Is this actually a new finding? I can think of a few reasons why the actual speed of light is already known to fluctuate – vacuum is not absolute vacuum, and the uncertainty principle guarantees that the speed of light, or rather, individual photons, is non-constant. Also, it is already known that particles do tend to pop in and out of existence all the time. What in this study is inconsistent with what we know? Does the speed of light fluctuate more than predicted by other studies?