From Jim Kemp
If I read Amanda Gefter’s fascinating article right, for observers outside a black hole all information about stuff that has been sucked through the event horizon is smeared across the surface of the horizon (6 March, p 28). It’s a hologram. Thus the holographic principle: that the surface of every volume, including the infinite multiverse, contains all information within the volume.
Now, although we may not be able to access the multiverse, the boundary between it and us will contain all multiverse information, so if we can access the boundary we can make predictions about the multiverse and test them, observing and interacting with information about it.
Or does this overlook a huge difference between information in black holes and in the multiverse? Everything passing into a black hole started out in our domain, but nothing in the multiverse did. Or did it?
Sonoma, California, US
