قالب وردپرس درنا توس
Home / Science / Is all the dark matter in the universe made of primitive black holes? | Astronomy, Physics

Is all the dark matter in the universe made of primitive black holes? | Astronomy, Physics



In a new paper in the journal Medical letter, A group of international theoretical physicists described a primordial black hole formed by vacuum bubbles in the early universe, and discussed its interesting understanding that can naturally explain all dark matter.

Soon after the Big Bang, the

Soon after the Big Bang, the “baby universe”

; branched out of our universe and became a black hole for us. Image courtesy: Kavli Institute of Cosmophysics and Mathematics.

Primitive black holes are imaginary compact objects that formed in the early universe, before any galaxies and stars.

They are viable dark matter candidates, and astrophysicists believe that this missing matter accounts for 85% of the universe.

These compact objects, first proposed decades ago, can play a central role in various astrophysics phenomena, such as the ancestors of gravitational waves and the seeds of supermassive black holes.

When they collide with neutron stars and destroy them, releasing neutron-rich material, they may also play a role in the synthesis of heavy elements.

In the new paper, Dr. Alexander Kusenko from the Kavli Institute of Cosmophysics and Mathematics and the University of California, Los Angeles, and his colleagues from Japan, the United States and Taiwan describe the formation of the “multi-universe” situation of primitive black holes.

They explained: “The early universe was so dense that any positive density fluctuations of more than 50% would produce black holes.”

“However, the cosmic disturbances that are seeded by known galaxies are much smaller. Nevertheless, many processes in the early universe may have created the right conditions for the formation of black holes.”

“An exciting possibility is that the primordial black hole may be formed by the’baby universe’ formed during inflation, a period of rapid expansion, and it is believed that this is the structure we observe today (such as galaxies and Galaxy cluster) sowing.”

“During inflation, the baby universe can branch out of our universe. A small baby (or “daughter”) universe will eventually collapse, but the large amount of energy released in a small volume will form a black hole.”

“A more peculiar fate awaits a bigger baby world. If it is larger than a certain critical size, then Einstein’s theory of gravity will allow the baby universe to exist in a state that is different from internal and external observers.”

“Internal observers see it as an expanding universe, while external observers see it as a black hole.”

“In either case, we regard baby universes large and small as primitive black holes, which hide the underlying structure of multiple universes behind their event line of sight.”

Dr. Kusenko and his co-authors also showed that the Hyper Suprime-Cam (HSC) using the 8.2-meter Subaru Telescope can detect primitive black holes.

“We have proved through numerical studies that future observations of HSC and other optical surveys, such as the Vera C. Rubin Observatory, if they can serve as the main source of this primitive primitive black hole formation mechanism, will be able to provide definite tests, they said.

_____

Alexander Kusenko Wait. 2020. Use optical telescopes to explore primitive black holes in the multiverse. Physical Wright Pastor 125(18): 181304; doi: 10.1103 / PhysRevLett.125.181304


Source link