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Ue-Li Pen Astrophysicist

Ue-Li Pen’s research focuses on the cosmic distribution of ordinary and dark matter. Until recently, there was no direct measurement of dark matter, and the vast majority of ordinary (baryonic) matter was unaccounted for. Recently, new tools, consisting of gravitational lensing and the Sunyaev-Zeldovich effect, have enabled mapping of the cosmic inventory and distribution. Since direct controlled experiments are difficult to perform on the universe, Pen utilizes massively parallel computers, including the McKenzie cluster at the Canadian Institute for Theoretical Astrophysics, to simulate and quantify the gravitational dynamics of dark and baryonic matter.


1st Place in Digital Equipment Co. and Pittsburgh Supercomputer Center Technical Computing Contest, 1995.

Princeton Porter Ogden Jacobus Fellowship, 1994.

Ray Grimm Computational Physics Prize, 1994.

Relevant Publications

U.L. Pen et al, "Power Spectra in Global Defect Theories of Cosmic Structure Formation," Phys. Rev. Lett., vol. 79, pp. 1611, Sept. 1997.



Senior Fellow Gravity & the Extreme Universe


University of TorontoCanadian Institute for Theoretical Astrophysics (CITA)


PhD (Astrophysical Sciences) Princeton University

MSc (Electrophysics) National Chiao-Tung University

BSc (Mathematics) National Taiwan University



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