I’m creating a hard sci-fi setting for my novella, which takes place about 500 years in the future.
As I want the setting to be as realistic as possible, I want to avoid the sci-fi trope of having dark energy or dark matter being the generic “superweapon” etc.
If dark energy and/or matter could be harnessed, what could they be used for? (weapon? material? energy source? FTL travel?) Some assumptions can be made, as the sciences and technology have advanced 5 centuries.