Johnson, Matthew

Matthew Johnson

Associate Professor
Associate Faculty, Perimeter Institute for Theoretical Physics
Ph.D. (UC Santa Cruz)
matthewj@yorku.ca

Department(s): Physics and Astronomy

Office: 322 Petrie Science & Engineering Building (PSE)
Phone: (416)736-2100 ext. 33747

Research Fields
Astronomy and Astrophysics, High Energy and Particle Physics

Graduate Program Appointment
Full Member: Eligible to supervise M.Sc. or Ph.D.

Research Types
Computational, Theoretical


Research specialization
Theoretical cosmology, especially cosmic inflation, eternal inflation, dark energy, and confrontations with observations; Field theory; String theory; Gravitation.


The goal of my research is to understand the fundamental laws of nature through their impact on cosmology. I am primarily a theorist, dabbling in cosmology, field theory, string theory, and gravitation. I am actively engaged in research on cosmic inflation, eternal inflation, topological defects, and models of dark energy. I also design data analysis algorithms to confront fundamental theory with observations of the Cosmic Microwave Background (CMB) radiation. Here is a sampling of the questions that drive my research: How big is the universe? What might lie beyond our observable universe, and how could we confirm or disprove various proposals? What role do the extra dimensions predicted by string theory play in cosmology? What is the fundamental nature of space-time singularities? Are there new ways of looking at cosmological datasets that could be useful when confronting theories with data? Can computer simulations of the very early universe shed light on its possible initial conditions and evolution?