The article leaves out all the numbers and so skips over one little problem. The momentum some people think they might have observed (if it's not experimental error) is compatible with what you'd get by using a microwave antenna as a thruster. Just ordinary radiation pressure, with the puzzle of how the radiation could be escaping the cavity.
But the minimal measurement results I've seen are not compatible with the radiation pressure multiplied by some large factor for the Q of the cavity, which seems to be the claim from some. That really would violate our understanding of conservation of momentum, rather than violating our assumptions about where the momentum goes in this experiment. And that seems to be ruled out experimentally so far.
But the minimal measurement results I've seen are not compatible with the radiation pressure multiplied by some large factor for the Q of the cavity, which seems to be the claim from some. That really would violate our understanding of conservation of momentum, rather than violating our assumptions about where the momentum goes in this experiment. And that seems to be ruled out experimentally so far.