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Pac-Man-like behaviour could explain how massive, spinning black holes merge
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  • Pac-Man-like behaviour could explain how massive, spinning black holes merge

Pac-Man-like behaviour could explain how massive, spinning black holes merge

Press Trust of India • November 13, 2019, 09:05:52 IST
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Researchers are hoping to find signs of large, spinning black holes that can help in the hunt for gravitational waves.

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Pac-Man-like behaviour could explain how massive, spinning black holes merge

In a first, researchers have created simulations explaining how the largest of black hole mergers may have happened, showing one may have devoured another “in a ‘Pac-Man-like’ behaviour”. The researchers, including those from Rochester Institute of Technology in the US, said the disturbances in space from 10 black hole mergers have been detected so far as gravitational waves by observatories on the Earth, but the origins of these mergers still remain to be explained. The largest black hole merger observed to date defied previous models since it had a higher spin and mass than the range thought possible, they said. The current study, published in the journal Physical Review Letters, noted that such large mergers could happen just outside supermassive black holes at the centre of active galaxies. [caption id=“attachment_7413181” align=“alignnone” width=“1280”]A concept artwork of 3 black holes. Image: Flickr NASA Goddard Jordan Pearson Concept artwork of 3 black holes in a merger. Image: Flickr NASA Goddard Jordan Pearson[/caption] According to the researchers, gas, stars, dust, and black holes may get caught in a region surrounding supermassive black holes known as an accretion disk. As black holes circle around in the accretion disk, they may eventually collide and merge to form a bigger black hole, which may continue to devour smaller black holes, becoming increasingly large in a “Pac-Man-like” behaviour, according to study co-author Richard O’Shaughnessy from Rochester Institute of Technology. “It offers a natural way to explain high mass, high spin binary black hole mergers and to produce binaries in parts of parameter space that the other models cannot populate. There is no way to get certain types of black holes out of these other formation channels,” O’Shaughnessy said. The researchers hope to find signatures of large, spinning black holes that could help confirm their models as labs across the world continue to hunt for gravitational waves. “This could be a unique way of probing the physics around these supermassive black holes in a way that could not be probed in any other way,” said O’Shaughnessy. “It offers unique insight into how the centres of galaxies grow, which is of course essential to understanding how galaxies as a whole grow, which explains most of the structure in the universe,” he said

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Galaxy Astronomy Milky Way Black holes universe astrophysics Gravitational waves SciTech
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