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Dark matter and energy

Dark matter and energy

Primordial black holes contain very little dark matter, say astronomers

23 Jul 2024 Isabelle Dumé
Artist's impression of a microlensing event caused by a black hole observed from Earth toward the Large Magellanic Cloud
Bending light: Artist's impression of a microlensing event caused by a black hole observed from Earth toward the Large Magellanic Cloud (LMC). The light of a background star located in the LMC is bent by a putative primordial black hole (lens) in the Galactic halo and magnified when observed from the Earth. Microlensing causes very characteristic variation of brightness of the background star, enabling the determination of the lens's mass and distance. (Courtesy: J. Skowron / OGLE. Background image of the Large Magellanic Cloud: generated with bsrender written by Kevin Loch, using the ESA/Gaia database)
When the gravitational wave detectors LIGO and VIRGO observed signals from merging black holes with

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Isabelle Dumé is a contributing editor to Physics World
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