University of Waterloo
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My research seeks to sharpen the contact between experimental data and our basic theoretical understanding of Nature. Below are summarized three of my primary interests: understanding the implications of TeV-scale data for physics beyond the Standard Model, probing new physics very weakly coupled to ordinary matter, and developing a framework in which to test the Lorentz-transformation properties of massless particles.
We are in the midst of an exciting era --- experimental data from the LHC and dark matter searches offer hints to the nature of dark matter, the completion of the Standard Model, and any new physics at the TeV-scale that may explain the electroweak-Planck hierarchy. One aim of my research is to understand, from these hints, the underlying structure of new physics and to propose new directions of experimental study.
A complementary approach is to search for new physics that couples rather weakly to ordinary matter (but could potentially interact significantly with dark matter or other, still-unknown physics). Such physics could be manifest through new forces mediated by light particles, which can be readily searched for with present technology. To this end, I am involved in the APEX and HPS experiments at Jefferson Lab which aim to explore a large parameter region for such physics in the next several years.
I have recently started exploring the possibility that massless "continuous-spin" particles could consistently mediate long-range forces. These particles would behave much like ordinary photons or gravitons, except that their polarizations transform under the Lorentz symmetry of special relativity. The ultimate goal of this work is to learn whether "continuous-spin" generalizations of electromagnetism and gravity are theoretically consistent, and if they are, how they can be tested experimentally.