In the following article sources claim that a new EM engine works in a vacuum even though it “violates the Law of Conservation of Momentum”.
Evaluating NASA’s Futuristic EM Drive
In my novels, Pomroy’s World: Arrival and Pomroy’s World: Alone, one of the main characters, Juan Garcia, develops a device to directly detect dark matter.
Perhaps the vacuum is not empty.
Perhaps the thrust NASA’s EM drive develops is a result of forces from the virtual particles of the Quantum vacuum interacting with dark matter and dark energy.
Perhaps Juan Garcia found something important.
Perhaps the secret of dark matter and energy lies in Pomroy’s World.