Graduate student Mark Ho-Yeuk Cheung is the lead author of a Physical Review Letters publication that shows how the remnant black hole formed in the aftermath of the collision of two black holes would send gravitational waves through the cosmos. Postdoctoral Fellow Thomas Helfer, Professor Emanuele Berti, Postdoctoral Fellow Roberto Cotesta and two former Hopkins Ph.D. Students (Kaze Wong and Vishal Baibhav) are co-authors of the paper. This research finds evidence for the nonlinear effects predicted by Einstein’s theory of general relativity, and it has been selected for a “Physics Viewpoint” by the American Physical Society.