phys.org/news/2018-12-universe-theory-percent-cosmos.html?

Scientists at the University of Oxford may have solved one of the biggest questions in modern physics, with a new paper unifying dark matter and dark energy into a single phenomenon: a fluid which possesses ‘negative mass.” If you were to push a negative mass, it would accelerate towards you. This astonishing new theory may also prove right a prediction that Einstein made 100 years ago.

Bogsnorkler said:

phys.org/news/2018-12-universe-theory-percent-cosmos.html?

Scientists at the University of Oxford may have solved one of the biggest questions in modern physics, with a new paper unifying dark matter and dark energy into a single phenomenon: a fluid which possesses ‘negative mass.” If you were to push a negative mass, it would accelerate towards you. This astonishing new theory may also prove right a prediction that Einstein made 100 years ago.

Fair enough, but arguably they haven’t added any knowledge, just described the evidence in different terms.

Bogsnorkler said:

phys.org/news/2018-12-universe-theory-percent-cosmos.html?

Scientists at the University of Oxford may have solved one of the biggest questions in modern physics, with a new paper unifying dark matter and dark energy into a single phenomenon: a fluid which possesses ‘negative mass.” If you were to push a negative mass, it would accelerate towards you. This astonishing new theory may also prove right a prediction that Einstein made 100 years ago.

How interesting. This seems cute enough to be possible.

Bogsnorkler said:

phys.org/news/2018-12-universe-theory-percent-cosmos.html?

Scientists at the University of Oxford may have solved one of the biggest questions in modern physics, with a new paper unifying dark matter and dark energy into a single phenomenon: a fluid which possesses ‘negative mass.” If you were to push a negative mass, it would accelerate towards you. This astonishing new theory may also prove right a prediction that Einstein made 100 years ago.

“However, Dr. Farnes’ research applies a creation tensor, which allows for negative masses to be continuously created.”

Ressurrecting Fred Hoyle. I don’t see immediately how it could have anything to do with dark matter. Have to read paper.

The idea of a gravitational repulsion between galaxies has been thought of by thousands of people, myself included, and quickly rejected.

https://arxiv.org/pdf/1712.07962

“These haloes are not cuspy.”

Good point.

“Positive and negative mass interaction”.

Perpetual motion machine. Not good.

Overall, it completely fails to explain how different galaxies can have different ratios of dark matter to visible matter.

Bogsnorkler said:

If you were to push a negative mass, it would accelerate towards you.

So if you have a positive mass and a negative mass of equal magnitude, which one wins?

Or do they stay the same distance apart?

mollwollfumble said:

“Positive and negative mass interaction”.

Perpetual motion machine. Not good.

as long as no work is being done…

Bogsnorkler said:

as long as no work is being done…

Look at me, ma, i’m a perpetual motion machine.

So is negative mass the same as exotic mass the proposed substance needed to keep the mouth of wormholes open

Negative mass would possess some strange properties, such as accelerating in the direction opposite of applied force. Despite being inconsistent with the expected behavior of “normal” matter, negative mass is mathematically consistent and introduces no violation of conservation of momentum or energy. It is used in certain speculative theories, such as on the construction of artificial wormholes and the Alcubierre drive. The closest known real representative of such exotic matter is the region of pseudo-negative-pressure density produced by the Casimir effect.

The Rev Dodgson said:

Bogsnorkler said:

If you were to push a negative mass, it would accelerate towards you.

So if you have a positive mass and a negative mass of equal magnitude, which one wins?

Or do they stay the same distance apart?

For equal masses, the stay the same distance apart and accelerate towards infinity.

> So is negative mass the same as exotic mass the proposed substance needed to keep the mouth of wormholes open.

I’m not sure. The exotic (ie nonexistent) mass needed to keep wormholes open has the property that density and pressure are opposite. Increasing the pressure reduces the density and vice versa.

The newly proposed negative mass has the property that it is created out of empty space. So is in direct conflict with the conservation of mass/energy of relativity, both general and special.