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Weird World of Quantum Black Holes – "May Be Radically Different from What Einstein Predicted and Lack Event Horizons"


 
“According to Einstein’s Theory of General Relativity, nothing can escape from the gravity of a black hole once it has passed a point of no return, known as the event horizon,” explained Niayesh Afshordi, a physics and astronomy professor at Waterloo in 2020 about echoes in gravitational wave signals that hint that the event horizon of a black hole may be more complicated than scientists currently think based on research reporting the first tentative detection of these echoes, caused by a microscopic quantum “fuzz” that surrounds newly formed black holes.
Hawking Radiation
 “This was scientists’ understanding for a long time until Stephen Hawking used quantum mechanics to predict that quantum particles will slowly leak out of black holes, which we now call Hawking radiation,” wrote Afshordi, referring to Hawking’s 1974 conjecture that if one takes quantum theory into account, it seems that “black” holes should glow slightly with “Hawking rad ....

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What are Gravitational Waves?


What are Gravitational Waves?
Not only do gravitational waves represent the ultimate confirmation of the theory of General Relativity, they will provide us with a new way to see the cosmos. But what are these ripples in spacetime and where do they come from?
Whilst it may not have the snappiest name, the event
GW150914 is pretty significant in terms of our understanding of the Universe. This event, with a name that includes ‘GW’ as a prefix which is an abbreviation of ‘Gravitational Wave’ and the date of observation–15/09/14– marked humanity’s first direct detection of gravitational waves.
This was groundbreaking on two fronts; firstly it successfully confirmed a prediction made by Albert Einstein’s theory of general relativity almost a century before. A prediction that stated events occurring in the Universe do not just warp spacetime, but in certain cases, can actually send ripples through this cosmic fabric. ....

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