For science: Did you know that there are theroies (very reasonable ones) that would allow us to slow down time? Or vice verse, to speed it up?
Imagine going to work just lasts a second and being at home lasts for years.
There are some more theories that claim to eb able to go back in time but that would lock you forever in another dimension (Like this scene from Interstellar, just that you couldn't do anything) until you reach the time where you would go back, in the end you wouldn't notice anything but you could teleport, using the time dimension.
Another theory claims tha twe can actually go back in time and duplicate ourselves. Bad thing: we wouldn't notice. Upon swapping dimensions, your other "me" would go into the first dimension so you will never ever see yourself.
Now what could be the most effective engine? It surely converts alot of energy, right? And what is the least useable form of energy? Yes, heat. So the most effective engine would create a tremendous amount of heat, right?
The simulated version doesn't. It cools down fuel to around -230°C and so is able to quickly switch between the states of the elemts: liquid, gas or solid. It acutally doesn't create a huge thrust, but it is able to store 50 times more fuel than in a liquid form.
The stored variant would be some kind of mixture between gas and solid, you basically compress the particles soooo dense that it takes up less space than usual.
bad sideeffect: it increases the weight.
Just some theories and stuff I found across the world from scientists, teachers, internet, books and the like.
0% guarantee that it is correct what I have written :D