Debate Magazine

Dark Fluid: This Bit Doesn't Make Sense

Posted on the 07 December 2018 by Markwadsworth @Mark_Wadsworth

From Space Daily:
The preamble:
Our best theoretical model can only explain 5% of the universe. The remaining 95% is famously [what sort of justification is that?] made up almost entirely of invisible, unknown material dubbed dark energy and dark matter. So even though there are a billion trillion stars in the observable universe, they are actually extremely rare.
The two mysterious dark substances can only be inferred from gravitational effects. Dark matter may be an invisible material, but it exerts a gravitational force on surrounding matter that we can measure. Dark energy is a repulsive force that makes the universe expand at an accelerating rate.
The two have always been treated as separate phenomena. But my new study, published in Astronomy and Astrophysics, suggests they may both be part of the same strange concept - a single, unified "dark fluid" of negative masses.

Jolly good, now here's the logic...
Negative masses are a hypothetical form of matter that would have a type of negative gravity - repelling all other material around them. Unlike familiar positive mass matter, if a negative mass was pushed, it would accelerate towards you rather than away from you...
My model shows that the surrounding repulsive force from dark fluid can also hold a galaxy together. The gravity from the positive mass galaxy attracts negative masses from all directions, and as the negative mass fluid comes nearer to the galaxy it in turn exerts a stronger repulsive force onto the galaxy that allows it to spin at higher speeds without flying apart.

That's a poor explanation. How can positive mass attract negative mass, but negative mass repel positive mass? Either the two repel each other (being mirror images)... or the two effects would cancel each other out.
Greater minds than mine reckon that there's no such thing as gravity anyway: space-time is bent by mass and objects travel 'downwards' to where time is passing more slowly (where there is more mass slowing time down). Just like a log which is floating down a river will come to rest in a static pool on the bank of the river if given half the chance.
So negative mass would just have the same effect on matter with negative mass. The logical conclusion would be that matter with positive mass would perceive time as passing more quickly if it were near negative mass, leading to the repulsive effect.
And what if you manage to force negative and positive mass matter together and mix it together, does it then have zero mass?

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