This has the feeling of a legitimate field of research. That's just my feeling.
I think that future versions of today's accelerators will "build" whatever
particles or matter that the math of physics says could exist, whether they
exist in nature (as measurable) or not.
As I understand it gravity is a warping of space-time. Maybe the first
practical use of this technology would be artificial gravity, since it would
presumably take much less "exotic" matter to try and accelerate a person
through a floor with an equivalent force of 9.8 newtons per gram than
to take a multi-kiloton ship to a star.
I read often in forums how this concept or that is unrealistic in practice
because of this issue or that. I find it somewhat surprising that people
interested in such things as future space travel, and the assumed open-
mindedness of such, could lead to such nay saying of exotic ideas (and
some not so exotic ideas) as I often read.
It seems that every generation has the idea that it bascally understands
what is possible and what is not, and they all turn out to be wrong.