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Imagine a black hole with the mass of the asteroid Ceres. It would be no larger than a bacterium and practically undetectable. But if such black holes are common in the Universe, they would affect the motions of stars and galaxies, just as we observe. Perhaps they are the source of dark matter.
Such tiny black holes could not form from dying stars, but they might have formed within the hot, dense cosmos soon after the Big Bang. For this reason, they are known as primordial black holes. We have no evidence they exist, but since they would be such a great explanation for dark matter, astronomers keep looking.. Large, almost stellar mass black holes would affect the clustering of galaxies in a way we don’t observe.
The frequency of these primordial chirps would be too high for current observatories such as LIGO to observe, but the authors point out that some current dark matter experiments might be able to observe them. One alternative model for dark matter involves a. Axions were originally proposed to solve some issues in high-energy particle physics, and while they have fallen out of popularity in particle physics, they’ve gained some popularity in cosmology.
The chances of success are pretty slim. It would be odd for primordial black holes to exist in the only allowed mass range and nowhere else, and the conditions we could observe would be pretty narrow. But it might be worth doing a search on the off chance. The nature of dark matter remains a huge mystery in astronomy, so we don’t have much to lose in trying the occasional long-shot idea.
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