Postdoctoral Fellow

University of Waterloo/Perimeter Institute for Theoretical Physics

Tim Johannsen


I am a Postdoctoral Fellow at the University of Waterloo and at Perimeter Institute for Theoretical Physics. I was a CITA National Fellow at the University of Waterloo in 2012-14. My research expertise lies in the areas of theoretical astrophysics, gravitation, and black holes. I study the nature of these compact objects, their environment, and their implications for fundamental theories such as general relativity. I design observational tests of general relativity in the strong-field regime and predict new observational signatures of black holes across the electromagnetic spectrum. My work involves a variety of both analytical and computational methods.


I am part of the science team of the Event Horizon Telescope, a planned global array of radio telescopes with the goal to take the first ever image of a black hole and to test Einsteinís theory of general relativity. Parts of my research were covered on the news and in my recent invited review. I am also part of the strong gravity science team of the Large Observatory For x-ray Timing (LOFT), a candidate for the M4 class mission of ESAís Cosmic Vision Program. LOFT will perform phase-resolved spectroscopy of galactic black holes on event horizon timescales and probe the equation of state of neutron stars. I also work with the results of current/past X-ray observatories such as the Rossi X-ray Timing Explorer, Chandra, and XMM-Newton, and I simulate measurements of future X-ray missions such as Astro-H and ATHENA+.


In Fall 2012, I taught part of the graduate class Advanced Topics in Astrophysics at the University of Waterloo.










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Dr. Tim Johannsen

Perimeter Institute for Theoretical Physics
31 Caroline Street North
Waterloo, Ontario N2L 2Y5, Canada