Three months late, but uh.. Science lover and sci-fi/fantasy writer here...

Correct me if I'm wrong, but from what I understand this "negative mass dark fluid" would accelerate towards us if we exert a force on it as opposed to away, according to what I've read? What happens to ordinary matter then? Normally, two masses colliding push away, equal and opposite reaction. Being a negative mass, should I conceptualize this as something akin to a vacuum or "down-hill slope" which would instead 'pull' the positive mass in? Or is it the only thing that benefits from the reversal of the Third Law?

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Asking because after reading this, I'm conceptualizing it as a 'coating' placed on star ships to assist in acceleration at sub-light speed. Because, hey, who cares if it gets proved to not actually exist in our universe? If Mass Effect can come up with "element zero", I can certainly use this Dark Fluid thesis.