Janna Levin

So all of this, like space-time looks nice and smooth and continuous, but if I look at the quantum realm, I'll see everything sewn together out of quantum threads. And that space-time is not a smooth continuum all the way down. Now, people already thought that, but they thought it kind of came in chunks of space-time. Instead, maybe it's just quantum mechanics all the way down.

But when you zoom in a lot... When you zoom in a lot to the quantum mechanical scale at which you're seeing the Hawking radiation, you would be noticing that there's some entanglement between the radiation that I could not explain before and the interior of the black hole. So it's now no longer a perfectly...

But when you zoom in a lot... When you zoom in a lot to the quantum mechanical scale at which you're seeing the Hawking radiation, you would be noticing that there's some entanglement between the radiation that I could not explain before and the interior of the black hole. So it's now no longer a perfectly...

But when you zoom in a lot... When you zoom in a lot to the quantum mechanical scale at which you're seeing the Hawking radiation, you would be noticing that there's some entanglement between the radiation that I could not explain before and the interior of the black hole. So it's now no longer a perfectly...

thermal spectrum with no features that only depends on the mass, it actually has a way to have an imprint of the information interior to the black hole. in the particles that escape.

thermal spectrum with no features that only depends on the mass, it actually has a way to have an imprint of the information interior to the black hole. in the particles that escape.

thermal spectrum with no features that only depends on the mass, it actually has a way to have an imprint of the information interior to the black hole. in the particles that escape.

And so now, in principle, I could sit there for a very long time, it might take longer than the age of the universe, and collect all the Hawking radiation and see that it actually had details in it that are going to explain to me what was interior to the black hole so the information is no longer lost.

And so now, in principle, I could sit there for a very long time, it might take longer than the age of the universe, and collect all the Hawking radiation and see that it actually had details in it that are going to explain to me what was interior to the black hole so the information is no longer lost.

And so now, in principle, I could sit there for a very long time, it might take longer than the age of the universe, and collect all the Hawking radiation and see that it actually had details in it that are going to explain to me what was interior to the black hole so the information is no longer lost.

Now, I can't do that any more than I can recover the words on that piece of paper once it's been burnt. But that's a practical limitation, not a fundamental one. It's just too hard. But when I burn a piece of paper, technically, the information is all there somewhere. It's in the smoke. It's in the currents. It's in the molecules. It's in the ink molecules. But in principle, if I had...

Now, I can't do that any more than I can recover the words on that piece of paper once it's been burnt. But that's a practical limitation, not a fundamental one. It's just too hard. But when I burn a piece of paper, technically, the information is all there somewhere. It's in the smoke. It's in the currents. It's in the molecules. It's in the ink molecules. But in principle, if I had...

Now, I can't do that any more than I can recover the words on that piece of paper once it's been burnt. But that's a practical limitation, not a fundamental one. It's just too hard. But when I burn a piece of paper, technically, the information is all there somewhere. It's in the smoke. It's in the currents. It's in the molecules. It's in the ink molecules. But in principle, if I had...

took the age of the universe, I should be able to, in principle, reconstruct the piece of paper and all the words on it.

took the age of the universe, I should be able to, in principle, reconstruct the piece of paper and all the words on it.

took the age of the universe, I should be able to, in principle, reconstruct the piece of paper and all the words on it.

Yeah, we're skirting around it. I think that this is the way to find that out. It's going to be on the train of black holes that we figure out if that's possible. I think that this is suggesting that there might not be a theory of quantum gravity, that gravity will emerge at a macroscopic level out of quantum phenomena. Now, we don't know how to do that yet.

Yeah, we're skirting around it. I think that this is the way to find that out. It's going to be on the train of black holes that we figure out if that's possible. I think that this is suggesting that there might not be a theory of quantum gravity, that gravity will emerge at a macroscopic level out of quantum phenomena. Now, we don't know how to do that yet.

Yeah, we're skirting around it. I think that this is the way to find that out. It's going to be on the train of black holes that we figure out if that's possible. I think that this is suggesting that there might not be a theory of quantum gravity, that gravity will emerge at a macroscopic level out of quantum phenomena. Now, we don't know how to do that yet.

There are examples of emergent phenomena which are very simple and clean. Like I can just take electromagnetic scattering, which is law of physics where particles scatter just by electromagnetically. And I have a lot of them and I have a lot of them in this room and they come to some average. Well, I call that temperature.