo
- Yusuke Manita
- Batia Friedman-Shaw
TALKS & OUTREACH
Conversations about cosmology, fundamental physics, and how science works.
April 16, 2025
Copenhagen Survey on Black Holes and Fundamental Physics
IPM Physics Colloquium · Institute for Research in Fundamental SciencesJuly 24, 2024
Imaging Quantum Black Holes & (Towards) Optimal Estimators of Stochastic Gravitational Wave Background
The 1st Tsinghua Relativity WorkshopJanuary 29–March 1, 2024