Wednesday , January 27 2021

So what is a hurricane of dark substance?



The sun in the city of stars.
Graphics: C. O & # 39; Hare / NASA

It is a perfect science fiction device: a dark matter hurricane. According to recent real studies, our sun is now surrounded by so-called stars. Some publications have devoted themselves to this ominous thought that the Earth is falling into a storm by dark matter. But if it does exist, we are already in a storm. The reality of the situation is not that serious, but it is nonetheless interesting.

The flow of stars is the per capita population. Once it may have been a piece of dwarf galaxy or globular cluster, it is now broken down by gravity and passed through some of our galaxy. Astronomers must be sure that the flow of stars should include some of the dark matter, because the material called dark matter is sure to act as a gravitational counterpart to dwarf galaxies. Perhaps dark matter experiments can detect dark matter particles in a recently discovered flow that flows through the neighbors of our universe.

Ciaran O 'Hare, a postdoctoral fellow at the Department of Theoretical Physics at the University of Zaragoza, said in an interview with Gizmodo, "Now we must have a flow of which we belong." "Immediately I was reminded of the consequences of dark matter."

The most successful models to describe the universe are: Experiments show that cosmos consists of 4% of normal matter, and 70% of the "dark energy" and the remaining 25% of "dark matter" . Everything we can see is made up of particles and a scaffold for a large-scale structure of the universe. However, this dark matter has only been observed by its gravitational effect.

Scientists are hunting for dark matter particles. However, surveys such as the European Space Agency's Gaia Telescope and the Sloan Digital Sky Survey have created a huge map of the sky with locations, speeds and other data points for our galaxy's territory. This data revealed a "substantial structure" like this flow, such as a dark matter hurricane like S1, which collided with the solar system frontal lobe.

Perhaps this dark matter hurricane can be detected by present dark matter detection experiments and will have a signal that is distinct from the background dark matter of the Milky Way. According to a paper published last week in Physical Review D, this technique will move at a much faster rate than the "background" dark matter. "The researchers analyzed whether or not they would be able to find rivers with an upcoming darkness.

When dark matter is composed of "weakly interacting macromolecules" or WIMPs, particles with similar masses to other particles According to the paper, a hurricane can only be detected when a particle has a specific mass range (imagine a light wind interacting with a skyscraper). Experiments such as the XENON NT detector in Italy "We chose the direction of the potential dark matter particles," explains Laura Baudis, a professor of physics at the University of Zurich, who was not involved in the new paper. This requires a much larger detector when considering the types of WIMPs that are already excluded.

And if the dark matter consists of much lighter particles instead called axons, the effect of the hurricane will probably be more pronounced by the paper's calculations.

Sownak Bose, a postdoctoral fellow at the Harvard-Smithsonian Center for Astrophysics, said in an interview with Gizmodo: "I think this is an interesting idea." All of these experiments to detect dark matter have shown that the extra flux There is. "

Bose pointed out that the amount of dark matter in the stream could vary depending on the particular dwarf galaxy that created the stream, or pointed out that dark matter is more exotic than the theoretical WIMP and accent. But he was excited about what a huge amount of Gaia data could do to study this flow.

So, if there is a dark matter hurricane, we are literally inside it now. But we are safe (at least in dark matter). This so-called storm is most interesting to the scientific outlook. O Hare said, "We know little about dark matter, and a better knowledge of its structure helps us understand it."

[PRD]

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