An international research team, including Dr. med. Surhud More and Dr. Anupreeta More of the Interuniversity Center for Astronomy and Astrophysics (IUCAA), Pune has ruled out the possibility that pristine black holes are a major constituent of dark matter. This finding disproves a theoretical statement by Prof. Stephen Hawking.
In the solar system, Mercury, the planet closest to the sun, only takes 88 days to make one turn around the Sun, while Neptune is furthest away. One takes 1
The material is considered "matter" because it seems to have attraction and it is "dark" because it does not seem to interact with light (or for the light) any part of the electromagnetic spectrum). Detailed investigations of the cosmos show that nearly 85% of the total mass of the universe is dark matter. Stars, galaxies, and atoms we see everywhere are just the tip of the iceberg, and the elusive dark matter makes up most of the universe.
Primordial Black Holes
Cosmologists have put forward various hypotheses and opinions on theories of dark matter explanation. Some postulate that they consist of neutrinos, particles that have no charge but a tiny mass and therefore do not interact with the electromagnetic spectrum but gravitationally interact. Others have postulated that they could be a new kind of elementary particle – "weakly interacting massive particles (WIMPs)" or "gravitationally interacting massive particles" (GIMPs) that still need to be discovered.
When the big The Bang hypothesis was proposed, two Soviet physicists, Yakov Borisovich Zel Dovich and Igor Dmitriyevich Novikov, showed that the dens at the beginning of the Big Bang would have been very high in many places, leading to the formation of led small black holes. They were called "original black holes". Stephen Hawking examined it in 1971. He calculated that the mass of the original black holes could range from a hundredth of a milligram to more than the mass of a thousand suns.
Black holes do not radiate and are not visible through any telescope. As suggested by Albert Einstein for the first time, a tiny original black hole randomly bends to a distant star. The light rays of the star curve around the black hole due to the gravitational effect, causing the star to appear brighter than originally for a short time. Called "gravitational lenses," these rare phenomena can only occur when the star, the black hole, and the observer on Earth are in a straight line.
The research team led by Masahiro Takada, Hiroko Niikura, and Naoki Yasuda conducted by the Kavli Institute for the Physics and Mathematics of the Universe used the Hyper Suprime Cam of the Japanese Subaru Telescope in Hawaii to look for telltale evidence of original black holes between Earth and the Andromeda Galaxy using gravitational lensing technology
In Search of the Lightning [1 9459025] It would be absurd to look for a needle in a haystack as we continue to look at a star, hoping at some point that an invisible, original black hole will darken it. The research team was constantly watching the entire disk of the Andromeda galaxy, which consisted of starsakhs. Now there is a chance for some primitive black holes, if they are present in sufficient numbers, the dimming of one of these stars will be significant.
"The investigation is delicate and complicated. The covert star can lighten up for a few minutes or a few hours due to gravitational lenses, so the team has to take multiple pictures to capture the flicker, if any, "says Dr. Anupreeta More, a member of the team. [19659006WährendeinerganzenNachtmachtedasForschungsteam190aufeinanderfolgendeBilderderAndromedaGalaxy"WenndasUniversummitunsichtbarenkleinenwinzigenursprünglichenschwarzenLöcherngefülltistderenMassenleichtersindalsderMondwievonStephenHawkingpostulierthättenwirmindestens1000GravitationslinsenereignissegesehenWirhabenhöchstenseinsolchesKandidatenereignisgesehenwennnichtgarkeinDiesimpliziertdieBehauptungvonProfessorStephenHawkingdasssolcheschwarzenLöcherdiegesamtedunkleMaterieausmachenistfalsch"sagtDrAnupreeta
"Previous studies had already ruled out the presence of a large number of original black holes could vary the size of the mass of the moon at about 10 solar masses. The present study excludes the presence of original black holes with moon-like masses and sizes of about 0.1 millimeter. This implies that the primary black holes of the lunar mass can at best contribute 0.1 percent of the total mass of dark matter, "says Dr. Surhud More, another member of the research team.
A report on the work was published in Nature Astronomy The team consisted of Hiroko Niikura, Masahiro Takada, Naoki Yasuda of Kavli IPMU, Robert H. Lupton of Princeton University, Takahiro Sumi of Osaka University, Surhud More of IUCAA, Kavli IPMU, Toshiki Kurita of Kavli IPMU, U of Tokyo), Sunao Sugiyama (Kavli IPMU, United States of Tokyo), Anupreeta More (IUCAA, Kavli IPMU), Masamune Oguri (United States of Tokyo, Kavli IPMU), Masashi Chiba (Tohoku University). (India Science Wire)