What could possibly power an Alcubierre drive?

I understand that in order to compress and expand spacetime, an Alcubierre drive would require some sort of "exotic matter" with a negative energy density.

Is that sort of exotic matter purely hypothetical? If not, what would it look like? How would it behave? Is it related in any way to antimatter?

Lastly, would that the exotic matter either fill or form the rings that surround the ship? (as seen in various conceptual designs from NASA) And am I right in assuming that it would be wrong to treat the exotic matter as some sort of fuel that's depleted, rather than as an integral part of the ship itself?

Thanks in advance for any pointers. This is my first question, so I apologize if it's too broad or if it overlaps with any others I may have overlooked.

posted about 5 years ago

HolocronCollector‭

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