Assuming the existence of the higgs field, what would happen to an inertial object if it were to 'magically' reduce it's mass, through reducing it's ability to interact with the higgs field? Would it's velocity relative to a stationary object increase, decrease, or remain unaffected? Are there any other effects that I may not be considering? I am asking because I am writing a story in which I want the main characters to be accidentally transported forwards in time about 1000 years, and I came up with a possible mechanism: I imagined a 'higgs suppression' field which could be generated by a device on board a space craft, allowing rather meager means of propulsion to become much more effective. In my story, I have the first test of this device encountering a problem which causes it to overload and reduce the mass of the ship to a few planck masses, causing them to accelerate to within 99.9% of the speed of light. My question is because I am curious if this would really happen, assuming there was no additional thrust being added to the ship, or if I would need it to happen during an engine burn in order for them to reach that speed. I am assuming that the 'higgs suppression' field affects only the matter of the ship and it's contents, and not the reacting mass of the fuel as it is exploded behind the ship. (otherwise it'd be a pretty pointless thing to test it on a ship in space, instead of doing so in a gravitational field, where the measuring of it's mass is quite a bit easier.) Thanks in advance for the help. I hope this was the right forum for such a speculative question.