Step by step since 1974, Stephen Hawking discovered that black holes must emit heat or Hawking radiation. In other words, they have a temperature. From the equations of quantum gravity corrections, the entropy of black holes has now sprung up another, quite astonishing feature of the scientist. Black holes also appear to have pressure.
Black hole. Credit: CC0 Public Domain.
Black holes, ie objects with completely collapsed matter, inside of which (obviously) there is an unpredictable peculiarity, have long been considered completely indifferent to the environment. The recently deceased Stephen Hawking estimated in 1974 that black holes emit thermal radiation. But with Hawking radiation, the list is practically over.
Xavier Calme. Credit: University of Sussex.
Physicists from the British University of Sussex are making a groundbreaking discovery that black holes also put pressure on their environment. They found that black holes must be significantly more complex thermodynamic systems than we think. Xavier Calmet and Folkert Kuipers made a happy discovery. They were struck by a strange result in solving the equations for quantum gravity corrections of the black hole entropy with which they played. When further analyzed, it turned out that quantum gravity could lead to the formation of pressure through the black holes.
Logo. Credit: University of Sussex.
According to Calmet, when it turned out that the black holes had not only temperature but also pressure, it was a complete surprise to them. It also commends the great success of quantum gravity research at the University of Sussex, which offers a new perspective on the quantum nature of black holes. According to Calmet, black holes could now become notable space labs for research into the relationship between quantum mechanics, gravity and thermodynamics.
Calmet hopes their research will open up new possibilities in astrophysics as well as particle physics and quantum physics. It was a valuable professional experience for the Kuipers. The moment when, after months of effort, they discovered that the mysterious result of their equations really said that the black holes studied were exerting pressure, it is said that there is no price.
Video: Quantum gravity and dark matter together? – Folkert Kuipers -Sussex U.
University of Sussex 10. 9. 2021.
Physical Review D 104: 066012.