Dark matter and dark energy may really be one "dark fluid" with negative mass

[Judi Lynn]

2. A Strange 'Dark Fluid' Could Explain The Missing 95 Percent of The Universe

MIKE MCRAE 6 DEC 2018

Galaxies spin faster than they should. Space is spreading apart when it shouldn't. And it's all starting to feel like we're forever going to be in the dark when it comes to the big questions in physics.

One physicist's solution lies in a hypothetical 'fluid' with negative mass. No, such a material has never been seen before. But the hunt for exotic particles and energies is getting harder by the day, so it's worth keeping our options open.

Jamie Farnes from the University of Oxford suggests we go back to Einstein's theory of general relativity – the one that describes gravity in terms of space-time geometry – and tweak it a little so it permits matter with negative mass to pop into existence.

This emergence of a strange 'pushing' particle could solve two of physics' most frustrating mysteries – why do galaxies hold together as they spin? And why does the Universe seem to be growing so quickly today compared with the past?

More:
https://www.sciencealert.com/a-strange-dark-fluid-could-explain-the-missing-95-percent-of-the-universe