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Primordial Black Holes Could Explain Dark Matter

The Atlantic
So Much Hinges on the Existence of Ancient Black Holes
For 50 years, physicists have searched for signs of black holes that formed just after the Big Bang. If real, these massive, invisible objects could help unravel the mystery of dark matter.
NASA
One day a little more than five years ago, Ely Kovetz was having lunch with his colleagues at Johns Hopkins University, in Baltimore, discussing a tantalizing rumor. Like many in the physics community, Kovetz had heard the buzz about a possible signal from a U.S. physics observatory. The observatory was designed to pick up disturbances in the fabric of space-time, ripples created by, among other things, black holes crashing into each other. Most intriguing, the signal appeared to have been created by massive objects far heavier than anyone expected. That pointed at some eyebrow-raising possibilities. ....

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Primordial black holes could explain dark matter, galaxy growth, and more

Primordial black holes could explain dark matter, galaxy growth, and more
astronomy.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from astronomy.com Daily Mail and Mail on Sunday newspapers.

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Primordial black holes could explain dark matter, galaxy growth and more

Apr 19, 2021 3:28 PM EDT
One day a little more than five years ago, Ely Kovetz was having lunch with his colleagues at Johns Hopkins University in Baltimore, discussing a tantalizing rumor. Like many in the physics community, Kovetz had heard the buzz about a possible signal from a newly operational US physics observatory. The observatory was designed to pick up disturbances in the fabric of spacetime, ripples created by, among other things, black holes crashing into each other. Most intriguingly, the signal appeared to have been created by massive objects, far heavier than anyone expected. That pointed at some eyebrow-raising possibilities. ....

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Black holes and the multiverse could account for all dark matter - BBC Science Focus Magazine

BBC Science Focus Magazine
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In the very beginning, the Universe was incredibly hot and dense – so much so that a random local fluctuation that increased the density of an area by only 50 per cent would be enough to spark gravitational collapse into a black hole. Unlike the black holes we see in our modern Universe, the hypothetical ‘primordial’ black holes created at this time didn’t form from a collapsing star, which means they could have a wide range of masses, including very small ones.
Since they can be tiny and give out no light, primordial black holes are a potential candidate for dark matter, the mysterious material that makes up about 85 per cent of all matter in the Universe and can’t be seen through telescopes. ....

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Wombling, boojums and thunk: Test yourself in our jargon-busting quiz

B In genomics, a discontinuity in a base sequence that disrupts replication
C In chemistry, a sudden, unexpected reflux through a distillation condenser

6 MACHOs
B Massive Astrophysical Compact Halo Objects, a possible identity for dark matter
C Molecular Anionic Compounds with Hydrophobic Oxygen Species, a common ingredient of soaps and face creams
....

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