As the BH pulls material inwards (into it), the gravitational pressure causes it to expel matter and energy out of it which we perceive as gas jets and we named them as "relativistic jets".Īstronomer Steve Allen told, (I don't know him, but looks like he's a big guy) The sound waves are just longitudinal pressure waves and hence the fate "they require medium". In your case, the gases in the Perseus cluster is good enough to serve as a medium for these very low frequency sound waves to travel through. It consists about a few hydrogen atoms per cubic meter. And that's because the central singularity is located very deep inside the BH (quite a large distance from the event horizon).Īs you say, outer space is just hard kinda vacuum and not completely vacuum. So, they're not strong enough to produce an astonishing tidal force upon the falling matter at the event horizon. They're a way too bulk in size when compared to other blackholes (Schwarzchild for example). The article specifically says a " supermassive blackhole". But after reading the article now, we could indicate some points. Light can't escape only from the inside of event horizon because it has already fallen into it. So: How can a black hole produce sound if light can't escape it?Īs the other guys have already covered most of the topic, I'd like to quote some things. Sound can't travel in space (space has too much, well, space).Black holes are so massive that light, which is faster than sound, can't escape.“These sound waves may be the key in figuring out how galaxy clusters, the largest structures in the Universe, grow.” “The Perseus sound waves are much more than just an interesting form of black hole acoustics,” says Steve Allen, of the Institute of Astronomy and a co-investigator in the research. These ripples are evidence for sound waves that have traveled hundreds of thousands of light years away from the cluster’s central black hole.
In 2002, astronomers obtained a deep Chandra observation that shows ripples in the gas filling the cluster. The black hole resides in the Perseus cluster of galaxies located 250 million light years from Earth. The tremendous amounts of energy carried by these sound waves may solve a longstanding problem in astrophysics. The “note” is the deepest ever detected from any object in our Universe. 9, 2003: Astronomers using NASA’s Chandra X-ray Observatory have found, for the first time, sound waves from a supermassive black hole. The article describes the discovery that black holes emit a "note" that has physical ramifications on the detritus around it. They couldn’t both be right, so most physicists assumed that Hawking had erred somehow.I was reading this article from NASA - it's NASA - and literally found myself perplexed. His work suggested two conflicting conclusions: that black holes evaporate (implying that radiation should eventually carry away the information), and that the radiation does not carry information.
The final piece of the paradox was that Hawking’s analysis had found the radiation to be perfectly random - devoid of any information to decode. “But if the black hole disappears, the guys outside don’t have any definite states at all.”. “It’s fine as long as that stuff is inside somewhere,” said Samir Mathur, a physicist at Ohio State University and one of the coordinators of the 2013 conference. The qubits of information inside the black hole, which record the life of the black hole and all that has fallen into it, seemingly disappear - a preposterous development.
BLACKHOLE AUDIO WIKI FULL
But because each exterior partner shares one bit with its interior partner, the Hawking radiation alone makes as little sense as a piggy bank full of one-sided coins. After untold eons, only the cloud of radiation remains. As the black hole radiates particles, it eventually evaporates away completely. That appears to conflict with a second consequence of Hawking’s calculation. The trouble began with the fact that under the terms of quantum mechanics, each duo is linked by entanglement, meaning that the two particles jointly carry one unit of information. Over time, the partners pile up both inside the black hole and outside, where they take flight in an expanding cloud of “Hawking radiation.” One partner falls into the black hole while the other escapes. >In 1974, Hawking calculated that around the event horizon - the sphere of no return surrounding a black hole - quantum fluctuations create pairs of particles. Click to expand.If Hawking was correct, you and the Hotel California would eventually turn into random radiation containing no information:
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