Black holes might be more complex than scientists have thought, according to a new study, which suggests for the first time that these mysterious objects might be exerting pressure on their environment.
Known for their extremely powerful gravitational force that sucks in everything from their vicinity, black holes were originally believed to be completely inert. In 1974, famous cosmologist Stephen Hawking discovered that these superdense objects are in fact emitting thermal radiation. A new discovery, made by a team of scientists from the University of Sussex, U.K., now hints at an even more complex nature of these massive space drains.
Astronomers Xavier Calmet and Folkert Kuipers concluded that black holes exert pressure as they studied the changes in gravitational forces caused by the behavior of quantum particles at the edge of black holes and the entropy, or the available energy, of that system
Related: Watch a supermassive black hole fest in mesmerizing new simulation (video)
As they ran their calculations over and over again, an extra figure was showing up that they had no explanation for. Eventually, they concluded this unaccounted variable must represent pressure.
"Our finding that Schwarzschild black holes [static black holes without electric charge and angular momentum] have a pressure as well as a temperature is even more exciting given that it was a total surprise," Xavier Calmet, Professor of Physics at the University of Sussex, and one of the authors of the new study, said in a statement. "I'm delighted that the research that we are undertaking at the University of Sussex into quantum gravity has furthered the scientific communities' wider understanding of the nature of black holes."
The pressure exerted by the black hole, Calmet said, is rather tiny. Still, its existence might help scientists improve their understanding of the behaviour of black holes and how they marry the rather incongruous principles of quantum mechanics, thermodynamics and gravity.
"If you consider black holes within only general relativity, one can show that they have a singularity in their centres where the laws of physics as we know them must break down," Calmet said. "It is hoped that when quantum field theory is incorporated into general relativity, we might be able to find a new description of black holes."
Folkert Kuipers, a doctoral researcher in the school of Mathematical and Physical Science at the University of Sussex and the second author of the paper, added: "It is exciting to work on a discovery that furthers our understanding of black holes."Our result is a consequence of the cutting-edge research that we are undertaking into quantum physics at the University of Sussex and it shines a new light on the quantum nature of black holes."
The discovery is described in a paper published in the journal Physical Review D on Sept. 10.
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Surprise discovery suggests that black holes are more complex than thought - Space.com
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