What Is the Black Hole Information Paradox?
Have you heard that black holes destroy any information that goes into them? Why is this such a big problem for physics?
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Team:
Fraser Cain - @fcain
Jason Harmer - @jasoncharmer
Susie Murph - @susiemmurph
Brian Koberlein - @briankoberlein
Chad Weber - weber.chad@gmail.com
Kevin Gill - @kevinmgill
Created by: Fraser Cain and Jason Harmer
Edited by: Chad Weber
Music:
Left Spine Down - “
X-Ray”
https://www.youtube.com/watch?v=4tcoZNrSveE&feature;=youtu.be
In my day, things were simple.
Robot dogs had wheels and laser noses.
School was uphill both ways.
Unwanted children removed themselves from lawns, and we didn’t need those horrible electrified tentacle arms. The cut of my jib was completely beyond reproach.
Nathan Fillion was the captain of the
Serenity all day, every day. … And black holes were holes that were black. By that I mean black holes would compress matter and energy into an infinitely dense singularity, and didn’t create a seemingly insurmountable information paradox.
Yep, those were the good ol’ days.
But those days are over. Now it’s all 50 shades of grey, with the laws of physics bending under other laws of physics. “Hashtag not my
Christian”. What I’m talking about is the black
hole information paradox.
First, let’s talk information. When physicists talk information, they’re on about the specific state of every single particle in the
Universe: mass, position, spin, temperature, you name it. The fingerprint that uniquely identifies each one, and the probabilities for what they’re going to do in the Universe. You can change atoms, crush them together, but the quantum wave
function that describes them must always be preserved.
Quantum physics allows you to run the whole Universe forwards and backwards, as long as you reverse everything in your math: charge, parity and time. Here’s the important part. The big brains tell us information must live on, no matter what.
Think about it like energy. You can’t destroy energy, all you can do is transform it.
Now, the black hole recap.
Naturally formed when the largest stars, those with more than 20 times the mass of the Sun, collapse violently and explode. Here the density of matter is so high, the escape velocity exceeds the speed of light. The fancy ones have a super-heated accretion disk of matter swirling around the black hole event horizon, where even light can be pulled into orbit.
Here, we get one of the strangest side effects from
Relativity: time dilation.
Imagine a clock falling towards a black hole, moving deeper into the gravity well. It would appear to slow as it got closer to the black hole, and eventually freeze at the edge of the event horizon. Photons from the clock would stretch out, and the color of the clock would redshift.
Eventually, it fades away as the photons stretched out beyond what our eyes can detect.
If you could stare at the black hole for billions of years, you would see everything it ever collected, stuck to the outside like flypaper. You could
point out the clock, the
Titanic, the
Ranger, and
USS Cygnus, and theoretically, you could identify the quantum state of every single particle and photon that went into the black hole. Since they’re going to take an infinite length of time to disappear completely, everything’s fine.
Their information is preserved forever on the surface of the black hole. They’re all totally dead, but their information, their precious precious quantum information, is totally safe.
If you could unravel a black hole, you could get at all the quantum information describing everything the black hole ever consumed. And least, that’s how it was in the good old days.
But in
1975,
Hawking dropped a bombshell. He realized black holes have a temperature, over vast periods of time, they would evaporate away until there was nothing left. releasing their mass and energy back into the
Universe. Unsurprisingly known as Hawking Radiation.