'Dark fluid' with negative mass could dominate the universe

Re:'Dark fluid' with negative mass could dominate the universe by sp332 on Wednesday December 05, 2018 @12:04PM (#18610129)

Maybe it was modeled as a curvature of space? So positive masses curve space so that everything moves toward them - including light, massless particles, and negative mass. And negative mass repels everything, including other negative mass, by shaping space differently.

[Edit: jbay808 has a better explanation below, and negative mass attracts negative mass.]

That behavior is described here https://en.wikipedia.org/wiki/Negative_mass#Runaway_motion but it's not what I was expecting either.

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Re:'Dark fluid' with negative mass could dominate the universe by astrocat on Wednesday December 05, 2018 @07:53PM (#18614383)

Yeah this helped me create a mental picture that kind of makes sense. It would clarify why negative mass is also concentrated in areas of high mass, and could also provide the mechanism for constant universe expansion, as the space between masses is constantly being pushed away by the diffuse negative mass. Heh, armchair physics is fun :)

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Re:'Dark fluid' with negative mass could dominate the universe by smaddox on Wednesday December 05, 2018 @02:42PM (#18611724)

Huh, very interesting. Definitely not intuitive by comparison to electric charge.

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