Some dark matter consists of primitive black holes? Not excluding this possibility

 Some dark matter consists of primitive black holes? Not excluding this possibility

Beijing, Sept. 23, Science and Technology Daily (Reporter Zhang Menglan) An international team, including scientists from the European Nuclear Center (CERN), used supercomputers to focus on the original black hole that was born immediately after the Big Bang, reproducing the interaction between photons and hydrogen. After their analysis, they found that the cosmic web is a network of silk threads of gas and dark matter, with antennae covering every corner of the universe. The research paper, published in the latest Physical Review Letters, is expected to reveal the nature of dark matter.

The theory is that less than a second after the Big Bang, the universe may have produced a large number of primitive black holes. After the laser interferometric gravitational wave observatory (LIGO) observed gravitational waves directly in 2016, Euclidean Center scientist Alvessel Lacaneri said: Primitive black holes are still hypothetical objects.

However, in recent years, the study of primitive black holes has been put on the agenda, because they are considered as important candidates to explain the composition of dark matter, and primitive black holes, whether they exist or are completely excluded, will provide important information about primitive cosmic physics for human beings.

This time, scientists from the Italian Institute of International Advanced Studies (SISSA), the Italian National Institute of Nuclear Physics (ICTP) and the European Center for Nuclear Research (ECN) focused on the interaction between hydrogen and photons in the Lehman alpha forest, the cosmic silk line. With the help of Ulysses supercomputer, they analyzed the interaction between the radiation from extremely distant quasars and the cosmic network, and then compared the simulation results with those observed by the Keck Telescope. Thus, some characteristics and effects of the original black hole are locked.

Lead author Ricardo Murgia said they tested the hypothesis that dark matter consists of non-stellar collapsed black holes formed in the primitive universe.

Simply put, they used computers to simulate the distribution of neutral hydrogen in subgalaxies. By further comparison, the mass and abundance limits of the original black holes are determined, and then whether they constitute dark matter is determined.

At this stage, the results do not support that all dark matter consists of a particular type of primitive black hole (50 times the mass of the sun), but they do not completely rule out the possibility that primitive black holes make up a small amount of dark matter.

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Many ideas about dark matter sound strange and crazy. Hawking, for example, once suggested that dark matter might be a primitive black hole with a very small diameter. Primitive black holes are the product of the early expansion of the universe and are more pocket-sized than black holes formed by the collapse of stars. Over the years, many studies have tried to find the relationship between primitive black holes and dark matter, but the conclusions are negative. Dark matter, which accounts for 85% of the total mass of matter in the universe, has yet to show itself to humans. People only know its there. But what it is, how it works with other particles, and what role it plays in standard physics models are all mysteries.

Source of this article: responsible editor of Science and Technology Daily: Wang Fengzhi_NT2541