Clifford W. Cheung

Clifford W. Cheung is a Professor of Theoretical Physics and Director of the Leinweber Forum for Theoretical Physics at the California Institute of Technology, within the Division of Physics, Mathematics and Astronomy. He holds a B.S. from Yale University, an M.A. from Harvard University, and a Ph.D. He served as an Assistant Professor at Caltech from 2012 to 2019 and was appointed Professor in 2019. He also became Director in 2025. His research interests are in physics.

Clifford Cheung is a Professor of Theoretical Physics at the California Institute of Technology, specializing in theoretical high-energy physics. His research focuses on the theoretical foundations of particle physics, including the study of scattering amplitudes, effective field theories, and the implications of quantum field theory for cosmology and gravity. He has contributed to the understanding of inflationary cosmology, dark matter, and the structure of the Standard Model. His work explores the connections between scattering amplitudes and classical potentials, the role of symmetries in quantum field theories, and the consistency relations in inflationary models. Cheung's research also addresses the weak gravity conjecture and the naturalness of physical theories.