threesongs

4 ms·

1. 1.▲
   by threesongs 5y ago

   Violation of causality is equivalent to travelling back in time. Lots of problems there, and no good model for such things.
2. 2.▲
   by threesongs 5y ago

   It is an important paper. However, it is also important to realise that superluminal solutions introduced there are still prohibited by the laws of physics. Making such superluminal drives is at least as hard as making superluminal matter,
3. 3.▲
   by threesongs 5y ago

   IMO the paper clarifies the misconceptions about all warp drives. They all need propulsion, for example, to be consistent with physics.
4. 4.▲
   by threesongs 5y ago

   A conclusion of the paper is that any warp drive, including all the ones proposed in the literature, fits in the categories explained in the paper.
5. 5.▲
   by threesongs 5y ago

   The version accepted in the journal clearly states that superluminal warp drives are physically unachievable because they violate the dominant energy condition. It means that superluminal drives require superluminal matter. This is in agree