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I agree with you that big_BHOY's use of the term "exotic matter" may not be appropriate in this case, but aside from that questionable terminology, I think I know what he's talking about. I've heard it called "negative mass", but NASA's researcher calls it "negative energy density".
Originally posted by Astyanax
reply to post by big_BHOY
In the case of the warp-drive, exotic matter which currently doesn't exist, has to be created somehow in a lab.
All you need is energy. Antimatter will do fine. Antimatter exists.
The hypothesized "dark energy" presumably has negative energy density, but it's pretty weak and my take is we'd need something along those lines but stronger to engineer an Alcubierre drive, and we don't really even have a handle on dark energy yet, so we are a long way from engineering a similar but stronger form of negative energy density, if such a thing is even possible.
While it would appear that the model has nearly all the desirable mathematical characteristics of a true interstellar space drive, the metric has one less appealing characteristic – it violates all three energy conditions (strong, weak, and dominant) because of the need for negative energy density. This does not necessarily preclude the idea as the cosmos is continually experiencing inflation as evidenced by observation, but the salient question is can the idea be engineered to a point that it proves useful for exploration.
Gamma and X-rays are not charged particles, they are forms of electromagnetic radiation.
Originally posted by Arbitrageur
You may want to read this NASA article and slideshow. The need for a negative energy density does seem to be an issue, perhaps a bigger issue than the need for lots of energy.
Originally posted by UKLionheart
reply to post by andy06shake
Surely they already have something like this which they used to go to the moon? Unless... They didn't really go?