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Dark Matter Enigma --"Remarkably Similar to Particles Known Since the 1930s"





"We have seen this kind of particle before. It has the same properties - same type of mass, the same type of interactions, in the same type of theory of strong interactions that gave forth the ordinary pions. It is incredibly exciting that we may finally understand why we came to exist," says Hitoshi Murayama, Professor of Physics at the University of California, Berkeley, and Director of the Kavli Institute for the Physics and Mathematics of the Universe at the University of Tokyo.

We owe a lot to dark matter - it is the thing keeping galaxies, stars, our solar system, and our bodies intact. Yet no one has been able to observe it, and it has often been regarded as a totally new exotic form of matter, such as a particle moving in extra dimensions of space or its quantum version, super-symmetry.

Now an international group of researchers has proposed a theory that dark matter is very similar to pions, which are responsible for binding atomic nuclei together. Their findings appear in the latest Physical Review Letters, published on July 10.




The image above is an artist's impression of dark matter distribution. Left image assumes conventional dark matter theories, where dark matter would be highly peaked in small area in galaxy center. Right image assumes SIMPs, where dark matter in galaxy would spread out from the center.

The new theory predicts dark matter is likely to interact with itself within galaxies or clusters of galaxies, possibly modifying the predicted mass distributions. "It can resolve outstanding discrepancies between data and computer simulations," says Eric Kuflik, a postdoctoral researcher at Cornell University. University of California, Berkeley postdoctoral researcher Yonit Hochberg adds, "The key differences in these properties between this new class of dark matter theories and previous ideas have profound implications on how dark matter can be discovered in upcoming experimental searches."

The next step will be to put this theory to the test using experiments such as the Large Hadron Collider and the new SuperKEK-B, and a proposed experiment SHiP.

Image credits: Kavli IPMU - Kavli IPMU modified this figure based on the image credited by NASA, STScI


The mass which fills 'empty' space is beginning to be referred to as the 'dark mass' in order to distinguish it from the baggage associated with dark matter.

'Dark Energy/Dark Mass: The Slient Truth'

"That is, all that we are certain about [is] the dark mass, not dark matter, let alone to say about the dark 'particle'."

What physics mistakes for the density of the dark matter is actually the state of displacement of the dark mass.

Particles of matter move through and displace the dark mass, including 'particles' as large as galaxies and galaxy clusters.

The Milky Way moves through and displaces the dark mass.

The Milky Way's halo is the state of displacement of the dark mass.

The Milky Way moves through and curves spacetime.

The Milky Way's halo is curved spacetime.

The state of displacement of the dark mass *is* curved spacetime.

We assume that dark matter is a substance the effect of which holds galaxies to not does dissolved.
We assume that dark matter exists.
We assume that the pions particles connect nuclei.
We assume that pions exist.
We assume that dark matter consists of particles that resemble the pions
We assume that dark matter interacts by itself.
We assume that all above is incredibly exciting, that we may finally understand why we came to exist.
Assumptions, assumptions, assumptions. But the result is zero.

Congratulation! An interesting idea, it seems possible and believable, I hope to be an incentive for experiments, of which will be taught anything more. We have so much knowledge and so advanced technology, as it is time to go further. Once again, goo luck.

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