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decorative Observations of gravitational waves from merging black holes may reveal new insights about dark matter, suggests a new study from a UCL-led international team. The study, presented at the 2023 National Astronomy Meeting in Cardiff and now published in the journal Physical Review D , used computer simulations to study the production of gravitational wave signals in simulated universes with different kinds of dark matter. Their findings show that counting the number of black-hole merging events detected by the next generation of observatories could tell us whether or not dark matter interacts with other particles and therefore help pin down what it is made of. Cosmologists generally regard dark matter as one of the biggest missing pieces in our understanding of the cosmos. Despite strong evidence that dark matter makes up 85% of all the matter in the Universe, there is currently no consensus on its underlying nature. This includes questions such as whether dark matter particles can collide with other particles such as atoms or neutrinos, or whether they pass straight through them unaffected. A way to test this is by looking at how galaxies form in dense clouds of dark matter called haloes.
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