His basic idea was that at very low accelerations, corresponding to large distances, the second law broke down. (science.howstuffworks.com)
It may well be that standard physics breaks down in the limit of very high accelerations, but this is not implied by, and if true, will most probably not be related to, the breakdown at low accelerations. (discovermagazine.com)
The combination of ultra high vacuum and low acceleration voltage of this device were key components for the success of the study. (sciencedaily.com)