Black holes of different masses may have formed during the first second of the Big Bang and eventually became the source of dark matter. In a new scenario, these primitive black holes may have given birth to earlier stars than previously expected. The James Webb Space Telescope can confirm this theory.
echoes an article posted on an asa press releaseAnd who is the sea serpent of astrophysics and For about 50 years. With the many oscillations of the pendulum the question continues to be debated as to their relevance to solving thorny problems that are of nature. and the origin of , It is also hoped that they can be used to demonstrate the existence of Hawking radiation. of course they are Primitive.
Let us go back to the explanations given about them several times in Futura articles. These objects are also known as mini black holes and they are no less thanwho took care of it based on Through and Igor Novikov, two great leaders of Russian astrophysics and relativistic cosmology.
big bang fossil black hole
Everything in logic relating to these still theoretical objects is based on a very simple observation. In terms of the type of relativistic cosmological model, the “initial” density of It had to be too big to be seen. if we have to believe trying to describe and area of close to the early cosmological singularity Classically, the universe was then very turbulent with chaotic fluctuations of its metric and its density, as shown by the work of Charles Misner (known as the model). Mixmaster Universe), as well as Belinsky’s, and Lifchitz. Recently, in addition, work on produced at that time indicating that the word Can be used literally in its hydrodynamic sense.
Under these hellish conditions, if the density fluctuates such that a given mass passes under itfalling by itself , had to be the result of a black hole.
The problem is that we don’t know very well how many could have become or from whom.but a big possible, depending on the model and Used to describe this very primitive phase of the observable universe. Theoretically they can have a mass as low as (MP=10-5 g), but beyond that, for example 1,000 to 105 solar masses, which can therefore serve in the latter case for the training of ,
When the existence of dark matter began to be seriously considered, it was explained quite naturally by bringing in these primordial black holes, which are therefore called mini-black holes, when their mass and size are much smaller than they are.From , all the , or only a part, can be made.
Over the years, many observational constraints have been placed on the mass of primordial black holes, that is, on the abundance of these objects in a given mass interval.of the observable universe. In general, conclusions about the existence of these black holes were quite pessimistic and could account for a fraction of dark matter.
Speculation was revived with the discovery ofProduced by black hole in Unusually massive even if the masses involved are of the order of stars. to account for , The suggested that these black holes are in fact primordial black holes, and their rapid detection would mean that they are still numerous to the point of accounting for dark matter.
Nico Capeluti (University of Miami), Gunther Hasinger (ESA’s Scientific Director) and Priyamvada Natarajan (Yale University) have revived the pendulum with their article recently accepted for publication. The Astrophysical Journal,
The researchers therefore propose a new model that, according to them, adapts to the constraints that have already excluded many gaps for the already existing black hole population and they believe have Not only have you killed two birds with one stone. Origin of supermassive black holes but also dark matter. They allow the accelerated formation of the first stars and many observational signatures to be tested, or at least predicted to constrain their scenario.
Primordial black holes created by phase transitions
It takes on the idea recently put forward by other researchers, which involves the formation of primordial black holes in four successive stages. The first black hole of planetary massthanks for the mechanism , then a black hole of the order of Chandrasekhar mass when And this Quarks are formed by the condensation of plasma (And a ), then black holes of the order of 30 solar masses (such as those initially discovered with and whose existence is poorly explained by collapsing stars) when lions always form and finally black holes of the order of a million solar masses when And this annihilate each other.
The large population of black holes thus formed should generate gravitational waves during the collision thatMay be exposed in the 2030s. But perhaps the most interesting discovery relates to the first stars.
This is the story of a space telescope named James Webb, designed to take over from the legendary Hubble telescope. Its space adventure begins in December 2021 at the Guiana Space Center, where it will fly aboard an Ariane 5 rocket and be placed in orbit around the Lagrange L2 point of the Earth-Sun system. This telescope includes many instruments including MIRI, which have been developed under it. Responsibility of ESA and national space agencies by a consortium of European laboratories. © CEA, CNS, CNRS, Osup
According to the researchers’ calculations, in their scenario, primordial black holes tend to cluster into a single star-likeand therefore form sort of mini halos of dark matter bathed in the mix of and d’ ,
These halos collapse and take away the distribution ofIn surrounding regions, their densities increase to the point of fission initiation and collapse into denser regions that will become protostars, processes that occur more rapidly than in classical models involving dark matter particles.
So in this scenario it was generally thought that the first stars would soon be born and since supermassive black holes would also collect matter,James Webb must see source already important during the period that is called And so watch for significant star formation earlier than expected.
radiation produced byMatter on early supermassive black holes should also be detectable, not only in the infrared but also in the domain of ,
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