Tuesday , May 18 2021

So what's going on with that "dark hide"?



It's a perfect science-fiction device: a hurricane of dark matter. Recent real-life research has shown that our Sun is currently preoccupied with the so-called stellar currents.

Some publications have stumbled upon this ominous sound idea, saying that the Earth will be looted by a storm of black matter – but in fact, if it exists, we are already in a storm. The reality of the situation is not quite so serious, but it is still interesting.

Star streams are populations of related stars that used to be pieces of a dwarf galaxy or globular clusters, but they were now separated by gravitational forces and passing through parts of our galaxy.

Since astronomers are pretty sure that things called dark matter serve as a gravitational scaffold for dwarf galaxies, it is assumed that the star stream should also contain a certain percentage of dark matter. Perhaps an experiment in dark matter can detect particles of dark matter from the recently discovered stream that passes through our cosmic neighborhood.

"There should be a stream in which we are now," said Ciaran O'Hare, a postdoctoral researcher at the Department of Theoretical Physics at the University of Zaragoza. Gizmodo. "It prompted me to think about the consequences for the dark matter."

The most successful models for the description of the universe are based on experiments that show that the cosmos is composed of 4% of regular matter, perhaps 70% of "dark energy" that reduces the universe, and the rest about 25%, "Dark matter". Scientists have reason to believe that dark matter consists of particles, in the same way that everything we see is made of particles, and that it is sculpted for the structure of the great universe. But this dark matter is only ever observed on the basis of its gravitational effects.

Scientists are in the middle of hunting a particle of dark matter. In the meantime, surveys like the Gaia telescope of the European Space Agency and Sloan Digital Ski Surveys have created huge maps of the sky, along with the positions, speed, and other data points for our Milky Way galaxy. The data revealed "significant structures", such as this flow and accompanying hurricane dark matter, called S1, striking the Solar System.

Perhaps this snakebite could be detected using today's existing dark matter detection experiments and would distinguish the signal from the dark matter of the Milky Way. It would be much faster – "hurricane", compared to dark matter "the wind", according to the papers published last week Physical examination D. The researchers then analyzed whether they would be able to spot the flow of upcoming dark matter detectors.

If the dark matter is made up of a "weakly-acting solid particle" or a VIMP, particles of mass similar to other particles, but which poor interaction (imagine a light breeze interacting with a skyscraper), then hurricane would only be recognized if the particles were specific mass range, according to the article.

Experiments like KSENON NT detectors in Italy could not choose the direction of the potential dark matter particles, explains Laura Baudis, physics professor at the University of Zurich who was not involved in the new work. This would mean a much larger detector, considering the types of VIMPs that are already excluded.

And if, instead of dark matter, it consists of much lighter particles called axion, the effects of hurricane might be more tempting, according to calculations of paper.

"I think it's a very interesting idea," said Sovnak Bose, a postdoctor at the Harvard-Smithsonian Center for Astrophysics Gizmodo. "All these experiments are trying to detect dark matter, and they have the ability to boost their signals with this additional flux."

Bose pointed out that the amount of dark matter in progress can vary depending on the specific dwarf galaxy that created the current – or if the dark matter is something more exotic than the theoretical VIMPs and axions. But he was excited about the incredible amount of Gaia data he could do to study these currents.

So if the hurricane is dark matter, it is literally inside. But we are safe (from dark matter, at least). This so-called. The storm is most exciting for its scientific perspectives. O'Hare said: "We know so much about dark matter that any kind of better knowledge of its structure will contribute to helping us understand it."

[PRD]

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