Stephen Hawking was right about black holes 'evaporating,' strange new study shows - NBCNewsMACH
to model the event horizon of a black hole, the invisible boundary beyond which nothing can escape. In a flowing stream of this gas, they placed a cliff, creating a"waterfall" of gas; when the gas flowed over the waterfall, it turned enoughInstead of matter and antimatter particles, the researchers used pairs of phonons, or quantum sound waves, in the gas flow.
"It's like if you were trying to swim against a current that was going faster than you could swim," Steinhauer told Live Science."You'd feel like you were going forward, but you were really going back. And that's analogous to a photon in a black hole trying to get out of the black hole but being pulled by gravity the wrong way."spectrum of wavelengths
and energies. He also said that it could be described by a single temperature that was dependent only on the mass of the black hole. The recent experiment confirmed both of these predictions in the sonic black hole. "These experiments are a tour de force," Renaud Parentani, a theoretical physicist at Laboratoire de Physique Théorique of Paris-Sud University, told Live Science. Parentani also studies analog black holes but from a theoretical angle; he was not involved in the new study."It's a very precise experiment. From the experimental side, Jeff [Steinhauer] is really, at the moment, the world-leading expert of using cold atoms to probe black hole physics.
Parentani, however, emphasized that this study is"one step along a long process." In particular, this study did not show the phonon pairs being correlated on the quantum level, which is another important aspect of Hawking's predictions.
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