If you have an absolutely absurd amount of negative mass, you could create an Alcubierre warp drive that won’t immediately tear your ship apart. Unfortunately there’s no evidence that negative mass exists, and afaik current designs use amounts that are impossible to actually use (eg. the weight of a galaxy).
Tl;dr: Yes, but they may not be possible and may still be impractical if they were possible
There are?
If you have an absolutely absurd amount of negative mass, you could create an Alcubierre warp drive that won’t immediately tear your ship apart. Unfortunately there’s no evidence that negative mass exists, and afaik current designs use amounts that are impossible to actually use (eg. the weight of a galaxy).
Tl;dr: Yes, but they may not be possible and may still be impractical if they were possible