International Research Group, including Dr. Surhuda Mora and Dr. Anupreta IUCAA), Pune eliminates the possibility of primary black holes, which are the main component of dark matter. This conclusion refutes the theoretical statements of Professor Stephen Hawking.
In the solar system, Mercury, the planet closest to the Sun, takes only 88 days to make one revolution around the Sun, and Neptune ̵
The material is considered to be "matter" because it is apparently gravitational and is "dark" because it does not interact with light (or whatever part of the electromagnetic spectrum matters). A detailed space survey shows that almost 85% of the total mass of the universe consists of dark matter. Thus, the stars, galaxies and atoms that we see around are just the tip of the iceberg, while the elusive dark matter is the bulk of the universe.
Primary black holes
Cosmologists have invented various hypotheses and theories to explain the dark matter. Some postulate that they consist of neutrinos, which are particles that have no charge, but have a tiny mass and, therefore, do not interact with the electromagnetic spectrum, but they interact gravitationally. Some others postulated that this might be some kind of new elemental particles – "Weakly interacting massive particles (WIMP)", or "gravitational-interacting massive particles" (GIMP), which have not yet been discovered.
An explosion hypothesis was proposed, two Soviet physicists, Yakov Borisovich Zeldovich and Igor Dmitrievich Novikov, showed that at the initial moment of a large explosion, the density would be very high at many points, which led to the formation of small black holes. They were called "primary black holes". Steven Hawking studied them in 1971. He calculated that the mass of primary black holes can range from one hundredth of a milligram to a height exceeding the mass of thousands of suns.
Black openings do not emit and will not be visible through any telescope. However, as initially proposed by Albert Einstein, if by chance, a tiny primary black hole eclipses a distant star, the light rays of the star will bend around the black hole through the gravitational effect, which makes the star look brighter than it originally was for a short time. This rare phenomenon, called "gravitational lensing", can occur only when the star, black hole and observer on the Earth are aligned in a straight line.
A research group headed by Masahiro Takada, Hiroko Nikiura and Naoki Yasuda from The Kavli Institute of Physics and the Math of the Universe used the Hyper Suprime-Cam on a Japanese Subaru telescope located in Hawaii for I'm looking for any evidence of the ghostly black holes between the Earth's galaxy and Andromeda using the technique of gravity lensing
It would be absurd to search for a needle in a haystack if we continue to look for one star and hope that for some time or the invisible primary black the hole will overshadow it. So, the research team watched the entire disk of the Andromeda galaxy, consisting of star-shaped stars. Now there is a chance for some primary black holes, if they exist in sufficient quantity, the eclipse of any of these stars becomes significant.
"The investigation is delicate and complicated. Eclipsed stars may get worse for a few minutes or a few hours through gravity lensing, which requires the team to take multiple images to catch flick, if any, "says Dr. Anupreta Mori, a member of the team.
] Throughout the night, the research team took 190 consecutive images of the Andromeda galaxy. If the Universe is filled with invisible small primary black holes, with masses lighter than a month, as claimed by Stephen Hawking, then we had to see at least 1000 events of a gravitational lens. We have seen no more than one candidate event, if not. This means that the theory of Professor Stephen Hawking that such black holes are all dark matter is wrong, says Dr. Anupreta.
"Previous studies have already ruled out the existence of a large number of primary black holes, which could vary in size from the mass of the moon to about 10 solar masses. This study excludes the presence of primary black holes with masses comparable to the Moon and about 0.1 millimeters in size. This means that in the best case, a lunar mass of primary black holes can contribute 0.1% of the total mass of dark matter, "says Dr. Surud Mori, another member of the research team.
A report on the work was published in Nature Astronomy. The team consisted of Hiroko Nikiru, Masahiro Takada, Naoki Yasudy from Kavli IPMU, Robert H. Lupton (Princeton University), Takakiro Sumi (Osaka University), Suruda Mohr (IUCAA, Kavli IPMU), Kavli IPMU), Sunao Sugiyama (Kavli IPMU, U Tokyo), Anupreeta More (IUCAA, Kavli IPMU), Masamune Oguri (U Tokyo, Kavli IPMU), Masashi Chiba (Tohoku University). (Indian Scientific Wire)