قالب وردپرس درنا توس
Home https://server7.kproxy.com/servlet/redirect.srv/sruj/smyrwpoii/p2/ Science https://server7.kproxy.com/servlet/redirect.srv/sruj/smyrwpoii/p2/ Astronomers simply excluded the Hawking theory of the primordial nature of dark matter

Astronomers simply excluded the Hawking theory of the primordial nature of dark matter



We still do not know what dark matter is, but we can break through the line through one option. This is not, according to the theory proposed by the brilliant Stephen Hawking, a bunch of small microscopic black holes.

In the harshest test of the theory to date, an international team led by researchers from the Institute of Physics and Mathematics of the Universe in Kavli (IPMU) in Japan was looking for signs of such meager black holes, and

Scientists hunted a certain flicker of stars in a nearby galaxy – yes , as the light seems to us, if before it passed a black hole less than a tenth of a millimeter.

A black hole of this size may seem inappropriate, but the concept actually emanates from the elegant Hawking theory, which tried to solve our massive problem of dark matter.

The problem is: on the basis of our observations, the gravitational forces playing in the universe, we know that 85% of the masses created by what we can not see and that we can not find out right

In the paper of 1

971, Hawking expanded The theory of primary black holes, which were proposed by scientists Yakov Borisovich Zeldovich and Novikov Igor Dmitrievich in 1966.

Immediately after the Big Bang, the theory goes when the Universe was about to be the area of ​​substance in the primary soup, which was denser than others – sufficiently dense for gravitational collapse. From the stars there were no openings, they could be much less mass – only 10 -8 kg.

Now even a black black hole has a mass. A black hole with a diameter of the horizon of events of 0.1 millimeters would have exceeded 67 thousand metric tons. So, if there were a bunch of these tiny black holes – and they did not evaporate due to Hawking's radiation – they could obviously explain the mass that we do not see.

A bunch of these black holes rotating around Hawking's enormous speeds, we can see how they bend the light of the objects they move in front of it, an effect called gravity lensing. on. Using the Hyper Suprime Cam on Subaru's telescope in Mauna Kea, Hawaii, researchers from Japan, India and the United States watched all neighboring Andromeda galaxies seizing 190 consecutive images for seven hours

.

If the primary black hole had to move between us and the star, it is expected that the star will shimmer and light up for several minutes to hours when the severity of the black hole has increased its light.

The team predicted that the abundance of black holes smaller than the moon needed to produce the effect of dark matter would lead to about 1,000 events

. dark matter (A study last year found that primary black holes can not make more than 40 percent dark matter.)

What, in essence, means that dark matter does not consist of small black holes.

to be the final nail in the coffin of theory – scientists love to be extremely thorough, after all. But for the time being, the primary black holes are not there, and we must look for a dark matter elsewhere.

The research was published in in the nature of astronomy .


Source link