Simulations indicate that the GW190521 merger was the result of non-rotating black holes randomly discovering each other.


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A team of researchers from Friedrich-Schiller-Universität Jena, University of Turin and INFN sezione di Torino has found evidence that the black hole collision that led to the detection of a strange gravitational wave in 2019 was due to a unique set of circumstances. In their paper published in the journal natural astronomy The group describes modeling and simulating the conditions that can lead to the unique gravitational wave signature.


The development of gravitational wave detectors has led to a better understanding of what is happening and when black holes Collide. In most cases, the data has shown that it is caused by: Binary stars They explode and then slowly spiral towards each other until they meet at the center of gravity and merge.

But then, on May 21, 2019, gravitational waves It was detected from the merger of two black holes, but the data showed that none of the black holes appeared to be spinning and the duration of the signal was shorter than that of all the others detected. The strange signal has left astrophysicists scratching their heads. Now, in this new effort, the researchers believe they’ve come up with a plausible explanation for the observation.

After modeling all data from Gravitational wave detectorsThe researchers adjusted the characteristics until the model established the type of signals that were observed. He showed that not only were the black holes larger than average, but they were not part of a binary system. This indicates that rather than originating as a binary system, the two black holes were single objects, each moving randomly through space. By chance, they crossed paths closely enough to bring each other closer, then collide. For this scenario to unfold, the black holes likely belong to a group of black holes, which increases the chances of random encounters.

The final simulation showed two black holes approaching and then passing close to each other, causing both to deviate dramatically, drawing them back together until they collided with each other—the result, the researchers concluded, is dynamic capture.

more information:
R. Gamba et al, GW190521 as a dynamic capture of two non-rotating black holes, natural astronomy (2022). DOI: 10.1038/s41550-022-01813-w

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the quote: Simulations indicate that the GW190521 merger was the result of non-rotating black holes randomly finding each other (2022, November 18) Retrieved November 19, 2022 from https://phys.org/news/2022-11-simulations-gw190521 -merger-result -non-spinning.html

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