Technology Physics: Can Dark Matter Cool? New Theory Says Yes

18:52  09 february  2018
18:52  09 february  2018 Source:   newsweek.com

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New Theory Says Yes . Friday, January 15, 2016 3:47. Dark matter is the dominant form of substance in the universe, which leads physicists to devise theories and experiments to explore its properties and understand how it originated.

Déjà-vu, new theory says dark matter acts like well-known particle. But as the universe continued to expand and cool , dark matter particles encountered New Theory Says " Yes ". August 12, 2013. One of the biggest mysteries in contemporary particle physics and cosmology is why dark energy

Artist's concept of matter around a black hole.: Dark matter refers to matter that we can't see, but the matter that we can see—the kind that the Earth is made from—is called baryonic matter © NASA Dark matter refers to matter that we can't see, but the matter that we can see—the kind that the Earth is made from—is called baryonic matter Dark matter is a mysterious form of matter that is not visible to us, and is thought to make up about 27 percent of matter in the universe, according to NASA. Astrophysicists have long thought that this theoretical matter cannot cool itself down by releasing some of its kinetic energy—and thereby heat—the way other forms of matter can.

That theory makes sense because if dark matter could cool itself, then loose, random dark matter particles could coalesce. A dense enough clump of these particles could begin building itself into a compact object—the same process by which other kinds of matter gradually build into galaxies, and the celestial bodies inside them such as stars and planets. The more scientists understand about dark matter, the more they can understand about galaxy and planet formation. 

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Baryonic matter can cool , and along these lines shape objects like the Earth, since it contains charged particles—the collaborations between which are an Dim issue isn’t thought to contain charges the way baryonic matter does; its particles would just be fit for powerless connections, Buckley said .

Dark matter is one of the biggest mysteries of physics , with the majority of experts agreeing that it likely exists, though they have no concrete proof. Physics : Can Dark Matter Cool ? New Theory Says Yes .

“We assume dark matter doesn’t cool, because if you take a beautiful spiral-disk galaxy like the Milky Way and look at what dark matter appears to be doing, it’s all in this big kind of fluffy halo, like a cloud,” Matthew Buckley, a physicist at Rutgers University, told Newsweek, referring to what are known as galactic halos. “If it had cooled, that halo would have collapsed.”

Buckley and a colleague from Rutgers University have created a new theoretical model in which dark matter is able to cool after all. According to their research, if most dark matter cooled, then it would still reside inside its galactic halos. Some of it, though, could be scattered in small pockets throughout the galaxy. A paper describing the research was published earlier this month in the scientific journal Physical Review Letters.

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New Theory Says Yes . Man's murder conviction quashed over jury's visit to rubbish chute in which victim died. Dennis Wise: Eden Hazard is a genuine world-class player. This is interesting! Are We Closer to Finding a Fifth Dimension? Physics : Can Dark Matter Cool ?

Verlinde says , "Many theoretical physicists like me are working on a revision of the theory , and some major advancements have been made. WIMPS is the most straightforward explanation for Dark Matter , other theory is just too hopeful of new physic .

Dark matter refers to matter that we can't see, but the matter that we can see—the kind that the Earth is made from—is called baryonic matter, and it's composed of familiar charged particles like protons and neutrons. It makes up about five percent of matter in the universe, according to NASA. Baryonic matter can cool, and thus form objects like the Earth, because it contains charged particles—the interactions between which are a prerequisite for creating larger structures.

Dark matter isn't thought to contain charges the way baryonic matter does; its particles would only be capable of weak interactions, Buckley said. Plus, if dark matter radiated away from its galactic halos—as it would if it cooled—it would leave those halos structurally weakened, and vulnerable to collapse.

This reasoning is why astrophysicists have believed that dark matter cannot cool. But without concrete evidence, it's possible that the reasoning is wrong. What if dark matter particles did have a something like a charge, and could be released without collapsing their halos, and we just hadn't yet seen any of it?

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Summary: Scientists have come up with a new theory on how dark matter may have been formed shortly after the origin of the universe. In the new dark matter model, the Higgs particle has different properties to those in the standard model of particle physics .

"We have evidence that this new view of gravity actually agrees with the observations," said Verlinde. "At large scales, it seems, gravity just doesn't behave the way Einstein's theory predicts." Tags: Dark Matter Gravity Physics .

In the new theoretical model from Buckley and his team, dark matter contained two distinct varieties of charged particles—you can think of them as the kind of mirror-image counterparts of protons and electrons. It showed that such particles could, in fact, radiate energy, and do so without collapsing their galactic halo, by accounting for crucial variation in the dark matter density from one halo to the next. Some halos contain so much dark matter that the particles can never release and cool; it really is just stuck there. But in halos under a certain size, some dark matter might be able to cool and begin forming compact objects after all.

“The biggest possible clump that we found could still cool efficiently is a Milky Way-size galaxy," Buckley said. "The Milky Way hasn’t collapsed of course, but there might be smaller clumps within it that did.”

What exactly those objects might look like, he doesn't know. Size-wise, they could be anything between supermassive stars all the way up to dwarf galaxies.

"With dark matter, there's a lot of debate and [different] theories," Buckley said. "My motivation for this idea is that I’d like to go and prove that it’s wrong.”

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