Dark matter plays an important role in the evolution of our universe, but for a long time no thought was given to how the first stars were formed. But in 2007 A theory was born About the fact that, shortly after the formation of the universe, stars could have formed that, unlike those known today, could also have contained some dark matter. these dark starIt’s hard to imagine the things being called out. Within these stars, among the ordinary matter, dark matter is also present. Dark matter particles collide and destroy each other, in the process producing energy and transferring it to normal matter, and this prevents normal matter – hydrogen and helium – from condensing as it does in conventional stars. Because of this, nuclear fusion cannot begin in dark stars, and dark stars can be huge molecular clouds, but they are very bright in many wavelength ranges. According to calculations, for example, they may have released significant gamma radiation. These dark stars could have formed 80-100 million years after the Big Bang, and they could be much larger than our Sun: they would have been 15,000 times the size of the entire solar system, 10 million times the mass of the Sun, and a billion times brighter. Based on this, it is understandable how easily they can be seen as galaxies.
The theory has now been touted again by a research team (led by Catherine Friese, who was involved in the 2007 research and is now director of the Weinberg Institute for Theoretical Physics), and the James Webb Space Telescope is in late 2022 instead. With his discovery, which raises many questions Comb it.
The early presence of detected bright objects is difficult to explain with the currently accepted cosmological theory (lambda cdm), there would simply be too many massive galaxies in the very young universe. the University of Texas Research in which these objects, which are difficult to fit into theory, have been interpreted by experts as dark stars. The study on their proposal has been done before PNAS It can be read in a magazine.
A quarter of the universe is made up of dark matter (only 5% of normal matter), but the nature of this dark matter is extremely difficult to study. According to the ideas, they can have their own particles, these are called WIMPs, that is, Weakly Interacting Massive Particles, and dark stars can exist because of their collision. If such dark stars could be detected, it would also open up the possibility of studying dark matter.
“It’s more likely that there is something in the Standard Model that needs adjusting, because introducing something as radically new as what we’re proposing is always less likely,” Dr. Freese explained. “However, if only a fraction of the objects that look like early galaxies are dark stars, then the models of galaxy evolution are indeed more similar to the observations.”
Researchers believe that three objects may be dark stars: JADES-GS-z13-0, JADES-GS-z12-0 and JADES-GS-z11-0. According to data analysis, they were discovered by the space telescope 320-400 million years after the Big Bang. These are practically the oldest objects ever discovered. Recently, another theory related to the same objects has emerged, which casts doubt on the age of the universe.
