'Dark fluid' with negative mass could dominate the universe

Re:'Dark fluid' with negative mass could dominate the universe by dragonwriter on Wednesday December 05, 2018 @05:04PM (#18613114)

> If you stand on the balloon it doesn't make sense to ask "where is the balloon expanding from?".

Sure it does, and there is a well-defined answer, it's just the answer does not lie on the surface of the balloon. (And for a perfectly spherical balloon, is equidistant from every point on the surface.)

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Re:'Dark fluid' with negative mass could dominate the universe by danbruc on Wednesday December 05, 2018 @06:28PM (#18613826)

That of course only works because the surfaces of balloons we are used to are always embedded in spacetime. There is however no [good][known] reason to assume that spacetime itself is embedded in any space.

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Re:'Dark fluid' with negative mass could dominate the universe by OscarCunningham on Wednesday December 05, 2018 @10:58PM (#18615273)

I've always thought this would be an interesting experiment. Assume that spacetime does live in a higher dimensional space, and try to arrange masses so that spacetime is forced to intersect itself. See if anything interesting happens.

Of course this probably requires some stellar engineering.

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