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Black holes gain new powers when they spin fast enough 5nvklj





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Black holes gain new powers when they spin fast enough

Dragon
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Black holes gain new powers when they spin fast enough Empty Black holes gain new powers when they spin fast enough

Post by Dragon Wed Dec 23, 2020 10:34 pm

General relativity is a profoundly complex mathematical theory, but its description of black holes is amazingly simple. A stable black hole can be described by just three properties: its mass, its electric charge and its rotation or spin.

Since black holes aren't likely to have much charge, it really takes just two properties. If you know a black hole's mass and spin, you know all there is to know about the black hole.

Mass is mass as far as general relativity is concerned. In every case, the event horizon of a black hole is perfectly smooth, with no extra features. As Jacob Bekenstein said, "black holes have no hair."

But with all its predictive power, general relativity has a problem with quantum theory. This is particularly true with black holes. If the no-hair theorem is correct, the information within an object is destroyed when it crosses the event horizon.

Quantum theory says that information can never be destroyed. So the valid theory of gravity is contradicted by the valid theory of the quanta. This leads to problems such as the firewall paradox, which can't decide whether an event horizon should be hot or cold.

Continued...
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Black holes gain new powers when they spin fast enough 334pu7m
Dragon
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Black holes gain new powers when they spin fast enough Empty Re: Black holes gain new powers when they spin fast enough

Post by Dragon Wed Dec 23, 2020 10:36 pm

Black holes gain new powers when they spin fast enough Blackholesga
Credit: Jeremy Perkins / Unsplash

The conflict between relativity and quantum theory leads to the firewall paradox.

Source / Image Courtesy


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Black holes gain new powers when they spin fast enough 334pu7m
Dragon
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Black holes gain new powers when they spin fast enough Empty Re: Black holes gain new powers when they spin fast enough

Post by Dragon Wed Dec 23, 2020 10:39 pm



This animation shows a spinning black hole and its surrounding accretion disk.


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Black holes gain new powers when they spin fast enough 334pu7m
Dragon
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Black holes gain new powers when they spin fast enough Empty Re: Black holes gain new powers when they spin fast enough

Post by Dragon Wed Dec 23, 2020 10:43 pm



For the first time, NASA’s planet-hunting Transiting Exoplanet Survey Satellite (TESS) watched a black hole tear apart a star from start to finish, a cataclysmic phenomenon called a tidal disruption event.


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Black holes gain new powers when they spin fast enough 334pu7m
Dragon
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Black holes gain new powers when they spin fast enough Empty Re: Black holes gain new powers when they spin fast enough

Post by Dragon Wed Dec 23, 2020 10:45 pm



The Event Horizon Telescope Collaboration observed the supermassive black hole at the center of M87, finding the dark central shadow in accordance with General Relativity, further demonstrating the power of this 100 year-old theory.


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Black holes gain new powers when they spin fast enough 334pu7m

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