Image: The Guardian

Black holes store information as holograms at the event horizon, says Stephen Hawking

Nothing can escape a black hole, not even light, any scientists schooled in modern physics will tell you. Eminent British physicists, Stephen Hawking, suggests however that information is still retained at the boundary of black holes, known as the event horizon — an amazing new black hole fact!

Image: The Guardian

Image: The Guardian

Quantum mechanics dictates that anything – that is, matter and energy – can be broken down into information, strings of 1s and 0s for instance. A consequence of this rule is that information should never disappear, not even if the matter or energy it’s linked to is being sucked by a black hole. This hypothesis, however, contradicts Einstein’s theory of general relativity which suggests the information should be destroyed by a black hole. This is the information paradox, as physicists call it.

Hawking says that the information isn’t destroyed by a black hole because it never makes through inside. Instead, it’s trapped at the event horizon – the boundary in spacetime through which matter and light can only pass inward towards the mass of the black hole. At this boundary layer, the information is stored as a 2D hologram or super translation. A hologram is a 2D description of a 3D object.

“The idea is the super translations are a hologram of the ingoing particles,” Hawking explained.

“Thus, they contain all the information that would otherwise be lost.”

Some physicists believe we’re actually living in a holographic universe. Not that everything you see and touch isn’t real, like say in the Matrix. Rather, what we’re currently registering is a projection of a 2D Universe. Imagine watching TV – what seems like 3D objects projected on the screen are actually flat. It might sound crazy (because it’s counter-intuitive to our innate sensing abilities), but when physicists do their work assuming a 2D universe, the laws of physics make more sense. For instance, paradoxes like the information loss problem or entropy problem can be solved.

It’s not clear even that matter is being sucked by the black hole, either. The matter might also be transformed into a hologram, though there’s no consensus on this.

“Nobody really understands the details of how this happens – this is what Hawking is trying to work out and what other related ideas ‘fuzzball’ and ‘firewall’ explore too,” Prof Marika Taylor, a theoretical physicist at the University of Southampton, told BBC News.

If the information can be stored, can it be read? Theoretically, if you could tap this information somehow you would be able to reconstruct all the events that caused matter to plunge into the black hole. Think of a black hole as a paper shredder; documents are ripped to pieces and become unreadable, but if put all the paper strings together it’ll make sense. In the 1970s, the same Hawking introduced the concept of Hawking radiation – photons emitted by the black hole itself due to quantum fluctuations. Initially, Hawking thought the photons carried no meaningful information but has since changed his mind. This Hawking radiation might be a means for information to escape the black hole. The downside is that it’s in a “chaotic, useless form,” says Hawking, adding: “for all practical purposes the information is lost.”

For now, details are sketchy. Hawking and collaborators will publish a paper at the end of the month expanding on the subject.

“The message of this lecture is that black holes ain’t as black as they are painted. They are not the eternal prisons they were once thought,” Hawking said during a public lecture on Monday held in Stockholm. “Things can get out of a black hole both on the outside and possibly come out in another universe.”

8 thoughts on “Black holes store information as holograms at the event horizon, says Stephen Hawking

  1. Brian Donovan

    Still trying to save the “information is never lost” rule. Think about encryption. If you encrypt the information with a strong encryption and throw away the key that information is gone. .Or how about resolution? There are quantum limits to information storage. Information is lost and losses resolution.

  2. samidge

    I came to the same conclusion. The information would become spread across the horizon though. How a black hole creates a gravitational well is a paradox as the object entering is imprinted on the surface yet also exists within the black hole.

  3. Pingback: Black holes store information as holograms at the event horizon | Event Technology Portal

  4. Plancked

    @Brian Donovan If you lose the key for an encrypted data, the information is not lost, just not coherently readable. The encrypted data is still there and the key, that you threw away still exists in that same data set.
    You're confusing "losing access to content" with "losing information".

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