I need to understand the implications of negative mass further to accept this theory. The main problem is that negative mass matter would be able to exceed the speed of light based on Einstein’s special relativity equations and we have never observed any such phenomena. Violating the light constant velocity would also undermine the core concept of causality between fundamental particles and forces in the universe. Break out the hyperdrives and time machines. I’ll wait for the confirmation before I get too attached to this idea.
Negative mass is a nonsense concept. The implication of it is that we have abandoned all reason and logic whatsoever by taking it seriously, and are now saying whatever it takes to get the next grant.
There isn't much that's actually new here, and most of it has been speculated about in the context of General Relativity for a long time. The real question is whether vacuum exerts zero, positive (pressure) or negative (attraction).
That can be done in the Einstein Field Equations without the "negative mass" taking on the same significance as the ordinary, inertial mass which cannot exceed the speed of light.
“The main problem is that negative mass matter would be able to exceed the speed of light based on Einstein’s special relativity equations”
It doesn’t because the time vector is reversed as mentioned in an above comment. Like miles per (negative) second.
Zero mass particles such as photons and alleged "gravitons" travel precisely at the speed of light. But how do you figure that supposed "negative mass" particles would travel faster than light?